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Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs The pretax FAS (expense) income 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
202220212020202220212020
Operating:
Service cost$(87)$(106)$(101)$(9)$(13)$(13)
Non-operating:
Interest cost(1,289)(1,220)(1,538)(49)(53)(70)
Expected return on plan assets1,854 2,146 2,264 136 141 127 
Recognized net actuarial (losses) gains(425)(902)(849)46 — 4 
Amortization of prior service credits (costs) 359 349 342 (27)(37)(39)
Settlement charge(1,470)(1,665)— — — — 
Non-service FAS (expense) income(971)(1,292)219 106 51 22 
Total FAS (expense) income$(1,058)$(1,398)$118 $97 $38 $9 
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
2022202120222021
Change in benefit obligation
Beginning balance (a)
$43,447 $51,352 $1,839 $2,271 
Service cost87 106 9 13 
Interest cost1,289 1,220 49 53 
Actuarial (gains) losses (b)
(10,270)(2,045)(396)(352)
Settlements (c)
(4,309)(4,885)— — 
Plan amendments186 2 1 — 
Benefits paid(1,732)(2,303)(207)(217)
Medicare Part D subsidy— — 3 4 
Participants’ contributions— — 61 67 
Ending balance (a)
$28,698 $43,447 $1,359 $1,839 
Change in plan assets
Beginning balance at fair value$35,192 $38,481 $2,169 $2,085 
Actual return on plan assets (d)
(5,923)3,899 (381)224 
Settlements (c)
(4,309)(4,885)— — 
Benefits paid(1,732)(2,303)(207)(217)
Company contributions— — 11 6 
Medicare Part D subsidy— — 3 4 
Participants’ contributions— — 61 67 
Ending balance at fair value$23,228 $35,192 $1,656 $2,169 
(Unfunded) funded status of the plans$(5,470)$(8,255)$297 $330 
(a)Benefit obligation balances represent the projected benefit obligation for our qualified defined benefit pension plans and the accumulated benefit obligation for our retiree medical and life insurance plans.
(b)Actuarial gains for our qualified defined benefit pension plans in 2022 primarily reflect an increase in the discount rate from 2.875% at December 31, 2021 to 5.25% at December 31, 2022, which decreased benefit obligations by $10.2 billion. Actuarial gains for our retiree medical and life insurance plans in 2022 reflect an increase in the discount rate from 2.750% at December 31, 2021 to 5.25% at December 31, 2022, which decreased benefit obligations by $335 million. Actuarial gains for our qualified defined benefit pension plans in 2021 primarily reflect an increase in the discount rate from 2.50% at December 31, 2020 to 2.875% at December 31, 2021, which decreased benefit obligations by $2.3 billion, partially offset by an increase of approximately $250 million due to changes in longevity assumptions and participant data. Actuarial gains for our retiree medical and life insurance plans in 2021 reflect an increase in the discount rate from 2.375% at December 31, 2020 to 2.75% at December 31, 2021, which decreased benefit obligations by $70 million, and $282 million due to changes in plan participation assumptions and claims data.
(c)Qualified defined benefit pension plan settlements in 2022 and 2021 represent the transfer of gross defined benefit pension obligations and related plan assets to insurance companies pursuant to group annuity contracts purchased in the second quarter of 2022 and third quarter of 2021 as described above.
(d)Actual return on plan assets for our qualified defined benefit pension plans and retiree medical and life insurance plans was approximately (18)% in 2022 and 10.5% in 2021.
