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Accumulated Other Comprehensive Loss - Components of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Revenue $ 2,132 $ 2,106 $ 4,072 $ 3,901
Tax effect 373 (5) 383 (8)
Net income (loss) attributable to Company (5,389) 24 (5,466) (44)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Revenue 1   1 (1)
Cost of revenue 2 (1) 3 (5)
Tax effect (1)   (1) 2
Net income (loss) attributable to Company 2 (1) 3 (4)
Derivative Financial Instruments, Net of Tax [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Revenue 1   1 (1)
Cost of revenue 2 (1) 3 (5)
Tax effect (1)   (1) 2
Net income (loss) attributable to Company $ 2 $ (1) $ 3 $ (4)