0001133421-26-000027 | 11-K | XBRL Viewer

INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS	12 Months Ended
INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS	Dec. 31, 2025
EBP, NGSP
EBP, Master Trust [Line Items]
INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS	5. INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS Synthetic guaranteed investment contracts consist of fully benefit-responsive wrapper contracts that provide specified interest rates. Realized and unrealized gains and losses on the underlying assets are not reflected immediately in the net assets of the Plan, but are amortized as adjustments to the future interest-crediting rate over a period equal to or less than the duration of the underlying assets. Primary variables affecting the future crediting rate of the wrapper contracts include the current yield of underlying assets, the duration of underlying assets, and the difference between the market value and contract value of underlying assets. Investments held in synthetic guaranteed investment contracts (at contract value) totaled $3.1 billion and $3.2 billion as of December 31, 2025 and 2024, respectively. Certain events, such as Plan termination or a plan merger initiated by the Plan sponsor, may limit the ability of the Plan to transact at contract value or may allow for the termination of the wrapper contract at less than contract value. Plan management believes that the occurrence of events that may limit the ability of the Plan to transact at less than contract value is not probable.

- Definition

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+ References

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+ Details

THIRD PARTY BORROWINGS (Details) - EBP, NGSP - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Debt [Line Items]
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	$ 499,692	$ 485,181
Synthetic guaranteed investment contracts
EBP, Debt [Line Items]
Underlying securities of synthetic guaranteed investment contracts	$ 195,889	679,519
U.S. Securities
EBP, Debt [Line Items]
Initial collateral	102.00%
Foreign
EBP, Debt [Line Items]
Initial collateral	105.00%
EBP, Cash Collateral
EBP, Debt [Line Items]
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	$ 167,000	603,000
EBP, Non-Cash Collateral
EBP, Debt [Line Items]
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	$ 33,000	$ 91,000

EXEMPT PARTY-IN-INTEREST TRANSACTIONS	12 Months Ended
EXEMPT PARTY-IN-INTEREST TRANSACTIONS	Dec. 31, 2025
EBP, NGSP
EBP, Master Trust [Line Items]
EXEMPT PARTY-IN-INTEREST TRANSACTIONS	7. EXEMPT PARTY-IN-INTEREST TRANSACTIONS Party-in-interest transactions through the DC Master Trust include the purchase and sale of investments managed by affiliates of the Plan's Trustee and transactions involving Northrop Grumman Corporation common stock. The NG Stock Fund within the DC Master Trust held 7.1 million and 7.7 million shares of common stock of the Company with a fair value of $$4.0 billion and $$3.6 billion at December 31, 2025 and 2024, respectively. The Plan’s interest in the net assets of the NG Stock Fund was approximately 0.4 percent and 0.5 percent at December 31, 2025 and 2024, respectively. During 2025, the NG Stock Fund earned dividends of $$66 million from its investment in Northrop Grumman Corporation common stock. State Street affiliates managed $0.1 million and $2.1 million of Plan assets held in the short-term investment fund as of December 31, 2025 and 2024, respectively. The Plan paid $5 thousand to the Trustee in fees during the year ended December 31, 2025. The DC Master Trust utilized various investment managers to manage its net assets. These net assets may be invested into funds also managed by the investment managers. Therefore, these transactions qualify as party-in-interest transactions. The Plan had transactions with the Trustee’s short-term investment fund, a liquidity pooled fund in which participation commences and terminates on a daily basis. In Plan management’s opinion, fees paid during the year for services rendered by parties-in-interest were based upon customary and reasonable rates for such services. The Plan also issues loans to participants, which are secured by the vested balances in the participants' accounts

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS (Details) - EBP, NGSP - Master Trust Balances - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Investment, contract value	$ 3,052,155	$ 3,161,481
Synthetic guaranteed investment contracts
EBP, Master Trust [Line Items]
Investment, contract value	$ 3,052,155	$ 3,161,481

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2025

EBP, NGSP

EBP, Investment, Fair Value and NAV [Line Items]

EBP, Investment, Fair Value and NAV

The table below sets forth the fair value of the investments by level, measured on a recurring basis and held by the DC Master Trust as of December 31, 2025:


	2025
$ in thousands	Level 1		Level 2		Total
DC Master Trust at fair value
Cash equivalents and short-term investment fund	$	—	$	78,177	$	78,177
U.S. equities	4,048,009		—		4,048,009
Collateral held under securities lending agreements	—		200,064		200,064
Common/collective trust funds valued using NAV as a practical expedient					32,627,651
Total DC Master Trust at fair value	$	4,048,009	$	278,241	$	36,953,901

