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Income Taxes - Income Before Income Taxes and Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of Income Before Income Taxes      
U.S. $ 663 $ 2,482 $ 1,739
Foreign (2) 683 767
Income Before Income Taxes 661 3,165 2,506
Current tax expense (benefit)      
Federal (20) (2) (22)
State 9 10 (45)
Foreign(a) 147 201 249
Total 136 209 182
Deferred tax expense (benefit)      
Federal 440 682 425
State 49 66 55
Foreign(a) (144) (31) (75)
Total 345 717 405
Total 481 926 587
Canada      
Components of Income Tax Provision      
Foreign income tax expense $ (4) $ 165 $ 168