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Share-Based Compensation - Equity-Classified Compensation Table (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 16 $ 24
General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 8 12
Oil and Gas Properties [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 4 7
Oil, Natural Gas and NGL Production Expenses Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 3 4
Marketing, Gathering and Compression Expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 1 $ 1