The table below sets forth the fair value of the short-term investment fund, by level, measured on a recurring basis, and held by the Plan as of December 31, 2025:


	2025
$ in thousands	Level 1		Level 2		Total
State Street Bank and Trust Company short-term investment fund	$	—	$	85	$	85

The table below sets forth the fair value of the investments by level, measured on a recurring basis and held by the DC Master Trust as of December 31, 2024:


	2024
$ in thousands	Level 1		Level 2		Total
DC Master Trust at fair value
Cash equivalents and short-term investment fund	$	18	$	93,041	$	93,059
U.S. equities	3,594,037		—		3,594,037
Collateral held under securities lending agreements	—		693,505		693,505
Common/collective trust funds valued using NAV as a practical expedient					28,679,632
Total DC Master Trust at fair value	$	3,594,055	$	786,546	$	33,060,233

The table below sets forth the fair value of the short-term investment fund, by level, measured on a recurring basis, and held by the Plan as of December 31, 2024:


	2024
$ in thousands	Level 1		Level 2		Total
State Street Bank and Trust Company short-term investment fund	$	—	$	2,109	$	2,109

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

+ Details

Investments (Tables)

12 Months Ended

Dec. 31, 2025

EBP, NGSP

EBP, Master Trust [Line Items]

EBP, Master Trust

The net assets of the DC Master Trust and the Plan's interest in Master Trust balances as of December 31, 2025 and 2024, are as follows:


	Master Trust Balances				Plan's Interest in Master Trust Balances

$ in thousands	2025		2024		2025		2024
Assets
At fair value:
Cash equivalents and short-term investment fund	$	78,177	$	93,059	$	1,176	$	1,379
U.S. equities	4,048,009		3,594,037		17,388		17,911
Common/collective trust funds	32,627,651		28,679,632		434,208		417,269
Collateral held under securities lending agreements	200,064		693,505		2,129		7,919
Total investments at fair value	36,953,901		33,060,233		454,901		444,478
At contract value:
Synthetic guaranteed investment contracts	3,052,155		3,161,481		46,984		48,669
Total investments at contract value	3,052,155		3,161,481		46,984		48,669
Dividends, interest, taxes and other receivables	213		284		3		3
Total assets	40,006,269		36,221,998		501,888		493,150
Liabilities
Due to broker for securities purchased and other payables	4,516		2,796		67		50
Collateral held under securities lending agreements	200,064		693,505		2,129		7,919
Total liabilities	204,580		696,301		2,196		7,969
Net assets of the DC Master Trust	$	39,801,689	$	35,525,697	$	499,692	$	485,181

Net investment income for the DC Master Trust for the plan year ended December 31, 2025, is as follows:


$ in thousands	2025
Investment income
Net appreciation in value of investments	$	5,867,005
Interest	95,113
Dividends	65,793
Other income	2,255
Investment manager fees	(3,597)
Net investment income	$	6,026,569

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Tabular disclosure of master trust arrangement in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates.

+ References + Details

FAIR VALUE MEASUREMENTS (Details) - EBP, NGSP - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	$ 499,692	$ 485,181
Total investments	85	2,109
Total
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	36,953,901	33,060,233
Total \| Cash equivalents and short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	78,177	93,059
Total \| U.S. equities
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	4,048,009	3,594,037
Total \| Collateral held under securities lending agreements
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	200,064	693,505
Total \| Common/collective trust funds
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	32,627,651	28,679,632
Total \| State Street Bank and Trust Company short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	85	2,109
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	4,048,009	3,594,055
Level 1 \| Cash equivalents and short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	0	18
Level 1 \| U.S. equities
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	4,048,009	3,594,037
Level 1 \| Collateral held under securities lending agreements
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	0	0
Level 1 \| Common/collective trust funds
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust
Level 1 \| State Street Bank and Trust Company short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	0	0
Level 2
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	278,241	786,546
Level 2 \| Cash equivalents and short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	78,177	93,041
Level 2 \| U.S. equities
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	0	0
Level 2 \| Collateral held under securities lending agreements
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust	200,064	693,505
Level 2 \| Common/collective trust funds
EBP, Investment, Fair Value and NAV [Line Items]
Plan interest in master trust
Level 2 \| State Street Bank and Trust Company short-term investment fund
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	$ 85	$ 2,109

