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Derivative and Hedging Activities - Marketing Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Revenues $ 672 $ 1,003 $ 2,006 $ 3,412
Losses on undesignated marketing natural gas derivatives (161) 167 573 141
Revenues 975 2,087 4,037 6,669
Marketing, Gathering and Compression | Other contract        
Derivative [Line Items]        
Losses on undesignated marketing natural gas derivatives 0 0 0 (4)
Marketing | Marketing, Gathering and Compression        
Derivative [Line Items]        
Revenues 448 889 1,412 3,042
Marketing        
Derivative [Line Items]        
Revenues   805 1,344 2,773
Losses on undesignated marketing natural gas derivatives       (3)
Revenues $ 448 $ 889 $ 1,412 $ 3,038