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Financing Agreements - Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal $ 1,606 $ 1,591
Unamortized Debt Issue Costs $ (21) $ (21)
Senior Notes Due February 2021 [Member]    
Debt Instrument [Line Items]    
Interest rate 6.75% 6.75%
Principal $ 350 $ 350
Unamortized Debt Issue Costs $ (4) $ (4)
Senior Notes Due September 2021 [Member]    
Debt Instrument [Line Items]    
Interest rate 5.375% 5.375%
Principal $ 450 $ 450
Unamortized Debt Issue Costs $ (6) $ (6)
Senior Notes Due September 2023 [Member]    
Debt Instrument [Line Items]    
Interest rate 6.00% 6.00%
Principal $ 300 $ 300
Unamortized Debt Issue Costs $ (4) $ (5)
Senior Notes Due December 2024 [Member]    
Debt Instrument [Line Items]    
Interest rate 5.50% 5.50%
Principal $ 425 $ 425
Unamortized Debt Issue Costs (6) (6)
Other indebtedness [Member]    
Debt Instrument [Line Items]    
Principal 81 $ 66
Unamortized Debt Issue Costs $ (1)