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS (Statement) - EBP, NGSP - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investments:
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	$ 499,692	$ 485,181
Short-term investment fund-at fair value	85	2,109
Total investments	499,777	487,290
Notes receivable from participants	427	382
Total assets	500,204	487,672
Liabilities:
Accrued expenses	27	28
Net assets available for benefits	500,177	487,644
Retirement Account
Investments:
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	174,374	170,675
Short-term investment fund-at fair value	0	0
Total investments	174,374	170,675
Notes receivable from participants	0	0
Total assets	174,374	170,675
Liabilities:
Accrued expenses	8	9
Net assets available for benefits	174,366	170,666
Savings Account
Investments:
Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3)	325,318	314,506
Short-term investment fund-at fair value	85	2,109
Total investments	325,403	316,615
Notes receivable from participants	427	382
Total assets	325,830	316,997
Liabilities:
Accrued expenses	19	19
Net assets available for benefits	$ 325,811	$ 316,978

DESCRIPTION OF THE PLAN	12 Months Ended
DESCRIPTION OF THE PLAN	Dec. 31, 2025
EBP, NGSP
EBP, Description of Plan [Line Items]
DESCRIPTION OF THE PLAN	DESCRIPTION OF THE PLAN The following description of the Northrop Grumman Financial Security and Savings Program (the “Plan” or “FSSP”) provides only general information. Participants should refer to the Plan document for a more complete description of the Plan's provisions. General The Plan is a qualified defined contribution plan established for the benefit of certain employees of Northrop Grumman Corporation (the “Company” or “Plan sponsor”) acquired as part of the Company's acquisition of Litton Industries, Inc. The Plan is closed to new participants and no further contributions are permitted. The Plan's Benefit Plans Administrative and Investment Committees control and manage the operation of the Plan. State Street Bank and Trust Company (“State Street” or the “Trustee”) serves as the Trustee of the Plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). The Plan holds an interest in the Northrop Grumman Defined Contribution Plans Master Trust (the “DC Master Trust”) through the non-participant directed retirement account (“FSSP Retirement Account”) and the participant directed savings account (“FSSP Savings Account”). It also holds investments in a short-term investment fund at the Trustee. Participant Accounts Individual accounts are maintained for each Plan participant. Each participant account is credited with an allocation of any Plan earnings from the DC Master Trust. Each participant account is charged with withdrawals and an allocation of any Plan losses and administrative expenses. Allocations are based on participant units. Participants are generally entitled to the net of contributions, withdrawals and allocations. Vesting Plan participants are fully vested in the balance of their accounts. Investment Options When participants were eligible to contribute to the Plan, participants could deposit up to 4 percent of eligible compensation into their FSSP Retirement Account which was used as the basis for calculating pension benefits. Contributions into this account are invested in the Balanced Fund within the DC Master Trust. Participant contributions in excess of 4 percent of eligible compensation were deposited into their FSSP Savings Account and could be invested in one or more of the FSSP Savings Account investment options described below. The investment funds are managed by a professional investment manager appointed by Plan management. Participants may generally change their investment elections in the FSSP Savings Accounts daily. Existing account balances can also be transferred daily, subject to certain restrictions. Amounts deposited into each investment fund are used to purchase units of that fund based on unit values that are updated daily prior to any Plan transactions, including withdrawals, distributions, and transfers. The value of each participant's account is dependent upon the number of units purchased to date and the current value of each unit. U.S. Equity Fund —The U.S. Equity Fund primarily consists of holdings in large and medium-sized U.S. company stocks. The fund’s objective is to achieve a high total return through long-term growth of capital and the reinvestment of current income. U.S. Fixed-Income Fund — The U.S. Fixed-Income Fund primarily consists of holdings in marketable, fixed-income securities rated within the four highest investment grades assigned by Moody’s Investor Services or Standard & Poor’s Corporation, U.S. Treasury or federal agency obligations, or cash equivalent instruments. The fund invests in a range of fixed-income securities that mature, on average, in eight to ten years. Stable Value Account — Investments in the Stable Value Account primarily include synthetic guaranteed investment contracts (“synthetic GICs”), cash and cash equivalents. See Note 5 for further information on synthetic GICs. Northrop Grumman Fund (“NG Stock Fund”) — The NG Stock Fund invests primarily in Northrop Grumman Corporation common stock. Balanced Fund — The Balanced Fund is designed to provide investors with a diversified portfolio consisting of targeted proportions of fixed-income securities (35 percent), U.S. equities (45 percent), and international equities (20 percent). The fund seeks to exceed the return of the bond market and approach the return of the stock market, but with less risk than an investment solely in equities. International Equity Fund — The International Equity Fund consists of stocks of a diversified group of companies in developed countries outside of the U.S. The fund’s objectives are capital appreciation over the long term, along with current income (dividends). Small Cap Fund — The Small Cap Fund consists of a diversified group of U.S. companies with lower market capitalization and higher expected revenue growth than the large, well-established companies that make up the S&P 500 Index. The fund seeks to provide capital appreciation over the long term, rather than current income. Emerging Markets Fund — The Emerging Markets Fund consists of a diversified portfolio of stocks issued by companies based in developing countries. The fund’s objective is capital appreciation over the long term. Retirement Path Portfolios — Each retirement path is a broadly diversified portfolio of funds consisting of equities, fixed-income securities and other investments tailored to the participants' investment time horizons. The name of each portfolio reflects the year when the participants expect to retire or draw interest and/or principal out of their accounts. The portfolio consists of eleven Retirement Path funds spanning to 2070. Apart from the Stable Value Account and NG Stock Fund, the large majority of the other funds are included in common/collective trust (“CCT”) funds. These funds manage pooled trust accounts, which group assets together to develop generally larger and more diversified portfolios. These funds may also include a short-term investment fund. Notes Receivable