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Derivative and Hedging Activities Derivative and Hedging Activities, Marketing, Gathering and Compression Sales (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]        
Marketing, gathering and compression revenues $ 1,099 $ 2,013 $ 3,241 $ 5,993
Gains (losses) on undesignated supply contract derivatives 0 0 0 10
Total marketing, gathering and compression revenues 1,099 2,013 3,241 5,993
Marketing, Gathering And Compression [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Marketing, gathering and compression revenues 1,379 1,943 3,538 5,703
Gains (losses) on undesignated supply contract derivatives (280) 70 (297) 290
Total marketing, gathering and compression revenues $ 1,379 $ 1,943 $ 3,538 $ 5,703