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Financial Instruments, Derivatives and Hedging Activities - Interest rate hedging (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
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
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”)