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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Equity [Abstract]          
Common stock, shares authorized 1,500,000,000   1,500,000,000   1,000,000,000
Common stock, par value (usd per share) $ 0.01   $ 0.01   $ 0.01
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Total oil, natural gas and NGL revenues $ 1,177 $ 1,363 $ 2,610 $ 4,122  
Commodity Contract [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Total oil, natural gas and NGL revenues $ 7 $ 5 $ 21 $ 18