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Fair Value of Financial Instruments - Estimated Carrying Amounts and Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, including current portion $ 6,042 $ 6,691
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes receivable 12 17
Long-term debt, including current portion 5,951 6,591
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes receivable 8 14
Long-term debt, including current portion 6,422 6,697
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, including current portion 6,305 6,528
Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, including current portion $ 117 $ 169