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Financial Instruments, Derivatives and Hedging Activities - Interest rate hedging (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,214) $ (1,154)
4.625% senior notes due November 1, 2020    
Financial instruments, derivatives and hedging activities    
Debt, face amount 400  
Treasury Lock    
Financial instruments, derivatives and hedging activities    
Derivative notional amount 0 0
Cash Flow Hedging | Treasury Lock    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect (1) (2)
Tax effect on gain (loss) of derivative instruments 1 1
Fair Value Hedging | Interest Rate Swap    
Financial instruments, derivatives and hedging activities    
Increase (decrease) in fair value of instrument 2 $ (1)
Fair Value Hedging | Interest Rate Swap | 4.625% senior notes due November 1, 2020    
Financial instruments, derivatives and hedging activities    
Debt, face amount $ 200  
Debt, fixed interest rate (as a percent) 4.625%  
Debt, floating rate of interest basis six-month U.S. dollar London Interbank Offered Rate (“LIBOR”)