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Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 23 $ (79) $ 30
State 1 (4) (58)
Foreign 161 74 464
Total current income tax provision 185 (9) 436
Deferred:      
Federal (332) (132) (41)
State (2) (7) (38)
Foreign (7) (59) (179)
Total deferred income tax provision (341) (198) (258)
Total income tax provision $ (156) $ (207) $ 178