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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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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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