from Participants Participants may borrow from their FSSP Savings Account in accordance with the Plan document, with loans from a minimum of $1,000, up to a maximum equal to the lesser of 1) $50,000, reduced by the highest outstanding loan balance over the past 12 months, or 2) 50 percent of their vested account balances. Loans are secured by the balance in the participant's FSSP Savings Account and are issued at an interest rate set at the prime rate plus one percent. Repayments are made from payroll deductions (for active employees) or other forms of payment (for former employees or employees on a leave of absence). As of December 31, 2025, outstanding participant loans had maturities through 2030 and interest rates ranging from 4.25 percent to 9.5 percent. As of December 31, 2024, outstanding participant loans had maturities through 2029 and interest rates ranging from 4.25 percent to 9.5 percent. Payment of Benefits Upon termination of employment with the Company (including termination due to death, disability, or retirement), participants may receive a lump-sum payment of their entire FSSP Retirement and/or Savings Account balances, installment payments, or the total account balance as an annuity, net of any outstanding loan balances. In addition, participants have the option to take the total distribution as an annuity subject to Plan terms. At retirement, participants may also elect a rollover of their FSSP Retirement Account to another Company pension plan. Otherwise, distributions generally begin on a participant's mandatory commencement date. Participants may roll over account balances to individual retirement accounts or another employer's qualified retirement plan. Distributions from the NG Stock Fund will be paid in cash, stock, or a combination thereof, depending on the participant's election. Withdrawals Participants may withdraw all or a portion of their vested account balance in accordance with the Plan document, which provides for different rules for withdrawals based on whether or not the participant has reached age 591/2.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) - EBP, NGSP	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Basis of Accounting	Basis of Accounting The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ materially from those estimates.
Risks and Uncertainties	Risks and Uncertainties The Plan provides various investment options to its participants. Investment securities are exposed to various risks, including interest rate and credit risk, overall market volatility, market risks including global events such as pandemics or international conflicts, and risks related to U.S. and foreign government instability. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities may occur in the near term, and those changes could materially affect the amounts reported in the financial statements.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Plan and the DC Master Trust measure the fair value of its financial instruments using observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect internal market assumptions. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. These two types of inputs create the following fair value hierarchy: Level 1 - Quoted prices for identical instruments in active markets. Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 - Significant inputs to the valuation model are unobservable.
Investment Valuation and Income Recognition	Investment Valuation and Income Recognition The investments held by the Plan and the DC Master Trust are stated at fair value with the exception of synthetic GICs in the Stable Value Account of the DC Master Trust, which are stated at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (see Note 4). The synthetic GICs are stated at contract value because contract value is the amount that would be received by participants if they were to initiate permitted transactions under the terms of the Plan. Contract value is equal to the value of initial deposited principal, plus accumulated interest and additional deposits, minus withdrawals and expenses (see Note 5). Plan management provides direction and oversight of the valuation process. The fair value of Plan and DC Master Trust investments is determined as follows: Investments in U.S. equities, which include common stocks, are valued at the last reported sales price on the active market on which the securities are traded on the last business day of the plan year. Investments in CCT funds are valued based on the net asset value (“NAV”) derived by investment managers, as a practical expedient. The short-term investment fund is not an exchange-traded fund, however, the price per unit is published and represents the actual price at which the units held in the fund can be bought or sold. Fixed-income securities are valued based on broker quotes or model-derived valuations. All securities and cash equivalents are quoted in the local currency and then converted into U.S. dollars. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Broker commissions, transfer taxes, and other charges and expenses incurred in connection with the purchase, sale, or other disposition of securities or other investments are added to the cost of such securities or other investments, or are deducted from the proceeds of the sale or other disposition thereof, as appropriate. Taxes, if any, on fund assets, or on any gain resulting from the sale or other disposition of such assets, or on the earnings of the funds, are apportioned among the participants whose interests in the Plan are affected, and the share of such taxes apportioned to each such person is charged against their account in the Plan. The Trustee, in performing any required valuations or calculations, relies on the prices provided by pricing sources, the investment managers, Plan management or the participant’s broker as a certification as to the value. The DC Master Trust allocates investment income, realized gains and losses, and unrealized appreciation and depreciation on the underlying securities to the participating plans daily based upon the market value of each plan’s investment. The realized gain or loss on investments is the difference between the proceeds received and the average cost of investments sold. The unrealized appreciation or depreciation is the aggregate difference between the current fair market value and the cost of investments.
Notes Receivable from Participants	Notes Receivable from Participants Participant loans are measured at their unpaid principal balance plus accrued interest.
Expenses	Expenses Plan expenses are paid by the Plan or the Plan sponsor as provided in the Plan document. Fees incurred by the Plan for investment management services of $48 thousand are presented as a reduction to investment income in the Statement of Changes in Net Assets Available for Benefits for the year ended December 31, 2025.
Payment of Benefits	Payment of Benefits Benefit payments to participants are recorded upon distribution.
Tranfers	Transfers A participant may elect to transfer their vested FSSP Retirement Account balance to the Northrop Grumman Retirement Plan “B” pension plan as permitted by the Plan.

