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Stockholders' Equity - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance $ 36,586 $ 37,261 $ 41,529
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform   (109)  
Other comprehensive income (loss) before reclassifications 162 (404) 145
Amounts reclassified from accumulated other comprehensive loss 93 183 239
Income taxes (71) (18) (15)
Balance 24,176 36,586 37,261
Currency Translation Adjustments      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (2,330) (2,139) (2,136)
Other comprehensive income (loss) before reclassifications 67 (191) (3)
Balance (2,263) (2,330) (2,139)
Marketable Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance 2 13 21
Other comprehensive income (loss) before reclassifications   (11) (8)
Balance 2 2 13
Cash Flow Hedges      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (12) 3 (19)
Other comprehensive income (loss) before reclassifications (32) (16) 22
Amounts reclassified from accumulated other comprehensive loss 10 1  
Balance (34) (12) 3
Pension and Other Postretirement Benefit Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (2,282) (2,151) (2,509)
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform   (109)  
Other comprehensive income (loss) before reclassifications 127 (186) 134
Amounts reclassified from accumulated other comprehensive loss 83 182 239
Income taxes (71) (18) (15)
Balance (2,143) (2,282) (2,151)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (4,622) (4,274) (4,643)
Reclassification to Retained Earnings of stranded tax effects resulting from US tax reform   (109)  
Balance $ (4,438) $ (4,622) $ (4,274)