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Risk Management - Effect of Derivatives Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Foreign exchange contracts | Designated as Hedging Instrument      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivative instruments $ (7) $ 8 $ 0