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Financial Instruments - Derivatives and hedging (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Assets, fair value $ 212 $ 318
Liabilities, fair value (196) (375)
Currency exchange contracts | Designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Assets, fair value 10 2
Liabilities, fair value 0 (9)
Currency exchange contracts | Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Assets, fair value 202 316
Liabilities, fair value $ (196) $ (366)