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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 256 $ 400 $ 443
State 132 56 88
Foreign 40 37 38
Current tax total 428 493 569
Deferred:      
Federal 59 (316) 57
State (32) 62 17
Foreign (2) 3 (1)
Deferred tax total 25 (251) 73
Income tax expense $ 453 $ 242 $ 642