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Financial Instruments - Fair Value Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Gain/(loss) recognized in income on fair value of hedges $ 0 $ 0 $ 0
Borrowings      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain/(loss) recognized in income on fair value of hedges 1 4 6
Derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain/(loss) recognized in income on fair value of hedges $ (1) $ (4) $ (6)