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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | $ 37,261 | $ 41,529
Other comprehensive gain (loss) before reclassifications | (112) | (40)
Amounts reclassified from accumulated other comprehensive loss | 81 | 125
Net other comprehensive income | (31) | 85
Balance | 36,897 | 39,952
Currency Translation Adjustments |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (2,139) | (2,136)
Other comprehensive gain (loss) before reclassifications | (81) | (26)
Net other comprehensive income | (81) | (26)
Balance | (2,220) | (2,162)
Marketable Securities |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | 13 | 21
Other comprehensive gain (loss) before reclassifications | (21) | (25)
Net other comprehensive income | (21) | (25)
Balance | (8) | (4)
Cash Flow Hedges |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | 3 | (19)
Other comprehensive gain (loss) before reclassifications | (10) | 11
Amounts reclassified from accumulated other comprehensive loss | (5) | 8
Net other comprehensive income | (15) | 19
Balance | (12) |
Pension and Other Postretirement Benefit Plans |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (2,151) | (2,509)
Amounts reclassified from accumulated other comprehensive loss | 86 | 117
Net other comprehensive income | 86 | 117
Balance | (2,065) | (2,392)
Accumulated Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (4,274) | (4,643)
Balance | $ (4,305) | $ (4,558)

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