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Financial Instruments - Cash flow hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in AOCI $ (5) $ 12  
Gain (loss) recognized in AOCI     $ (4)
Cash flow hedging | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in AOCI (2) 13  
Gain (loss) recognized in AOCI     (6)
Gain (loss) reclassified from AOCI to earnings $ 4 $ (1)  
Gain (loss) reclassified from AOCI to earnings     $ (1)