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Derivative and Hedging Activities - Natural Gas and Oil Sales Table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Oil, natural gas and NGL revenues $ 1,177 $ 1,363 $ 2,610 $ 4,122
Gains (losses) on undesignated oil, natural gas and NGL derivatives 0 0 0 10
Total oil, natural gas and NGL revenues 1,177 1,363 2,610 4,122
Oil, Natural Gas and NGL [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Oil, natural gas and NGL revenues 1,048 1,136 2,744 3,782
Gains (losses) on undesignated oil, natural gas and NGL derivatives 136 234 (110) 369
Losses on terminated cash flow hedges (7) (7) (24) (29)
Total oil, natural gas and NGL revenues $ 1,048 $ 1,136 $ 2,744 $ 3,782