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
2022202120222021
Other noncurrent assets$2 $64 $297 $330 
Accrued pension liabilities(5,472)(8,319)— — 
Net (unfunded) funded status of the plans$(5,470)$(8,255)$297 $330 
Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax The following table provides the amount of actuarial gains or losses and prior service costs or credits recognized in accumulated other comprehensive loss related to qualified defined benefit pension plans and retiree medical and life insurance plans at December 31 (in millions):
 Qualified Defined 
Benefit Pension Plans		Retiree Medical and
Life Insurance Plans
2022202120222021
Accumulated other comprehensive (loss) pre-tax related to:
Net actuarial (losses)$(10,287)$(14,675)$387 $554 
Prior service credit (cost)339 884 (10)(36)
Total
$(9,948)$(13,791)$377 $518 
Estimated tax2,117 2,947 (79)(110)
Net amount recognized in accumulated other comprehensive (loss)$(7,831)$(10,844)$298 $408 
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
202220212020202220212020
Actuarial gains and (losses)
Qualified defined benefit pension plans$1,952 $2,987 $(1,005)$(1,490)$(2,019)$(668)
Retiree medical and life insurance plans(95)342 43 36 — 3 
Other plans165 76 (104)(39)(24)(24)
 2,022 3,405 (1,066)(1,493)(2,043)(689)
Net prior service credit and (cost)
Qualified defined benefit pension plans(146)(1)(7)283 274 269 
Retiree medical and life insurance plans(1)— 6 (22)(29)(30)
Other plans(2)— — 7 11 10 
 (149)(1)(1)268 256 249 
Total$1,873 $3,404 $(1,067)$(1,225)$(1,787)$(440)
Actuarial Assumptions Used to Determine Net Periodic Benefit Cost
 Qualified Defined Benefit
Pension Plans		Retiree Medical and
Life Insurance Plans
202220212020202220212020
Weighted average discount rate (a)
5.250 %2.875 %2.500 %5.250 %2.750 %2.375 %
Expected long-term rate of return on assets (a)
6.50 %6.50 %7.00 %6.50 %6.50 %7.00 %
Health care trend rate assumed for next year7.25 %7.50 %7.75 %
Ultimate health care trend rate4.50 %4.50 %4.50 %
Year ultimate health care trend rate is reached   203420342034
(a)A pension discount rate of 4.75%, and 2.75%, was used for the applicable plans following the transaction and remeasurement recognized in the second quarter of 2022, and third quarter of 2021, respectively. We lowered our expected long-term rate of return on plan assets from 7.00% to 6.50% in connection with the third quarter of 2021 remeasurement, applicable to all qualified defined benefit pension and retiree medical and life insurance plans as of the December 31, 2021 remeasurement.
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
15-65%
Fixed income
10-60%
Alternative investments:
Private equity funds
5-25%
Real estate funds
5-15%
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, 2022December 31, 2021
(in millions)
TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Investments measured at fair value
Cash and cash equivalents (a)
$1,952 $1,952 $— $— $991 $991 $— $— 
Equity (a):
U.S. equity securities3,162 3,060 6 96 6,479 6,444 5 30 
International equity securities2,298 2,245 17 36 4,882 4,880 — 2 
Commingled equity funds459 183 276 — 869 36 833 — 
Fixed income (a):
Corporate debt securities4,491 — 4,272 219 6,397 — 6,295 102 
U.S. Government securities2,219 — 2,219 — 2,864 — 2,864 — 
U.S. Government-sponsored enterprise securities
572 — 572 — 228 — 228 — 
Interest rate swaps, net(1,165)— (1,165)— 636 — 636 — 
Other fixed income investments (b)
1,980 81 680 1,219 4,100 49 2,435 1,616 
Total$15,968 $7,521 $6,877 $1,570 $27,446 $12,400 $13,296 $1,750 
Investments measured at NAV
Commingled equity funds— 130 
Other fixed income investments730 701 
Private equity funds4,703 5,386 
Real estate funds3,383 3,059 
Hedge funds689    556    
Total investments measured at NAV
9,505    9,832    
Loan, net (c)
(497)— 
(Payables) Receivables, net(92)   83    
Total$24,884    $37,361    
(a)Cash and cash equivalents, equity securities and fixed income securities included derivative assets and liabilities with fair values that were not material as of December 31, 2022 and 2021. 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)Level 3 investments include $1.1 billion at December 31, 2022 and $1.5 billion at December 31, 2021 related to buy-in contracts.
(c)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.
Estimated Future Benefit Payments The following table presents estimated future benefit payments as of December 31, 2022 (in millions):
202320242025202620272028 – 2032
Qualified defined benefit pension plans$1,720 $1,810 $1,890 $1,950 $2,000 $10,150 
Retiree medical and life insurance plans140 130 130 120 120 530