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Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Document Fiscal Year Focus 2014    
Long - term debt      
Long-term debt $ 2,142 $ 2,311  
Analysis of interest expense      
Total interest expense 135 126 $ 128
Revolving Credit Facility [Member]      
Long - term debt      
Revolving credit facility 0 0  
Seven Year Term Loan Facility [Member]      
Long - term debt      
Long term debt $ 242 259  
Maturity period of debt instrument 7 years    
Analysis of interest expense      
Total interest expense $ 5 6 6
5.625% senior notes due 2015      
Long - term debt      
Long-term debt $ 0 $ 148  
Interest rate on debt 5.625% 5.625%  
Analysis of interest expense      
Total interest expense $ 8 $ 12 12
Fair Value adjustment on 5.625% senior notes due 2015 [Member]      
Long - term debt      
Long-term debt $ 0 4  
Interest rate on debt 5.625%    
4.125% senior notes due 2016 [Member]      
Long - term debt      
Long-term debt $ 299 299  
Interest rate on debt 4.125%    
Analysis of interest expense      
Total interest expense $ 13 13 13
6.200% senior notes due 2017 [Member]      
Long - term debt      
Long-term debt $ 394 $ 394  
Interest rate on debt 6.20% 6.20%  
Analysis of interest expense      
Total interest expense $ 25 $ 33 38
7.000% senior notes due 2019 [Member]      
Long - term debt      
Long-term debt $ 187 $ 187  
Interest rate on debt 7.00% 7.00%  
Analysis of interest expense      
Total interest expense $ 14 $ 18 21
5.750% senior notes due 2021 [Member]      
Long - term debt      
Long-term debt $ 497 496  
Interest rate on debt 5.75%    
4.625% Senior Notes Due 2023 [Member]      
Long - term debt      
Long-term debt $ 249 $ 249  
Interest rate on debt 4.625% 4.625%  
Analysis of interest expense      
Total interest expense $ 11 $ 4 0
Six Point One Two Five Percent Senior Notes Due Two Thousand Forty Three [Member]      
Long - term debt      
Long-term debt $ 274 274  
Interest rate on debt 6.125%    
Analysis of interest expense      
Total interest expense $ 16 6 0
Term Loan Facility Expires Twenty Fifteen [Member]      
Long - term debt      
Long term debt $ 0 1  
Maturity period of debt instrument 3 years    
Other [Member]      
Analysis of interest expense      
Total interest expense $ 6 $ 3 $ 8