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Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs
The pretax FAS income (expense) related to our qualified defined benefit pension plans and retiree medical and life insurance plans included the following (in millions):
 Qualified Defined
Benefit Pension Plans 		Retiree Medical and
Life Insurance Plans
202420232022202420232022
Operating:
Service cost$(60)$(65)$(87)$(5)$(5)$(9)
Non-operating:
Interest cost(1,398)(1,459)(1,289)(63)(68)(49)
Expected return on plan assets1,572 1,722 1,854 107 103 136 
Amortization of net actuarial (losses) gains(259)(168)(425)35 31 46 
Amortization of prior service credits (costs) 147 348 359 (4)(10)(27)
Settlement charge (a)
— — (1,470)— — — 
Non-service FAS income (expense) 62 443 (971)75 56 106 
Total FAS income (expense) $2 $378 $(1,058)$70 $51 $97 
(a)During 2022, we recognized a settlement charge of $1.5 billion related to the accelerated recognition of actuarial losses for certain defined benefit pension plans that purchased group annuity contracts from an insurance company.
Schedule of Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status
The following table provides a reconciliation of benefit obligations, plan assets and net (unfunded) funded status of our qualified defined benefit pension plans and our retiree medical and life insurance plans (in millions):
 Qualified Defined 
Benefit Pension Plans		Retiree Medical and
Life Insurance Plans
2024202320242023
Change in benefit obligation
Beginning balance (a)
$28,959 $28,698 $1,328 $1,359 
Service cost60 65 5 5 
Interest cost1,398 1,459 63 68 
Actuarial losses (gains) (b)
(1,556)731 (158)27 
Settlements (c)
— (414)— — 
Plan amendments2 6 — 1 
Benefits paid
(1,664)(1,586)(178)(192)
Medicare Part D subsidy— — 2 1 
Participants’ contributions— — 52 59 
Ending balance (a)
$27,199 $28,959 $1,114 $1,328 
Change in plan assets
Beginning balance at fair value$22,800 $23,228 $1,715 $1,656 
Actual return on plan assets (d)
288 1,572 86 190 
Settlements (c)
— (414)— — 
Benefits paid
(1,664)(1,586)(178)(192)
Company contributions990 — 1 1 
Medicare Part D subsidy— — 2 1 
Participants’ contributions— — 52 59 
Ending balance at fair value$22,414 $22,800 $1,678 $1,715 
(Unfunded) funded status of the plans$(4,785)$(6,159)$564 $387 
(a)Benefit obligation balances represent the projected benefit obligation for our qualified defined benefit pension plans, which is approximately equal to accumulated benefit obligation, and accumulated benefit obligation for our retiree medical and life insurance plans.
(b)Actuarial gains for our qualified defined benefit pension plans in 2024 primarily reflect an increase in the discount rate from 5.00% at December 31, 2023 to 5.625% at December 31, 2024, which decreased benefit obligations by approximately $1.8 billion offset by net losses of approximately $250 million due to changes in demographic data and assumptions. Actuarial gains for our retiree medical and life insurance plans in 2024 primarily reflect an increase in the discount rate from 5.00% at December 31, 2023 to 5.50% at December 31, 2024 and gains due to changes in demographic data and assumptions. Actuarial losses for our qualified defined benefit pension plans in 2023 primarily reflect a decrease in the discount rate from 5.25% at December 31, 2022 to 5.00% at December 31, 2023, which increased benefit obligations by approximately $765 million. Actuarial losses for our retiree medical and life insurance plans in 2023 reflect a decrease in the discount rate from 5.25% at December 31, 2022 to 5.00% at December 31, 2023.
(c)Qualified defined benefit pension plans settlements in 2023 include $414 million in the form of lump-sum settlement payments to former employees who had not commenced receiving their vested benefit payments. The settlement payments had no impact on year 2023 FAS pension income.
(d)Actual return on plan assets for our qualified defined benefit pension plans was approximately 1% in 2024 and 7% in 2023 versus the 6.50% long-term rate of return assumption.
