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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, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 37,331 | $ 33,646
Receivables, net |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 78 | 72
Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 29,459 | 26,442
Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,961 | 1,727
Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,189 | 3,936
Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,244 | 5,406
Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,933 | 3,587
Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5,208 | 4,890
Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,260 | 3,399
Investments measured at fair value | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 530 | 571
Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,134 | 2,926
Investments measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,794 | 7,132
Investments measured at NAV | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 32 | 29
Investments measured at NAV | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 181 | 144
Investments measured at NAV | Private equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,019 | 4,014
Investments measured at NAV | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,493 | 2,117
Investments measured at NAV | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,069 | 828
Level 1 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 16,977 | 12,490
Level 1 | Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,961 | 1,727
Level 1 | Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,182 | 3,927
Level 1 | Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,217 | 5,400
Level 1 | Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 582 | 1,436
Level 1 | Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | Investments measured at fair value | 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 | Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 35 | 0
Level 2 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 11,505 | 13,000
Level 2 | Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 2 | Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 3
Level 2 | Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 23 | 0
Level 2 | Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,351 | 2,151
Level 2 | Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5,206 | 4,888
Level 2 | Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,260 | 3,399
Level 2 | Investments measured at fair value | U.S. Government-sponsored enterprise securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 530 | 571
Level 2 | Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,135 | 1,988
Level 3 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 977 | 952
Level 3 | Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7 | 6
Level 3 | Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4 | 6
Level 3 | Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2 | 2
Level 3 | Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 3 | Investments measured at fair value | 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 | Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 964 | 938
Buy-In Contract |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan with benefit obligations equal to plan assets | $ 857 | $ 810

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