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Fair Value Measurements - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 20 $ 20
Long-term debt, including current maturities 1,910 1,933
Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 20 20
Long-term debt, including current maturities $ 2,001 $ 2,008