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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Liabilities:    
Carrying value of debt, net of unamortized discount $ 9,800 $ 9,800
Level 2    
Liabilities:    
Debt estimated fair value   68
Fair Value    
Liabilities:    
Debt estimated fair value 10,200 10,100
Recurring | Level 2 | Accrued liabilities    
Liabilities:    
Embedded derivative 43 53
Recurring | Level 2 | Deferred credits and liabilities    
Liabilities:    
Embedded derivative 178 204
Recurring | Fair Value | Accrued liabilities    
Liabilities:    
Embedded derivative 43 53
Recurring | Fair Value | Deferred credits and liabilities    
Liabilities:    
Embedded derivative 178 $ 204
Non recurring | Proved gas and oil properties    
Liabilities:    
Pre-tax Impairment Charges $ 15