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Financing Arrangements - Long-term debt components (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Debt    
Fair value adjustment related to hedged fixed rate debt $ 1 $ (1)
Total long-term debt 1,744 1,931
Short-term borrowings 120 169
Total debt $ 1,864 $ 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 $ 496 $ 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 $ 398 $ 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 $ 254 $ 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 395 165
Repayments of long-term debt $ 25 230
Revolving credit facility    
Debt    
Long-term debt excluding fair value adjustments   $ 418