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Debt (Revolving Credit) (Details) - USD ($)
$ in Millions
3 Months Ended
May. 28, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Apr. 27, 2015
Revolving Credit Facility          
Debt          
Maximum commitment   $ 2,000      
Borrowing base   1,000     $ 750
Borrowings outstanding   $ 902   $ 902  
Weighted average interest rate (as a percent)   5.10% 2.60%    
Revolving Credit Facility | Minimum          
Debt          
Percentage of the PV-9 of the borrowing base properties on which obligations and the guarantees will be secured by a lien   80.00%      
Revolving Credit Facility | Alternate Base Rate | Minimum          
Debt          
Variable interest margin (as a percent) 0.50%        
Revolving Credit Facility | Alternate Base Rate | Maximum          
Debt          
Variable interest margin (as a percent) 1.50%        
Revolving Credit Facility | Variable Rate Base Adjusted Eurodollar | Minimum          
Debt          
Variable interest margin (as a percent) 1.50%        
Revolving Credit Facility | Variable Rate Base Adjusted Eurodollar | Maximum          
Debt          
Variable interest margin (as a percent) 2.50%        
Revolving Credit Facility | Federal Funds Effective rate          
Debt          
Variable interest margin (as a percent) 0.50%        
Revolving Credit Facility | Eurodollar rate          
Debt          
Variable interest margin (as a percent) 1.00%        
Letters of credit          
Debt          
Maximum commitment   $ 100