Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Total investments Investment, fair value EBP, Investment, Fair Value Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] EBP, Contribution Type [Axis] EBP, Contribution Type [Axis] EBP, Contribution Type Investment in BrokerageLink account—at fair value BrokerageLink Account Mutual Fund [Member] Non-Elective Contribution ("NEC") Non-Elective Contribution ("NEC") [Member] Non-Elective Contribution ("NEC") Underlying securities of synthetic guaranteed investment contracts EBP, Debt Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Note receivable from participant, account, maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, account, minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Debt [Table] EBP, Debt [Table] Service period EBP, Requisite Service Period EBP, Requisite Service Period Accrued expenses EBP, Accrued Expense Initial collateral EBP, Collateral, Percentage Of Fair Value EBP, Collateral, Percentage Of Fair Value Collateral held under securities lending agreements EBP, Collateral Held Under Securities Lending Agreements EBP, Collateral Held Under Securities Lending Agreements Retirement Account Contribution ("RAC") Retirement Account Contribution ("RAC") [Member] Retirement Account Contribution ("RAC") EBP, Fully Benefit-Responsive Investment Contract [Abstract] Investment Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Cash Collateral EBP, Cash Collateral [Member] EBP, Cash Collateral Plan's Interest in Master Trust Balances EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Assets: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Foreign Foreign [Member] Foreign Payment of Benefits EBP, Payment to Participant [Policy Text Block] EBP, Trustee EBP, Trustee [Member] Total liabilities EBP, Liability U.S. equities US Treasury and Government [Member] EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Asset held for investment, plan interest in master trust, current value EBP, Asset Held for Investment, Plan Interest in Master Trust, Current Value Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] For employees with less than 5 years of service: Employees Hired After April 1, 2016 With Less Than Five Years Of Experience [Member] Employees Hired After April 1, 2016 With Less Than Five Years Of Experience EBP, Contribution, Participating Employer [Domain] EBP, Contribution, Participating Employer [Domain] EBP, Debt [Abstract] NGSP EBP, NGSP [Member] EBP, NGSP Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Contribution, Participating Employer [Axis] EBP, Contribution, Participating Employer [Axis] Less amounts allocated to withdrawing participants EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid EBP, Debt [Line Items] EBP, Debt [Line Items] Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Less amounts allocated to withdrawing participants at December 31, 2024 EBP, Reconciliation to Form 5500, Payment to Participant, Decrease from Allocation to Withdrawing Participant, Paid Synthetic guaranteed investment contracts EBP, Synthetic Investment Contract [Member] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Dividends, interest, taxes and other receivables EBP, Investment Income, Receivable Minimum Minimum [Member] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Investment Type [Axis] Investment Type [Axis] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Liabilities: Liabilities [Abstract] EBP, Contribution Type [Domain] EBP, Contribution Type [Domain] EBP, Contribution Type [Domain] Net appreciation in fair value of other investments Net appreciation in value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Other income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other Investment Income (Loss) EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Vesting period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment INTEREST IN SYNTHETIC GUARANTEED INVESTMENT CONTRACTS EBP, Interest In Investment Contracts [Text Block] EBP, Interest In Investment Contracts EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Employer, Common Stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Scenerio Three EBP, Employee Contribution, Scenerio Three [Member] EBP, Employee Contribution, Scenerio Three Total additions EBP, Change in Net Asset Available for Benefit, Increase Annual increase deferral rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. For employees with 5 or more years of service: Employees Hired After April 1, 2016 With Five Or More Years Of Experience [Member] Employees Hired After April 1, 2016 With Five Or More Years Of Experience Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] THIRD PARTY BORROWINGS EBP, Debt [Text Block] Short-term investment fund—at fair value State Street Bank and Trust Company short-term investment fund Short-Term Investments [Member] Investment, Identifier [Axis] Investment, Identifier [Axis] Expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total EBP, Asset Held for Investment Investment, contract value EBP, Investment, Contract Value Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Investments EBP, Master Trust [Text Block] Employer contribution, annual fixed rate contribution, percentage EBP, Employer Contribution, Annual Fixed Rate Contribution, Percentage Fixed rate annual contribution for eligible participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] Employer