Entity tax identification number Entity Tax Identification Number Total Investments at fair value EBP, Investment, Fair Value Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Cash and cash equivalents and short-term investment fund Cash And Cash Equivalents And Short-Term Investment Fund [Member] Cash And Cash Equivalents And Short-Term Investment Fund Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] U.S. Government securities US Treasury Securities [Member] Registered investment companies (mutual funds) Mutual Fund [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Self-directed brokerage account EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Administrative expenses payable Accrued expenses Amounts per Form 5500 EBP, Accrued Expense Cost EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution, Cost EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution, Cost Plan’s Interest in Master Trust Balance 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] Corporate debt securities Corporate Debt Securities [Member] Total assets EBP, Asset Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets: 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] Payments of Benefits EBP, Payment to Participant [Policy Text Block] Transfers into the plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Amendment Flag Amendment Flag Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Due from broker for securities sold EBP, Investment Sale, Receivable 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] Participant- Directed Investments  EBP, Participant-Directed [Member] Difference EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Decrease From Interest Income On Note Receivable From Participant Adjustment EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Decrease From Interest Income On Note Receivable From Participant Adjustment Amount owed to Corporation EBP, Master Trust, Liability To Employer EBP, Master Trust, Liability To Employer Investments [Domain] Investments [Domain] EBP, Master Trust [Abstract] Investments in fully benefit-responsive investment contracts at contract value EBP, Investment, Plan Interest in Master Trust, Contract Value Use of Estimates EBP, Use of Estimate [Policy Text Block] Form 5500, Schedule H, Line 4i – Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Difference EBP, Reconciliation To Form 5500, Administrative Expense Adjustment EBP, Reconciliation To Form 5500, Administrative Expense Adjustment Amounts per Form 5500 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) From Gain (Loss) On Investment EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) From Gain (Loss) On Investment Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP 055 EBP 055 [Member] EBP 055 Accrued interest and dividends EBP, Investment Income, Receivable Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants Amounts per Financial Statements 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 Interest in net investment gain from participation in Lockheed Martin Corporation Defined Contribution Plans Master Trust Amounts per Financial Statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Maximum borrowing capacity EBP, Stock And ESOP Fund, Maximum Borrowing Capacity EBP, Stock And ESOP Fund, Maximum Borrowing Capacity Plan number EBP, Plan Number 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] 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] Common stocks - Lockheed Martin EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Administrative expenses Amounts per Financial Statements EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense 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 Fully benefit-responsive investment contracts at contract value EBP, Investment, Contract Value Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Master Trust EBP, Master Trust [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2  Fair Value, Inputs, Level 2 [Member] Difference EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) From Gain (Loss) On Investment Adjustment EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) From Gain (Loss) On Investment Adjustment EBP, Tax Status [Table] EBP, Tax Status [Table] Change in net assets EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP 020 EBP 020 [Member] EBP 020 Parties-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] Receivables, net EBP, Receivable EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Interest in Lockheed Martin Corporation Defined Contribution Plans Master Trust: EBP, Investment, Fair Value [Abstract] Dividends earned EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Distributions and withdrawals EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Investments at fair value EBP, Investment, Plan Interest in Master Trust, Fair Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] Initial transfer EBP, Self-Directed Brokerage Account, Initial Transfer EBP, Self-Directed Brokerage Account, Initial Transfer EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Due to broker for securities purchased EBP, Liability for Investment Purchase Other investments Other Security Investments [Member] EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Other payables EBP, Other Liability EBP 019 EBP 019 [Member] EBP 019 Automatic deferral rate, annual increase 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. EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Administrative Expenses EBP, Expense [Policy Text Block] Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Common and preferred stocks Common And Preferred Stocks [Member] Common And Preferred Stocks Document Type Document Type Prepayment period EBP, Stock Fund And ESOP, Prepayment Period On Borrowings EBP, Stock Fund And ESOP, Prepayment Period On Borrowings Entity Central Index Key Entity Central Index Key Subsequent transfers EBP, Self-Directed Brokerage Account, Subsequent Transfers EBP, Self-Directed Brokerage Account, Subsequent Transfers Notes receivable from participants, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common/collective trusts Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions from net assets: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Accrual variance EBP, Investment, Plan Interest in Master Trust, Fair Value, Variance EBP, Investment, Plan Interest in Master Trust, Fair Value, Variance Notes receivable from participants Current Value EBP, Note Receivable from Participant Master Trust Balance 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 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 EBP, Master Trust EBP, Master Trust [Table Text Block] EBP 021 EBP 021 [Member] EBP 021 Liabilities EBP, Liability [Abstract] EBP 018 EBP 018 [Member] EBP 018 Income Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Amounts per Form 5500 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase From Interest Income On Note Receivable From Participant EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase From Interest Income On Note Receivable From Participant 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] Document Information [Table] Document Information [Table] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Other receivables EBP, Other Receivable Total net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Matching percentage EBP, Employer Contribution, Matching Percentage EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]