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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 114 $ 204 $ 256
State 91 94 132
Foreign 27 36 40
Current tax total 232 334 428
Deferred:      
Federal 149 94 59
State 10 8 (32)
Foreign 6 (2) (2)
Deferred tax total 165 100 25
Income tax expense $ 397 $ 434 $ 453