contribution, participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Interest in net assets EBP, Investment, Employer, Common Stock, to Total Asset, Percentage Scenerio One EBP, Employee Contribution, Scenerio One [Member] EBP, Employee Contribution, Scenerio One EBP, Tax Status [Table] EBP, Tax Status [Table] Increase in net assets EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EXEMPT PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Investments: EBP, Investment, Fair Value [Abstract] Note receivable from participant, account, time period for loans used to reduce maximum borrowing amount EBP, Note Receivable From Participant, Account, Time Period For Loans Used To Reduce Maximum Borrowing Amount EBP, Note Receivable From Participant, Account, Time Period For Loans Used To Reduce Maximum Borrowing Amount Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Debt EBP, Debt [Table Text Block] Plan interest in Northrop Grumman Defined Contribution Plans Master Trust (Note 3) Plan interest in master trust EBP, Investment, Plan Interest in Master Trust, Fair Value Asset held for investment, plan interest excluding plan interest in master trust EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value of Financial Instruments EBP, Fair Value Of Financial Instruments [Policy Text Block] EBP, Fair Value Of Financial Instruments Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] 50 or older EBP, Employee Contribution, 50 or Older [Member] EBP, Employee Contribution, 50 or Older EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Due to broker for securities purchased and other payables EBP, Liability for Investment Purchase EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Contribution EBP, Contribution [Table Text Block] Plan interest in the Northrop Grumman Defined Contribution Plans Master Trust EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Expenses EBP, Expense [Policy Text Block] Benefits paid to participants per Form 5500 EBP, Form 5500 Caption, Benefit Payment and Payments to Provide Benefits RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Participant loan, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Participant contributions EBP, Participant Contribution, Receivable Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type PLAN TERMINATION EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Collateral held under securities lending agreements EBP, Collateral Held Under Securities Lending Agreements [Member] EBP, Collateral Held Under Securities Lending Agreements Investment manager fees Investment manager fees Payment of Trustee fees EBP, Change in Net Asset Available for Benefit, Decrease from Investment Expense Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common/collective trust funds Common Collective Trust [Member] Requisite age for participation EBP, Requisite Age For Participation EBP, Requisite Age For Participation Net assets available for benefits EBP, Net Asset Available for Benefit [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Employer contributions reduced due to forfeitures EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Master Trust Balances EBP, Nonconsolidated, Master Trust [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type EBP, Master Trust EBP, Master Trust [Table Text Block] Employees Hired After April 1, 2016 Employees Hired After April 1, 2016 [Member] Employees Hired After April 1, 2016 Employees Hired Before April 1, 2016 Employees Hired Before April 1, 2016 [Member] Employees Hired Before April 1, 2016 FEDERAL INCOME TAX STATUS EBP, Tax Status [Text Block] Note receivable from participant, account, maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Under 35 EBP, Employee Contribution, Under 35 [Member] EBP, Employee Contribution, Under 35 Form 5500 caption, receivables, employer contributions EBP, Form 5500 Caption, Receivables, Employer Contributions Document Information [Table] Document Information [Table] Other investments: EBP, Investment, Valuation and Measurement [Abstract] Cash equivalents and short-term investment fund EBP, Cash Equivalents and Short Term Investment [Member] EBP, Cash Equivalents and Short Term Investment Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Participant loan, basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] U.S. Securities U.S. Securities [Member] U.S. Securities EBP, Non-Cash Collateral EBP, Non-Cash Collateral [Member] EBP, Non-Cash Collateral Payment to participant, not yet paid Add amounts allocated to withdrawing participants at December 31, 2025 EBP, Reconciliation to Form 5500, Payment to Participant, Increase from Allocation to Withdrawing Participant, Not yet Paid Net assets available for benefits Beginning of year End of year Net assets available for benefits EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeitures available EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Contributions over 8% EBP, Employee Contribution, Scenerio Four [Member] EBP, Employee Contribution, Scenerio Four Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets 35 – 49 EBP, Employee Contribution, 35-49 [Member] EBP, Employee Contribution, 35-49 Scenerio Two EBP, Employee Contribution, Scenerio Two [Member] EBP, Employee Contribution, Scenerio Two EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Master trust percentage EBP, Interest in Master Trust, Percentage EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]