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Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
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 each year included the following (in millions):
 Qualified Defined
Benefit Pension Plans 		Retiree Medical and
Life Insurance Plans
202120202019202120202019
Operating:
Service cost$106 $101 $516 $13 $13 $14 
Non-operating:
Interest cost1,220 1,538 1,806 53 70 97 
Expected return on plan assets(2,146)(2,264)(2,300)(141)(127)(110)
Recognized net actuarial losses (gains)902 849 1,404 — (4)2 
Amortization of net prior service (credits) costs (349)(342)(333)37 39 42 
Settlement charge1,665 — — — — — 
Non-service FAS pension expense (income)1,292 (219)577 (51)(22)31 
Net periodic benefit expense (income)$1,398 $(118)$1,093 $(38)$(9)$45 
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 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
2021202020212020
Change in benefit obligation
Beginning balance (a)
$51,352 $48,674 $2,271 $2,226 
Service cost106 101 13 13 
Interest cost1,220 1,538 53 70 
Actuarial (gains) losses (b)
(2,045)4,610 (352)117 
Settlements (c)
(4,885)(1,392)— — 
Plan amendments and curtailments2 9 — (8)
Benefits paid(2,303)(2,188)(217)(220)
Medicare Part D subsidy— — 4 3 
Participants’ contributions— — 67 70 
Ending balance (a)
$43,447 $51,352 $1,839 $2,271 
Change in plan assets
Beginning balance at fair value$38,481 $35,442 $2,085 $1,889 
Actual return on plan assets (d)
3,899 5,594 224 298 
Settlements (c)
(4,885)(1,392)— — 
Benefits paid(2,303)(2,188)(217)(220)
Company contributions— 1,025 6 45 
Medicare Part D subsidy— — 4 3 
Participants’ contributions— — 67 70 
Ending balance at fair value$35,192 $38,481 $2,169 $2,085 
Unfunded status of the plans$(8,255)$(12,871)$330 $(186)
(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 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 2021 and 2020 represent the transfer of gross defined benefit pension obligations and related plan assets to insurance companies pursuant to the group annuity contracts purchased on August 3, 2021 and December 3, 2020, respectively, 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 10.5% in 2021 and 16.5% in 2020.
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
2021202020212020
Other noncurrent assets$64 $3 $330 $— 
Accrued pension liabilities(8,319)(12,874)— — 
Other noncurrent liabilities— — — (186)
Net (unfunded) funded status of the plans$(8,255)$(12,871)$330 $(186)
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
2021202020212020
Accumulated other comprehensive loss (pre-tax) related to:
Net actuarial losses$14,675 $21,040 $(554)$(119)
Prior service (credit) cost(884)(1,235)36 73 
Total
$13,791 $19,805 $(518)$(46)
Estimated tax(2,947)(4,230)110 9 
Net amount recognized in accumulated other comprehensive loss$10,844 $15,575 $(408)$(37)
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
202120202019202120202019
 gains (losses)(gains) losses
Actuarial gains and losses
Qualified defined benefit pension plans$2,987 $(1,005)$(2,283)$2,019 $668 $1,104 
Retiree medical and life insurance plans342 43 238 — (3)2 
Other plans76 (104)(133)24 24 42 
 3,405 (1,066)(2,178)2,043 689 1,148 
 credit (cost)(credit) cost
Net prior service credit and cost
Qualified defined benefit pension plans(1)(7)(8)(274)(269)(263)
Retiree medical and life insurance plans— 6 4 29 30 33 
Other plans— — — (11)(10)(10)
 (1)(1)(4)(256)(249)(240)
 $3,404 $(1,067)$(2,182)$1,787 $440 $908 
Actuarial Assumptions Used to Determine Net Periodic Benefit Cost
 Qualified Defined Benefit
Pension Plans		Retiree Medical and
Life Insurance Plans
202120202019202120202019
Weighted average discount rate2.875 %2.500 %3.250 %2.750 %2.375 %3.250 %
Expected long-term rate of return on assets6.50 %7.00 %7.00 %6.50 %7.00 %7.00 %
Health care trend rate assumed for next year7.50 %7.75 %8.00 %
Ultimate health care trend rate4.50 %4.50 %4.50 %
Year ultimate health care trend rate is reached   203420342034
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%
Equity
15-65%
Fixed income
10-60%
Alternative investments:
Private equity funds
0-15%
Real estate funds
0-10%
Hedge funds
0-20%
Commodities
0-15%
The following table presents the fair value of the assets (in millions) 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, 2021December 31, 2020
TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Investments measured at fair value
Cash and cash equivalents (a)
$991 $991 $— $— $1,109 $1,109 $— $— 
Equity (a):
U.S. equity securities6,479 6,444 5 30 7,535 7,467 8 60 
International equity securities4,882 4,880 — 2 6,844 6,836 — 8 
Commingled equity funds869 36 833 — 1,671 442 1,228 1 
Fixed income (a):
Corporate debt securities6,397 — 6,295 102 5,732 — 5,730 2 
U.S. Government securities2,864 — 2,864 — 2,506 — 2,506 — 
U.S. Government-sponsored enterprise securities
228 — 228 — 230 — 230 — 
Other fixed income investments (b)
4,736 49 3,071 1,616 5,873 37 4,063 1,773 
Total$27,446 $12,400 $13,296 $1,750 $31,500 $15,891 $13,765 $1,844 
Investments measured at NAV
Commingled equity funds130 92 
Other fixed income investments701 541 
Private equity funds5,386 4,672 
Real estate funds3,059 2,650 
Hedge funds556    1,111    
Total investments measured at NAV
9,832    9,066    
Receivables, net83    —    
Total$37,361    $40,566    
(a)Cash and cash equivalents, equity securities and fixed income securities included derivative assets and liabilities whose fair values were not material as of December 31, 2021 and 2020. 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 $1.5 billion at December 31, 2021 and $1.7 billion at December 31, 2020 related to the buy-in contracts discussed above.
Estimated Future Benefit Payments The following table presents estimated future benefit payments as of December 31, 2021 (in millions):
202220232024202520262027 – 2031
Qualified defined benefit pension plans$1,980 $2,080 $2,160 $2,230 $2,290 $11,700 
Retiree medical and life insurance plans140 140 140 130 130 570