Entity tax identification number Entity Tax Identification Number Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Total investments Total investments at fair value Total assets in the DC Master Trust 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] Liability to participant EBP, Liability to Participant Participant contribution, pretax, maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Schwab Personal Choice Retirement Account EBP, Self-Directed Brokerage Account [Member] 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 EBP, Employer Contribution Vesting, Tranche Two EBP, Employer Contribution Vesting, Tranche Two [Member] EBP, Employer Contribution Vesting, Tranche Two 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 Accrued expenses EBP, Accrued Expense Short-term investment fund Total Other Plan Investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Employee Contribution, Type [Domain] EBP, Employee Contribution, Type [Domain] EBP, Employee Contribution, Type [Domain] Short-term investment funds Money Market Funds [Member] 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 Note receivable from participant, account, primary residence, maximum borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term ASSETS: 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] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Transfers to other Huntington Ingalls Industries, Inc. pension plans EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Total liabilities EBP, Liability EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Employer Contribution Vesting [Domain] EBP, Employer Contribution Vesting [Domain] EBP, Employer Contribution Vesting [Domain] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, investment, number of shares (in shares) EBP, Investment, Number of Shares Receivables: EBP, Receivable [Abstract] EBP, Description of Plan and Accounting Change [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Savings Account EBP, Participant-Directed [Member] Investments [Domain] Investments [Domain] EBP, Master Trust [Abstract] EBP, FSSP Retirement Account Contribution EBP, FSSP Retirement Account Contribution [Member] EBP, FSSP Retirement Account Contribution Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Employer Contribution Vesting, Tranche One EBP, Employer Contribution Vesting, Tranche One [Member] EBP, Employer Contribution Vesting, Tranche One FORM 5500, SCHEDULE H, PART IV, LINE 4i, SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Requisite age for participation EBP, Requisite Age For Participation EBP, Requisite Age For Participation Transfers EBP, Transfers [Policy Text Block] EBP, Transfers Less: amounts allocated to withdrawing participants EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid 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] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Note receivable from participant, loans transferred in from plan merger, borrowing term (greater than) EBP, Note Receivable From Participant, Loans Transferred In From Plan Merger, Borrowing Term EBP, Note Receivable From Participant, Loans Transferred In From Plan Merger, Borrowing Term Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee deposits EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair 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] 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 Plan number EBP, Plan Number Involuntary cash-out limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit 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] Interest EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Note receivable from participant, general loan, maximum borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] HII common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Nonvested account, break in service forfeiture period EBP, Nonvested Account, Break In Service Forfeiture Period EBP, Nonvested Account, Break In Service Forfeiture Period Investment, Identifier [Axis] Investment, Identifier [Axis] Total EBP, Asset Held for Investment Total investments at contract value EBP, Investment, Contract Value Investment contribution, minimum increment, percent EBP, Investment Contribution, Minimum Increment, Percent EBP, Investment Contribution, Minimum Increment, Percent Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Interest-Bearing Deposits Interest-Bearing Deposits [Member] INVESTEMENTS INTEREST IN STABLE VALUE FUND EBP, Master Trust [Text Block] 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] Note receivable from participant, maximum number of loans outstanding EBP, Note Receivable From Participant, Maximum Number Of Loans Outstanding EBP, Note Receivable From Participant, Maximum Number Of Loans Outstanding EBP, investment, employer, common stock, to total asset, percentage EBP, Investment, Employer, Common Stock, to Total Asset, Percentage Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Tax Status [Table] EBP, Tax Status [Table] INCREASE IN NET ASSETS EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Employee Contribution, Type [Axis] EBP, Employee Contribution, Type [Axis] EBP, Employee Contribution, Type RELATED PARTY AND EXEMPT PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] Total EBP, Investment, Fair and Contract Value Participant loan, basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Related Party and Party-in-Interest Transactions [Abstract] Receivables EBP, Receivable EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] At fair value: EBP, Investment, Fair Value [Abstract] Participant contribution, automatic, deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants Benefits paid to participants per the financial statements EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Plan interest in the Huntington Ingalls Industries, Inc. Defined Contribution Plans Master Trust EBP, Investment, Plan Interest in Master Trust, Fair Value Asset held for investment, excluding plan interest in master trust, current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Employer contribution vesting service period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] Participant contribution, minimum percentage of annual compensation to total compensation to achieve maximum retirement benefit EBP, Participant Contribution, Minimum Percentage Of Annual Compensation To Total Compensation To Achieve Maximum Retirement Benefit EBP, Participant Contribution, Minimum Percentage Of Annual Compensation To Total Compensation To Achieve Maximum Retirement Benefit Employer contribution maximum vesting age EBP, Employer Contribution Maximum Vesting Age EBP, Employer Contribution Maximum Vesting Age EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] At contract value: EBP, Investment, Contract Value [Abstract] EBP, FSSP Savings Account Contribution EBP, FSSP Savings Account Contribution [Member] EBP, FSSP Savings Account Contribution Employer contribution vesting percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Employer Contribution Vesting [Axis] EBP, Employer Contribution Vesting [Axis] EBP, Employer Contribution Vesting EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Participant contribution, minimum percentage of pay cap limit to achieve maximum retirement benefit EBP, Participant Contribution, Minimum Percentage Of Pay Cap Limit To Achieve Maximum Retirement Benefit EBP, Participant Contribution, Minimum Percentage Of Pay Cap Limit To Achieve Maximum Retirement Benefit 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 Administrative and investment expenses EBP, Change In Net Asset Available For Benefit, Decrease From Administrative And Investment Expense EBP, Change In Net Asset Available For Benefit, Decrease From Administrative And Investment Expense Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Document Type Document Type PLAN TERMINATION EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Asset held for investment, participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Collective trust funds Common Collective Trust [Member] NET ASSETS AVAILABLE FOR BENEFITS: EBP, Net Asset Available for Benefit [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Accrued balance EBP, Accrued Balance Receivable EBP, Accrued Balance Receivable DEDUCTIONS: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Involuntary cash-out limit, maximum age EBP, Involuntary Cash-out Limit, Maximum Age EBP, Involuntary Cash-out Limit, Maximum Age Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Participant contribution, pretax, minimum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage Notes receivable from participants EBP, Note Receivable from Participant Master Trust Balances EBP, Nonconsolidated, Master Trust [Member] Investment contribution, maximum tax deferred compensation deposit, percent EBP, Investment Contribution, Maximum Tax Deferred Compensation Deposit, Percent EBP, Investment Contribution, Maximum Tax Deferred Compensation Deposit, Percent Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Schedule of Master Trust Net Assets EBP, Master Trust [Table Text Block] Liabilities: EBP, Liability [Abstract] Cost EBP, Investment, Excluding Plan Interest in Master Trust, Cost Pending receivable EBP, Pending Receivable EBP, Pending Receivable 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 EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] Participant contribution, automatic, annual increase deferral rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Document Information [Table] Document Information [Table] Retirement Account EBP, Nonparticipant-Directed [Member] Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Plan interest in the Huntington Ingalls Industries, Inc. Defined Contribution Plans Master Trust 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] EBP 310 EBP 310 [Member] EBP 310 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 Level 3 Fair Value, Inputs, Level 3 [Member] NET ASSETS AVAILABLE FOR BENEFITS Beginning of year End of year Net assets available for benefits per the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets NAV Fair Value Measured at Net Asset Value Per Share [Member] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]