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Postretirement Benefit Plans - Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans by Asset Category (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 37,361 | $ 40,566
Buy-In Contract |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan with benefit obligations equal to plan assets | 1,500 | 1,700
Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 27,446 | 31,500
Level 1, 2 and 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 991 | 1,109
Level 1, 2 and 3 | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 6,479 | 7,535
Level 1, 2 and 3 | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,882 | 6,844
Level 1, 2 and 3 | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 869 | 1,671
Level 1, 2 and 3 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 6,397 | 5,732
Level 1, 2 and 3 | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,864 | 2,506
Level 1, 2 and 3 | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 228 | 230
Level 1, 2 and 3 | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,736 | 5,873
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 12,400 | 15,891
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 991 | 1,109
Level 1 | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 6,444 | 7,467
Level 1 | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,880 | 6,836
Level 1 | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 36 | 442
Level 1 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 49 | 37
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 13,296 | 13,765
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 2 | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5 | 8
Level 2 | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 2 | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 833 | 1,228
Level 2 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 6,295 | 5,730
Level 2 | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,864 | 2,506
Level 2 | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 228 | 230
Level 2 | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,071 | 4,063
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,750 | 1,844
Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 30 | 60
Level 3 | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2 | 8
Level 3 | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 1
Level 3 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 102 | 2
Level 3 | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,616 | 1,773
NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 9,832 | 9,066
NAV | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 701 | 541
NAV | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 130 | 92
NAV | Private equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5,386 | 4,672
NAV | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,059 | 2,650
NAV | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 556 | 1,111
NAV | Receivables, net |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 83 | $ 0

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