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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Currently payable      
Federal $ 534 $ 698 $ 1,022
State 59 109 59
International 673 763 722
Tax Cuts and Jobs Act (TCJA) non-current transition tax provision   176 623
Deferred      
Federal (32) (38) 162
State (26) (17) 15
International (78) (54) 76
Total provision for income taxes $ 1,130 $ 1,637 $ 2,679