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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, 2017 | Dec. 31, 2016
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 34,978 | $ 33,204
Receivables, net |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 68 | 53
Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 28,087 | 27,604
Investments measured at fair value | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,419 | 2,301
Investments measured at fair value | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,922 | 4,166
Investments measured at fair value | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 5,370 | 3,971
Investments measured at fair value | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,453 | 2,332
Investments measured at fair value | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,910 | 4,333
Investments measured at fair value | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 3,775 | 6,811
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 | 817 | 919
Investments measured at fair value | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2,412 | 2,215
Investments measured at fair value | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7 | 33
Investments measured at fair value | Commodities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 2 | 523
Investments measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 6,823 | 5,547
Investments measured at NAV | Other fixed income investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 68 | 0
Investments measured at NAV | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 711 | 462
Investments measured at NAV | Commingled equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 99 | 60
Investments measured at NAV | Private equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 4,334 | 3,614
Investments measured at NAV | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1,611 | 1,411
Level 1 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 13,173 | 11,680
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 | 1,419 | 2,301
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 | 4,905 | 4,139
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 | 5,355 | 3,927
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 | 1,493 | 788
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 1 | Investments measured at fair value | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 0 | 0
Level 1 | Investments measured at fair value | Commodities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1 | 525
Level 2 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 14,893 | 15,898
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 | 14 | 23
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 | 13 | 40
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 | 2,960 | 1,544
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 | 4,905 | 4,316
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 | 3,775 | 6,811
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 | 817 | 919
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 | 2,401 | 2,214
Level 2 | Investments measured at fair value | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 7 | 33
Level 2 | Investments measured at fair value | Commodities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 1 | (2)
Level 3 | Investments measured at fair value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | 21 | 26
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 | 3 | 4
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 | 2 | 4
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 | 5 | 17
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 | 11 | 1
Level 3 | Investments measured at fair value | Hedge 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 | Commodities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at end of year | $ 0 | $ 0

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