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Fair Value Measurements - Reported (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value $ 7,362 $ 4,953
SMR Liability, Fair Value 106 108
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 6,687 4,422
SMR Liability, Fair Value $ 93 $ 96