Schedule of Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans
The following table provides amounts recognized on our consolidated balance sheets related to our qualified defined benefit pension plans and our retiree medical and life insurance plans (in millions):

 Qualified Defined 
Benefit Pension Plans		Retiree Medical and
Life Insurance Plans
2024202320242023
Other noncurrent assets$6 $3 $564 $387 
Accrued pension liabilities(4,791)(6,162)— — 
Net (unfunded) funded status of the plans$(4,785)$(6,159)$564 $387 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax
The following table provides the amount of actuarial gains or losses, and prior service costs or credits, recognized in accumulated other comprehensive loss related to qualified defined benefit pension plans and retiree medical and life insurance plans at December 31 (in millions):
 Qualified Defined 
Benefit Pension Plans		Retiree Medical and
Life Insurance Plans
2024202320242023
Accumulated other comprehensive (loss) pre-tax related to:
Net actuarial (losses) gains$(10,469)$(10,999)$518 $416 
Prior service (costs) credits(164)(15)2 (2)
Total
$(10,633)$(11,014)$520 $414 
Estimated tax2,255 2,339 (110)(87)
Net amount recognized in accumulated other comprehensive (loss)$(8,378)$(8,675)$410 $327 
The following table provides the changes recognized in accumulated other comprehensive loss, net of tax, for actuarial gains or losses and prior service costs or credits due to differences between the actual return and expected return on plan assets and changes in the fair value of the benefit obligation recognized in connection with our annual remeasurement and the amortization during the year for our qualified defined benefit pension plans, retiree medical and life insurance plans, and certain other plans (in millions):
 Incurred but Not Yet
Recognized in
FAS Expense		Recognition of
Previously
Deferred Amounts
202420232022202420232022
Actuarial gains and (losses)
Qualified defined benefit pension plans$211 $(698)$1,952 $(204)$(133)$(1,490)
Retiree medical and life insurance plans108 47 (95)28 25 36 
Other plans23 (33)165 (12)(8)(39)
 342 (684)2,022 (188)(116)(1,493)
Net prior service credit and (cost)
Qualified defined benefit pension plans(2)(5)(146)116 274 283 
Retiree medical and life insurance plans— (1)(1)(3)(8)(22)
Other plans— 1 (2)(1)(1)7 
 (2)(5)(149)112 265 268 
Total$340 $(689)$1,873 $(76)$149 $(1,225)
Schedule of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost The assumptions used to determine the benefit obligations at December 31 of each year and FAS expense for each subsequent year were as follows:
 Qualified Defined Benefit
Pension Plans		Retiree Medical and
Life Insurance Plans
202420232022202420232022
Weighted average discount rate
5.625 %5.00 %5.25 %5.50 %5.00 %5.25 %
Expected long-term rate of return on assets
6.50 %6.50 %6.50 %6.50 %6.50 %6.50 %
Health care trend rate assumed for next year8.50 %8.00 %7.25 %
Ultimate health care trend rate4.50 %4.50 %4.50 %
Year ultimate health care trend rate is reached   204120382034
Schedule of Allocation of Plan Assets
LMIMCo’s investment policies require that asset allocations of postretirement benefit plans be maintained within the following approximate ranges:
Asset ClassAsset Allocation
Ranges
Cash and cash equivalents
0-20%
Global Equity
10-65%
Fixed income
10-60%
Alternative investments:
Private equity funds
5-30%
Real estate funds
0-20%
Hedge funds
0-20%
Commodities
0-10%
The following table presents the fair value of the assets of our qualified defined benefit pension plans and retiree medical and life insurance plans by asset category and their level within the fair value hierarchy (see “Note 1 – Organization and Significant Accounting Policies - Investments” for definition of these levels), which we are required to disclose even though these assets are not separately recorded on our consolidated balance sheet. Certain investments are measured at their Net Asset Value (NAV) per share because such investments do not have readily determinable fair values and, therefore, are not required to be categorized in the fair value hierarchy. Assets measured at NAV have been included in the table below to permit reconciliation of the fair value hierarchy to amounts presented in the funded status table above.
 December 31, 2024December 31, 2023
(in millions)
TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Investments measured at fair value
Cash and cash equivalents (a)
$2,425 $2,425 $— $— $1,789 $1,789 $— $— 
Equity (a):
U.S. equity securities3,232 3,158 — 74 2,802 2,715 8 79 
International equity securities1,827 1,810 — 17 1,875 1,853 — 22 
Commingled equity funds382 170 212 — 423 163 260 — 
Fixed income (b):
Corporate debt securities4,159 — 4,099 60 4,510 — 4,495 15 
U.S. Government securities2,483 — 2,483 — 2,376 — 2,376 — 
U.S. Government-sponsored enterprise securities
1,134 — 1,134 — 1,120 — 1,120 — 
Interest rate swaps, net(1,878)(1,878)(1,284)(1,284)
Other fixed income investments (c)
2,050 60 882 1,108 1,949 63 725 1,161 
Total$15,814 $7,623 $6,932 $1,259 $15,560 $6,583 $7,700 $1,277 
Investments measured at NAV
Other fixed income investments552 826 
Private equity funds4,863 4,951 
Real estate funds3,088 3,267 
Hedge funds1,028    847    
Total investments measured at NAV
9,531    9,891    
Loan, net (d)
(473)(497)
(Payables) Receivables, net(780)   (439)   
Total$24,092    $24,515    
(a)Cash and cash equivalents and equity securities include derivative assets and liabilities with fair values that were not material as of December 31, 2024 and 2023. LMIMCo’s investment policies restrict the use of derivatives to either establish long or short exposures for purposes consistent with applicable investment mandate guidelines or to hedge risks to the extent of a plan’s current exposure to such risks. Most derivative transactions are settled on a daily basis.
(b)Fixed income securities include (i) derivative exposure for the liability hedge, which constitutes most of the value in interest rate swaps, and (ii) other derivative exposure with fair values that were not material as of December 31, 2024 and 2023.
(c)Level 3 investments include 1.0 billion at December 31, 2024 and $1.1 billion at December 31, 2023 related to buy-in contracts.
(d)The Lockheed Martin Corporation Master Retirement Trust (MRT) obtained a loan from a third-party financial institution, collateralized by private equity investments, to invest in fixed income securities.
Schedule of Estimated Future Benefit Payments
The following table presents estimated future benefit payments as of December 31, 2024 (in millions):
202520262027202820292030 – 2034
Qualified defined benefit pension plans$1,800 $1,860 $1,910 $1,960 $1,990 $9,990 
Retiree medical and life insurance plans110 110 110 100 100 440