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Share-Based Compensation - Liability-Classified Compensation Table (Details) - Performance Shares [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 7 $ (3) $ 11 $ (34)
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 7 (2) 10 (16)
Restructuring Charges [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 0 (1) 1 (16)
Marketing, Gathering and Compression Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 0 0 0 (1)
Oil and Gas Properties [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 0 $ 0 $ 0 $ (1)