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Debt (Short-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Document Fiscal Year Focus 2014  
Short-term debt and current portion of long-term debt    
Short-term Debt $ 167 $ 15
Short-term debt and current portion of long-term debt 167 15
Seven Year Term Loan Facility [Member]    
Short-term debt and current portion of long-term debt    
Current portion of 7-year term loan facility expires 2018 $ 17 15
Maturity period of debt instrument 7 years  
Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]    
Short-term debt and current portion of long-term debt    
Senior Notes, Current $ 148 0
Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]    
Short-term debt and current portion of long-term debt    
Senior Notes, Current 1 0
Term Loan Facility Expires Twenty Fifteen [Member]    
Short-term debt and current portion of long-term debt    
Current portion of 7-year term loan facility expires 2018 $ 1 $ 0
Maturity period of debt instrument 3 years