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Financing Agreements - Long Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Principal $ 1,591 $ 1,659
Unamortized Debt Issue Costs $ (21) (25)
Senior Notes Due February 2019 [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.50%  
Principal $ 0 55
Unamortized Debt Issue Costs $ 0 (1)
Senior Notes Due February 2021 [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.75%  
Principal $ 350 350
Unamortized Debt Issue Costs $ (4) (5)
Senior Notes Due September 2021 [Member]    
Debt Instrument [Line Items]    
Interest Rate 5.375%  
Principal $ 450 450
Unamortized Debt Issue Costs $ (6) (7)
Senior Notes Due September 2023 [Member]    
Debt Instrument [Line Items]    
Interest Rate 6.00%  
Principal $ 300 300
Unamortized Debt Issue Costs $ (5) (5)
Senior Notes Due December 2024 [Member]    
Debt Instrument [Line Items]    
Interest Rate 5.50%  
Principal $ 425 425
Unamortized Debt Issue Costs (6) (7)
Other Indebtedness    
Debt Instrument [Line Items]    
Principal $ 66 $ 79