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Stockholders' Equity - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | $ 37,261 | $ 41,529 | $ 35,905
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform | (109) |  |
Other comprehensive income (loss) before reclassifications | (404) | 145 | (452)
Amounts reclassified from accumulated other comprehensive loss | 183 | 239 | 380
Income taxes | (18) | (15) | (13)
Balance | 36,586 | 37,261 | 41,529
Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | (2,139) | (2,136) | (2,053)
Other comprehensive income (loss) before reclassifications | (191) | (3) | (83)
Balance | (2,330) | (2,139) | (2,136)
Marketable Securities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | 13 | 21 |
Other comprehensive income (loss) before reclassifications | (11) | (8) | 21
Balance | 2 | 13 | 21
Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | 3 | (19) | (39)
Other comprehensive income (loss) before reclassifications | (16) | 22 | (101)
Amounts reclassified from accumulated other comprehensive loss | 1 |  | 121
Balance | (12) | 3 | (19)
Pension and Other Postretirement Benefit Plans |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | (2,151) | (2,509) | (2,466)
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform | (109) |  |
Other comprehensive income (loss) before reclassifications | (186) | 134 | (289)
Amounts reclassified from accumulated other comprehensive loss | 182 | 239 | 259
Income taxes | (18) | (15) | (13)
Balance | (2,282) | (2,151) | (2,509)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | (4,274) | (4,643) | (4,558)
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform | (109) |  |
Balance | $ (4,622) | $ (4,274) | $ (4,643)

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