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Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Apr. 12, 2019
Apr. 11, 2019
Dec. 31, 2018
Debt        
Fair value adjustment related to hedged fixed rate debt instruments $ 2     $ (1)
Total long-term debt 2,001     1,931
Short-term borrowings 81     169
Total debt $ 2,082     $ 2,100
3.2% senior notes due October 1, 2026        
Debt        
Debt, interest rate (as a percent) 3.20%     3.20%
Long-term debt excluding fair value adjustments $ 497     $ 496
4.625% senior notes due November 1, 2020        
Debt        
Debt, interest rate (as a percent) 4.625%     4.625%
Long-term debt excluding fair value adjustments $ 400     $ 399
6.625% senior notes due April 15, 2037        
Debt        
Debt, interest rate (as a percent) 6.625%     6.625%
Long-term debt excluding fair value adjustments $ 253     $ 254
5.62% senior notes due March 25, 2020        
Debt        
Debt, interest rate (as a percent) 5.62%     5.62%
Long-term debt excluding fair value adjustments $ 200     $ 200
Term loan credit agreement due April 25, 2019        
Debt        
Long-term debt excluding fair value adjustments       165
Total long-term debt     $ 165  
Term loan credit agreement due April 12, 2021        
Debt        
Long-term debt excluding fair value adjustments 500      
Debt term   24 months    
Maximum borrowing capacity   $ 500    
Revolving credit facility        
Debt        
Long-term debt excluding fair value adjustments $ 149     $ 418