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Debt Debt Fair Value Adjustments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Amortization Period of Deferred Gain (Loss) on Discontinuation of Fair Value Hedge 15 years  
Purchase accounting debt fair value adjustments $ 599 $ 658
Carrying value adjustment to hedged debt 359 2
Unamortized portion of proceeds received from the early termination of interest rate swap agreements(a) 257 275
Unamortized debt discounts, net (67) (74)
Unamortized debt issuance costs (116) (130)
Total debt fair value adjustments $ 1,032 $ 731