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Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt $ 62 $ 11
Long-term debt 4,422 3,376
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 62 11
Long-term debt $ 4,542 $ 3,493