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Financial Instruments - Derivatives and hedging (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Assets, fair value $ 221 $ 150
Liabilities, fair value (248) (95)
Currency exchange contracts | Designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Assets, fair value 2 6
Liabilities, fair value (1) 0
Currency exchange contracts | Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Assets, fair value 219 144
Liabilities, fair value $ (247) $ (95)