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Financing Arrangements - Carrying amount and Fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Apr. 12, 2019
Apr. 11, 2019
Dec. 31, 2018
Financing Arrangements        
Fair value adjustment related to hedged fixed rate debt instruments $ 1     $ (1)
Total long-term debt 1,766     1,931
Short-term borrowings 82     169
Total debt 1,848     2,100
Long-term debt, Fair value 1,751     1,954
Total debt, Fair Value 1,833     2,123
Long-term debt $ 1,833     $ 2,123
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     $ 496
Long-term debt, Fair value $ 491     $ 462
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     $ 399
Long-term debt, Fair value $ 399     $ 409
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     $ 254
Long-term debt, Fair value $ 246     $ 295
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     $ 200
Long-term debt, Fair value 200     205
Term loan credit agreement due April 25, 2019        
Financing Arrangements        
Long-term debt excluding fair value adjustments     $ 165 165
Long-term debt, Fair value       165
Term loan credit agreement due April 12, 2021        
Financing Arrangements        
Long-term debt excluding fair value adjustments 405 $ 500    
Long-term debt, Fair value 405      
Revolving credit facility        
Financing Arrangements        
Long-term debt excluding fair value adjustments 10     418
Long-term debt, Fair value 10     $ 418
Maximum borrowing capacity $ 1,000