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Financial Instruments, Derivatives and Hedging Activities - Foreign currency hedging (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,154) $ (1,013)
Cash Flow Hedging | Foreign Exchange Forward    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect   1
Tax effect on gain (loss) on derivative instruments   1
Fair Value Hedging | Foreign Exchange Forward    
Financial instruments, derivatives and hedging activities    
Fair value of derivative instruments 5 11
Fair Value Hedging | Foreign Exchange Forward | Short    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 621 447
Fair Value Hedging | Foreign Exchange Forward | Long    
Financial instruments, derivatives and hedging activities    
Derivative notional amount $ 165 $ 121