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Operations And Organization Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
 [1]
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
 [1]
Jun. 30, 2020
Dec. 31, 2019
Goodwill, Impairment Loss $ 1,454 $ 1,325            
Lease, Right of Use Asset, Net 934       $ 934     $ 964 [1]
Goodwill 2,418 3,835     $ 2,418   $ 3,868 5,167 [1]
Document Period End Date         Sep. 30, 2020      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (401) 4,825 $ 1,187 $ 3,420 $ (693) $ 3,514    
COVID-19 [Member]                
Accounts Receivable, Credit Loss Expense (Reversal)         16      
Midstream [Member]                
Goodwill, Impairment Loss 0 483            
Goodwill 0 0     0   0 483
Investment In USAC [Member]                
Goodwill, Impairment Loss 0 619            
Goodwill 0 0     0   0 619
Interstate Transportation and Storage [Member]                
Goodwill, Impairment Loss 43 183            
Goodwill 0 43     0   43 226
Other Segments [Member]                
Goodwill, Impairment Loss 132 40            
Goodwill 108 137     108   170 184
Crude oil transportation and services [Member]                
Goodwill, Impairment Loss 1,279 0            
Goodwill 52 $ 1,397     $ 52   $ 1,397 $ 1,397
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.