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Financial Instruments, Derivatives and Hedging Activities - Foreign currency hedging (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,152) $ (1,154)
Foreign Currency Forward Contracts | Short | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 612 621
Foreign Currency Forward Contracts | Long | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 190 165
Cash Flow Hedging | Foreign Currency Forward Contracts    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect 2  
Tax effect on gain (loss) of derivative instruments (1)  
Cash Flow Hedging | Foreign Currency Forward Contracts | Short    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 220 345
Cash Flow Hedging | Foreign Currency Forward Contracts | Long    
Financial instruments, derivatives and hedging activities    
Derivative notional amount $ 366 $ 275