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Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Arrangements    
Total long-term debt $ 1,871 $ 1,766
Short-term borrowings 77 82
Total debt $ 1,948 $ 1,848
3.2% senior notes due October 1, 2026    
Financing Arrangements    
Debt, interest rate (as a percent) 3.20% 3.20%
Long-term debt excluding fair value adjustments $ 497 $ 497
4.625% senior notes due November 1, 2020    
Financing Arrangements    
Debt, interest rate (as a percent) 4.625% 4.625%
Long-term debt excluding fair value adjustments $ 400 $ 400
6.625% senior notes due April 15, 2037    
Financing Arrangements    
Debt, interest rate (as a percent) 6.625% 6.625%
Long-term debt excluding fair value adjustments $ 253 $ 253
5.62% senior notes due March 25, 2020    
Financing Arrangements    
Debt, interest rate (as a percent) 5.62% 5.62%
Long-term debt excluding fair value adjustments   $ 200
Repayments of long-term debt $ 200  
Term loan credit agreement due April 12, 2021    
Financing Arrangements    
Long-term debt excluding fair value adjustments 405 405
Revolving credit facility    
Financing Arrangements    
Long-term debt excluding fair value adjustments $ 312 $ 10