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Financial Instruments - Schedule of Gain (Loss) on Derivative Instruments Reclassified From OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gain (loss) recorded in Accumulated other comprehensive income (loss) $ 4 $ (3)