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Debt (Details) - USD ($)
$ in Millions
Apr. 12, 2019
Mar. 31, 2019
Dec. 31, 2018
Debt      
Fair value adjustment related to hedged fixed rate debt instruments     $ (1)
Total long-term debt   $ 1,957 1,931
Short-term borrowings   153 169
Total debt   $ 2,110 $ 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   $ 399 $ 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 12, 2021      
Debt      
Long-term debt excluding fair value adjustments   165 165
Term loan credit agreement due April 12, 2021 | Subsequent Event.      
Debt      
Total long-term debt $ 165    
Debt term 24 months    
Maximum borrowing capacity $ 500    
Revolving credit facility      
Debt      
Long-term debt excluding fair value adjustments   $ 443 $ 418