Investments (Details) - EBP, NGSP - USD ($) $ in Thousands	12 Months Ended
Investments (Details) - EBP, NGSP - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Master trust percentage	1.00%	1.00%
Investment, fair value	$ 499,777	$ 487,290
Total assets	500,204	487,672
Net assets available for benefits	500,177	487,644
Interest	71
Investment manager fees	(48)
Total investment income	73,971
Master Trust Balances
EBP, Master Trust [Line Items]
Investment, fair value	36,953,901	33,060,233
Investment, contract value	3,052,155	3,161,481
Dividends, interest, taxes and other receivables	213	284
Total assets	40,006,269	36,221,998
Due to broker for securities purchased and other payables	4,516	2,796
Collateral held under securities lending agreements	200,064	693,505
Total liabilities	204,580	696,301
Net assets available for benefits	39,801,689	35,525,697
Net appreciation in value of investments	5,867,005
Interest	95,113
Dividends	65,793
Other income	2,255
Investment manager fees	(3,597)
Total investment income	6,026,569
Master Trust Balances \| Cash equivalents and short-term investment fund
EBP, Master Trust [Line Items]
Investment, fair value	78,177	93,059
Master Trust Balances \| U.S. equities
EBP, Master Trust [Line Items]
Investment, fair value	4,048,009	3,594,037
Master Trust Balances \| Common/collective trust funds
EBP, Master Trust [Line Items]
Investment, fair value	32,627,651	28,679,632
Master Trust Balances \| Collateral held under securities lending agreements
EBP, Master Trust [Line Items]
Investment, fair value	200,064	693,505
Master Trust Balances \| Synthetic guaranteed investment contracts
EBP, Master Trust [Line Items]
Investment, contract value	3,052,155	3,161,481
Plan's Interest in Master Trust Balances
EBP, Master Trust [Line Items]
Investment, fair value	454,901	444,478
Investment, contract value	46,984	48,669
Dividends, interest, taxes and other receivables	3	3
Total assets	501,888	493,150
Due to broker for securities purchased and other payables	67	50
Collateral held under securities lending agreements	2,129	7,919
Total liabilities	2,196	7,969
Net assets available for benefits	499,692	485,181
Plan's Interest in Master Trust Balances \| Cash equivalents and short-term investment fund
EBP, Master Trust [Line Items]
Investment, fair value	1,176	1,379
Plan's Interest in Master Trust Balances \| U.S. equities
EBP, Master Trust [Line Items]
Investment, fair value	17,388	17,911
Plan's Interest in Master Trust Balances \| Common/collective trust funds
EBP, Master Trust [Line Items]
Investment, fair value	434,208	417,269
Plan's Interest in Master Trust Balances \| Collateral held under securities lending agreements
EBP, Master Trust [Line Items]
Investment, fair value	2,129	7,919
Plan's Interest in Master Trust Balances \| Synthetic guaranteed investment contracts
EBP, Master Trust [Line Items]
Investment, contract value	$ 46,984	$ 48,669

FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2025

EBP, NGSP

EBP, Investment, Fair Value and NAV [Line Items]

FAIR VALUE MEASUREMENTS

4. FAIR VALUE MEASUREMENTS

Certain investments that are measured at fair value using NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy tables. The total fair value of these investments is included in the tables below to permit reconciliation of the fair value hierarchy to amounts presented in the investments footnote (Note 3). These investments have no unfunded commitments, redemption notice periods greater than seven days or other redemption restrictions. As of December 31, 2025 and 2024, there were no investments expected to be sold at a value materially different than NAV.

