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Income Taxes - Pretax Income and Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ (25) $ 25 $ 189
State 71 69 39
Foreign 79 57 17
Total current 125 151 245
Deferred:      
Federal 189 118 110
State (34) (18) 24
Foreign (84) (53) (1)
Total deferred 71 47 133
Income tax provision $ 196 $ 198 $ 378