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Financial Instruments, Derivatives and Hedging Activities - Foreign currency hedging (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,158) $ (1,154)
Foreign Currency Forward Contracts | Short | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 621 621
Foreign Currency Forward Contracts | Long | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 356 165
Cash Flow Hedging    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect (9) (4)
Cash Flow Hedging | Foreign Currency Forward Contracts | Short | Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 374 345
Cash Flow Hedging | Foreign Currency Forward Contracts | Long | Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount $ 541 $ 275