The table below sets forth the fair value of the investments by level, measured on a recurring basis and held by the DC Master Trust as of December 31, 2025:


	2025
$ in thousands	Level 1		Level 2		Total
DC Master Trust at fair value
Cash equivalents and short-term investment fund	$	—	$	78,177	$	78,177
U.S. equities	4,048,009		—		4,048,009
Collateral held under securities lending agreements	—		200,064		200,064
Common/collective trust funds valued using NAV as a practical expedient					32,627,651
Total DC Master Trust at fair value	$	4,048,009	$	278,241	$	36,953,901

The table below sets forth the fair value of the short-term investment fund, by level, measured on a recurring basis, and held by the Plan as of December 31, 2025:


	2025
$ in thousands	Level 1		Level 2		Total
State Street Bank and Trust Company short-term investment fund	$	—	$	85	$	85

The table below sets forth the fair value of the investments by level, measured on a recurring basis and held by the DC Master Trust as of December 31, 2024:


	2024
$ in thousands	Level 1		Level 2		Total
DC Master Trust at fair value
Cash equivalents and short-term investment fund	$	18	$	93,041	$	93,059
U.S. equities	3,594,037		—		3,594,037
Collateral held under securities lending agreements	—		693,505		693,505
Common/collective trust funds valued using NAV as a practical expedient					28,679,632
Total DC Master Trust at fair value	$	3,594,055	$	786,546	$	33,060,233

The table below sets forth the fair value of the short-term investment fund, by level, measured on a recurring basis, and held by the Plan as of December 31, 2024:


	2024
$ in thousands	Level 1		Level 2		Total
State Street Bank and Trust Company short-term investment fund	$	—	$	2,109	$	2,109

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

The entire disclosure for fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

+ Details

INVESTMENTS

12 Months Ended

Dec. 31, 2025

EBP, NGSP

EBP, Master Trust [Line Items]

Investments

3. INVESTMENTS

The Plan's total divided interest represents 1 percent of total net assets reported by the Trustee of the DC Master Trust as of December 31, 2025 and 2024. The remaining interest in the investments held by the DC Master Trust belongs to the Northrop Grumman Savings Plan.

The net assets of the DC Master Trust and the Plan's interest in Master Trust balances as of December 31, 2025 and 2024, are as follows:


	Master Trust Balances				Plan's Interest in Master Trust Balances

$ in thousands	2025		2024		2025		2024
Assets
At fair value:
Cash equivalents and short-term investment fund	$	78,177	$	93,059	$	1,176	$	1,379
U.S. equities	4,048,009		3,594,037		17,388		17,911
Common/collective trust funds	32,627,651		28,679,632		434,208		417,269
Collateral held under securities lending agreements	200,064		693,505		2,129		7,919
Total investments at fair value	36,953,901		33,060,233		454,901		444,478
At contract value:
Synthetic guaranteed investment contracts	3,052,155		3,161,481		46,984		48,669
Total investments at contract value	3,052,155		3,161,481		46,984		48,669
Dividends, interest, taxes and other receivables	213		284		3		3
Total assets	40,006,269		36,221,998		501,888		493,150
Liabilities
Due to broker for securities purchased and other payables	4,516		2,796		67		50
Collateral held under securities lending agreements	200,064		693,505		2,129		7,919
Total liabilities	204,580		696,301		2,196		7,969
Net assets of the DC Master Trust	$	39,801,689	$	35,525,697	$	499,692	$	485,181

Net investment income for the DC Master Trust for the plan year ended December 31, 2025, is as follows:


$ in thousands	2025
Investment income
Net appreciation in value of investments	$	5,867,005
Interest	95,113
Dividends	65,793
Other income	2,255
Investment manager fees	(3,597)
Net investment income	$	6,026,569

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

The entire disclosure for master trust arrangement in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates.

