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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, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 33,646 | $ 34,978
Receivables, net |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 72 | 68
Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 26,442 | 28,080
Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,727 | 1,419
Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,936 | 4,922
Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5,406 | 5,370
Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,587 | 4,453
Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,890 | 4,910
Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,399 | 3,775
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 | 571 | 817
Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,926 | 2,414
Investments measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7,132 | 6,830
Investments measured at NAV | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 29 | 68
Investments measured at NAV | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 828 | 718
Investments measured at NAV | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 144 | 99
Investments measured at NAV | Private equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,014 | 4,334
Investments measured at NAV | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,117 | 1,611
Level 1 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 12,490 | 13,172
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 | 1,727 | 1,419
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 | 3,927 | 4,905
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 | 5,400 | 5,355
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 | 1,436 | 1,493
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 | 0 | 0
Level 2 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 13,000 | 14,887
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 | 3 | 14
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 | 0 | 13
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 | 2,151 | 2,960
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 | 4,888 | 4,905
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 | 3,399 | 3,775
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 | 571 | 817
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 | 1,988 | 2,403
Level 3 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 952 | 21
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 | 6 | 3
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 | 6 | 2
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 | 5
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 | $ 938 | $ 11

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