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Financial Instruments, Derivatives and Hedging Activities - Foreign currency hedging (Details) - Foreign Currency Forward Contracts - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Short | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount $ 648 $ 621
Long | Not Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 457 356
Cash Flow Hedging | Short | Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 495 374
Cash Flow Hedging | Long | Designated as Hedging Instrument    
Financial instruments, derivatives and hedging activities    
Derivative notional amount $ 619 $ 541