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Income Taxes - Significant Components of Provision for Income Taxes Attributable to Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income tax provision:      
Federal taxes $ 1,207 $ 210 $ 1,585
State taxes 301 234 223
International taxes 129 135 133
Total current provision 1,637 579 1,941
Deferred income tax (benefit) provision:      
Federal taxes (222) 620 1,509
State taxes (45) 115 (69)
International taxes (29) (21) (6)
Total deferred (benefit) provision (296) 714 1,434
Income tax provision (benefit) $ 1,341 $ 1,293 $ 3,375