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Financial Instruments - Impact of Changes in Fair Value of Fair Value Hedges and Not Designated as Hedging Instruments on Earnings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest expense | Fair Value Hedges | Interest rate contracts      
Fair Value Hedges      
Interest rate derivatives, fair value hedges $ 31 $ 31 $ 9
Other, Net | Foreign exchange contracts | Derivatives not designated as hedging instruments      
Not Designated as Hedges      
Foreign exchange contracts, not designated as hedges $ 86 $ (73) $ 68