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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)