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Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt    
Fair value adjustment related to hedged fixed rate debt $ (2) $ 1
Long-term debt 1,512 1,744
Short-term borrowings 140 120
Total debt 1,652 1,864
Senior Notes 3.2 Percent Due October 1, 2026    
Debt    
Long-term debt $ 496 $ 496
Debt, interest rate (as a percent) 3.20% 3.20%
Senior Notes 4.625 Percent Due November 1, 2020    
Debt    
Long-term debt $ 399 $ 398
Debt, interest rate (as a percent) 4.625% 4.625%
Senior Notes 6.625 Percent Due April 15, 2037    
Debt    
Long-term debt $ 254 $ 254
Debt, interest rate (as a percent) 6.625% 6.625%
Senior Notes 5.62 Percent Due March 25, 2020    
Debt    
Long-term debt $ 200 $ 200
Debt, interest rate (as a percent) 5.62% 5.62%
Term loan credit agreement    
Debt    
Long-term debt $ 165 $ 395
Debt repaid $ 230