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Operations And Organization Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
 [1]
Jun. 30, 2020
Jun. 30, 2019
 [1]
Dec. 31, 2019
Dec. 31, 2018
Goodwill, Impairment Loss   $ 1,325          
Lease, Right of Use Asset, Net $ 1,112     $ 1,112   $ 964 [1]  
Goodwill 3,868 3,835   3,868   5,167 [1]  
Goodwill Test, Fair Value Exceeding the Carrying Value of Goodwill by Less Than 20% 1,200     $ 1,200      
Document Period End Date       Jun. 30, 2020      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 672   $ 1,209 $ (292) $ 2,327 4,825 $ 3,420
COVID-19 [Member]              
Accounts Receivable, Credit Loss Expense (Reversal)       16      
Midstream [Member]              
Goodwill, Impairment Loss   483          
Goodwill 0 0   0   483  
Investment In USAC [Member]              
Goodwill, Impairment Loss   619          
Goodwill 0 0   0   619  
Interstate Transportation and Storage [Member]              
Goodwill, Impairment Loss   183          
Goodwill 43 43   43   226  
Other Segments [Member]              
Goodwill, Impairment Loss   40   40      
Goodwill 170 $ 137   $ 170   $ 184  
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]              
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 265            
[1]
*As adjusted. See Note 1.