Entity tax identification number Entity Tax Identification Number Total investments at fair value Total assets in the DC Master Trust Short-term investment fund - at fair value EBP, Investment, Fair Value Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover 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] Total Fully Corrected Under VFCP and PTE 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected Liability to participant EBP, Liability to Participant Schwab Personal Choice Retirement Account EBP, Self-Directed Brokerage Account [Member] 35–49 EBP, Retirement Account Contribution, Age 35 Through 49 [Member] EBP, Retirement Account Contribution, Age 35 Through 49 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 Accrued expenses EBP, Accrued Expense Short-term investment fund Total Other Plan Investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 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] Less than 35 EBP, Retirement Account Contribution, Under Age 35 [Member] EBP, Retirement Account Contribution, Under Age 35 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 of plan assets in due to merger 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, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Next 2% of participant’s eligible compensation Next Two Percent Of Eligible Compensation [Member] Next Two Percent Of Eligible Compensation 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] EBP 011 EBP 011 [Member] EBP 011 Next 4% of participant’s eligible compensation Next Four Percent Of Eligible Compensation [Member] Next Four Percent Of Eligible Compensation Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Master Trust [Abstract] Plan interest in the Huntington Ingalls Industries, Inc. Defined Contribution Plans Master Trust EBP, Investment, Plan Interest in Master Trust, Contract Value Use of Estimates EBP, Use of Estimate [Policy Text Block] Maximum number of after-tax contribution withdrawals per quarter EBP, Maximum Number Of After-Tax Contribution Withdrawals Per Quarter EBP, Maximum Number Of After-Tax Contribution Withdrawals Per Quarter 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 EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type Less: amounts allocated to withdrawing participants EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid EBP, Employee Eligible Compensation, Percent [Domain] EBP, Employee Eligible Compensation, Percent [Domain] EBP, Employee Eligible Compensation, Percent [Domain] EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] 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 investments EBP, Investment, Fair Value And Plan Interest In Master Trust, Contract Value EBP, Investment, Fair Value And Plan Interest In Master Trust, Contract Value 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 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 DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] Contributions Pending Correction in VFCP EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP 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] EBP, Employee Eligible Compensation, Percent [Axis] EBP, Employee Eligible Compensation, Percent [Axis] EBP, Employee Eligible Compensation, Percent Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Total EBP, Asset Held for Investment Total investments at contract value Synthetic guaranteed investment contracts - 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] 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 Contributions Corrected Outside VFCP EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP EBP, Tax Status [Table] EBP, Tax Status [Table] INCREASE IN NET ASSETS PRIOR TO TRANSFER EBP, Change in Net Asset Available for Benefit, Increase (Decrease) 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 First 2% of participant’s eligible compensation First Two Percent Of Eligible Compensation [Member] First Two Percent Of Eligible Compensation 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 Participant Contributions Transferred Late to Plan EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Vesting 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] Participant contribution, automatic, enrollment period following date of hire EBP, Participant Contribution, Automatic, Enrollment Period Following Date Of Hire EBP, Participant Contribution, Automatic, Enrollment Period Following Date Of Hire EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] At contract value: EBP, Investment, Contract Value [Abstract] 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, Contribution EBP, Contribution [Table Text Block] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] 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 Notes receivable from participants EBP, Note Receivable from Participant Master Trust Balances EBP, Nonconsolidated, Master Trust [Member] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage 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 Participant contribution, minimum increment, percent EBP, Participant Contribution, Minimum Increment, Percent EBP, Participant Contribution, Minimum Increment, Percent Percentage of Compensation EBP, Employer Contribution, Retirement Account Contribution, Percentage Of Compensation EBP, Employer Contribution, Retirement Account Contribution, Percentage Of Compensation Schedule of Master Trust Net Assets EBP, Master Trust [Table Text Block] Liabilities: EBP, Liability [Abstract] Maximum number of company matching contribution withdrawals per quarter EBP, Maximum Number Of Company Matching Contribution Withdrawals Per Quarter EBP, Maximum Number Of Company Matching Contribution Withdrawals Per Quarter FORM 5500, SCHEDULE H, PART IV, LINE 4a, SCHEDULE OF DELINQUENT PARTICIPANT CONTRIBUTIONS EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] 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] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Participant contribution, automatic, annual increase deferral rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Document Information [Table] Document Information [Table] 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] 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] Contributions Not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected 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] Minimum annual compensation to total compensation, percentage EBP, Participant Contribution, Minimum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Minimum Contribution to Eligible Compensation, Percentage Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Company Match EBP, Employer Contribution, Matching Percentage Forfeited nonvested account EBP, Forfeited Nonvested Account Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets 50 or older EBP, Retirement Account Contribution, Age 50 And Above [Member] EBP, Retirement Account Contribution, Age 50 And Above 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]