+ References

+ Details

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS (Statement) - EBP, NGSP $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Investment income:
Plan interest in the Northrop Grumman Defined Contribution Plans Master Trust	$ 73,900
Interest income from short-term investment fund	71
Total investment income	73,971
Interest income on notes receivable from participants	31
Total additions	74,002
Deductions:
Benefits paid to participants	53,831
Expenses	262
Total deductions	54,093
Increase in net assets before transfers	19,909
Transfers to Northrop Grumman Retirement Plan “B”	(7,376)
Increase in net assets after transfers	12,533
Net assets available for benefits
Beginning of year	487,644
End of year	500,177
Savings Account
Investment income:
Plan interest in the Northrop Grumman Defined Contribution Plans Master Trust	46,122
Interest income from short-term investment fund	71
Total investment income	46,193
Interest income on notes receivable from participants	31
Total additions	46,224
Deductions:
Benefits paid to participants	37,228
Expenses	163
Total deductions	37,391
Increase in net assets before transfers	8,833
Transfers to Northrop Grumman Retirement Plan “B”	0
Increase in net assets after transfers	8,833
Net assets available for benefits
Beginning of year	316,978
End of year	325,811
Retirement Account
Investment income:
Plan interest in the Northrop Grumman Defined Contribution Plans Master Trust	27,778
Interest income from short-term investment fund	0
Total investment income	27,778
Interest income on notes receivable from participants	0
Total additions	27,778
Deductions:
Benefits paid to participants	16,603
Expenses	99
Total deductions	16,702
Increase in net assets before transfers	11,076
Transfers to Northrop Grumman Retirement Plan “B”	(7,376)
Increase in net assets after transfers	3,700
Net assets available for benefits
Beginning of year	170,666
End of year	$ 174,366

SCHEDULE OF ASSETS (HELD AT END OF YEAR (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]
Cost	$ 47,686
EBP, NGSP
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, current value	427
Total	$ 500,204
EBP, NGSP \| Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	4.25%	4.25%
EBP, NGSP \| Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	9.50%	9.50%
EBP, NGSP \| Investment, Identifier [Axis]: Northrop Grumman Defined Contribution Plans Master Trust \| Participation in Northrop Grumman Defined Contribution Plans Master Trust Retirement Account
EBP, Schedule of Asset Held for Investment [Line Items]
Cost	$ 47,686
Asset held for investment, plan interest in master trust, current value	174,374
EBP, NGSP \| Investment, Identifier [Axis]: Northrop Grumman Defined Contribution Plans Master Trust \| Participation in Northrop Grumman Defined Contribution Plans Master Trust Savings Account
EBP, Schedule of Asset Held for Investment [Line Items]
Asset held for investment, plan interest in master trust, current value	325,318
EBP, NGSP \| Investment, Identifier [Axis]: State Street Bank and Trust Company \| State Street Bank and Trust Company short-term investment fund
EBP, Schedule of Asset Held for Investment [Line Items]
Asset held for investment, plan interest excluding plan interest in master trust	$ 85

EXEMPT PARTY-IN-INTEREST TRANSACTIONS (Details) - EBP, NGSP - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Investment, fair value	$ 499,777	$ 487,290
Total investments	85	2,109
Payment of Trustee fees	48
Master Trust Balances
EBP, Master Trust [Line Items]
Investment, fair value	36,953,901	$ 33,060,233
Dividends	65,793
Payment of Trustee fees	$ 3,597
EBP, Employer, Common Stock
EBP, Master Trust [Line Items]
Interest in net assets	0.40%	0.50%
EBP, Employer, Common Stock \| Master Trust Balances
EBP, Master Trust [Line Items]
Investment, number of shares (in shares)	7.1	7.7
Investment, fair value	$ 4,000,000	$ 3,600,000
Dividends	66,000
Short-term investment fund—at fair value \| EBP, Trustee
EBP, Master Trust [Line Items]
Total investments	100	$ 2,100
Payment of Trustee fees	$ 5

RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 (Details) - EBP, NGSP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]
Net assets available for benefits per the financial statements	$ 500,177	$ 487,644
Less amounts allocated to withdrawing participants	(35)	(75)
Net assets available for benefits per Form 5500	500,142	487,569
Benefits paid to participants per the financial statements	53,831
Add amounts allocated to withdrawing participants at December 31, 2025	35	$ 75
Less amounts allocated to withdrawing participants at December 31, 2024	(75)
Benefits paid to participants per Form 5500	$ 53,791

- Definition

Amount of asset less liability available to pay benefit of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, aggregation of participants' individual account balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
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-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-18

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule II))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479750/962-40-25-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
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-Paragraph 1
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-03(9))
-Publisher FASB
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-2

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2025
EBP, NGSP
EBP, Accounting Policy [Line Items]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Accounting The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ materially from those estimates. Risks and Uncertainties The Plan provides various investment options to its participants. Investment securities are exposed to various risks, including interest rate and credit risk, overall market volatility, market risks including global events such as pandemics or international conflicts, and risks related to U.S. and foreign government instability. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities may occur in the near term, and those changes could materially affect the amounts reported in the financial statements. Fair Value of Financial Instruments The Plan and the DC Master Trust measure the fair value of its financial instruments using observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect internal market assumptions. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. These two types of inputs create the following fair value hierarchy: Level 1 - Quoted prices for identical instruments in active markets. Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 - Significant inputs to the valuation model are unobservable. Investment Valuation and Income Recognition The investments held by the Plan and the DC Master Trust are stated at fair value with the exception of synthetic GICs in the Stable Value Account of the DC Master Trust, which are stated at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (see Note 4). The synthetic GICs are stated at contract value because contract value is the amount that would be received by participants if they were to initiate permitted transactions under the terms of the Plan. Contract value is equal to the value of initial deposited principal, plus accumulated interest and additional deposits, minus withdrawals and expenses (see Note 5). Plan management provides direction and oversight of the valuation process. The fair value of Plan and DC Master Trust investments is determined as follows: Investments in U.S. equities, which include common stocks, are valued at the last reported sales price on the active market on which the securities are traded on the last business day of the plan year. Investments in CCT funds are valued based on the net asset value (“NAV”) derived by investment managers, as a practical expedient. The short-term investment fund is not an exchange-traded fund, however, the price per unit is published and represents the actual price at which the units held in the fund can be bought or sold. Fixed-income securities are valued based on broker quotes or model-derived valuations. All securities and cash equivalents are quoted in the local currency and then converted into U.S. dollars. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Broker commissions, transfer taxes, and other charges and expenses incurred in connection with the purchase, sale, or other disposition of securities or other investments are added to the cost of such securities or other investments, or are deducted from the proceeds of the sale or other disposition thereof, as appropriate. Taxes, if any, on fund assets, or on any gain resulting from the sale or other disposition of such assets, or on the earnings of the funds, are apportioned among the participants whose interests in the Plan are affected, and the share of such taxes apportioned to each such person is charged against their account in the Plan. The Trustee, in performing any required valuations or calculations, relies on the prices provided by pricing sources, the investment managers, Plan management or the participant’s broker as a certification as to the value. The DC Master Trust allocates investment income, realized gains and losses, and unrealized appreciation and depreciation on the underlying securities to the participating plans daily based upon the market value of each plan’s investment. The realized gain or loss on investments is the difference between the proceeds received and the average cost of investments sold. The unrealized appreciation or depreciation is the aggregate difference between the current fair market value and the cost of investments. Notes Receivable from Participants Participant loans are measured at their unpaid principal balance plus accrued interest. Expenses Plan expenses are paid by the Plan or the Plan sponsor as provided in the Plan document. Fees incurred by the Plan for investment management services of $48 thousand are presented as a reduction to investment income in the Statement of Changes in Net Assets Available for Benefits for the year ended December 31, 2025. Payment of Benefits Benefit payments to participants are recorded upon distribution. Amounts allocated to accounts of participants who have elected to withdraw funds from the Plan but have not yet been paid were $35 thousand and $75 thousand at December 31, 2025 and 2024, respectively. Transfers A participant may elect to transfer their vested FSSP Retirement Account balance to the Northrop Grumman Retirement Plan “B” pension plan as permitted by the Plan. The total amount transferred from the Plan to the Northrop Grumman Retirement Plan “B” pension plan was $7.4 million for the year ended December 31, 2025.

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	NORTHROP GRUMMAN CORPORATION
Amendment Flag	false
Entity Central Index Key	0001133421
EBP, NGSP
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	NORTHROP GRUMMAN CORPORATION
Amendment Flag	false
Entity Central Index Key	0001133421

FEDERAL INCOME TAX STATUS	12 Months Ended
FEDERAL INCOME TAX STATUS	Dec. 31, 2025
EBP, NGSP
EBP, Tax Status [Line Items]
FEDERAL INCOME TAX STATUS	9. FEDERAL INCOME TAX STATUS The Plan obtained its latest determination letter dated December 16, 2015, in which the IRS determined that the Plan’s terms at the time of the determination letter application were in compliance with applicable sections of the Code and, therefore, is exempt from taxation. In December 2016, the IRS began publishing a Required Amendments List for individually designed plans which specifies changes in qualification requirements. The list is published annually and requires plans to be amended for each item on the list, as applicable, to retain its tax-exempt status. Management believes the Plan and related trust are currently designed, have been amended, and are being operated in compliance with the applicable requirements of the Code. Therefore, no provision for income taxes has been included in the Plan’s financial statements.

PLAN TERMINATION	12 Months Ended
PLAN TERMINATION	Dec. 31, 2025
EBP, NGSP
EBP, Description of Plan [Line Items]
PLAN TERMINATION	8. PLAN TERMINATION Although it has not expressed any intention to do so, the Company has the right under the Plan to terminate the Plan subject to ERISA provisions. In the event of a Plan termination, Plan participants would continue to be fully vested in their accounts.