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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Impairment of assets and other charges (benefit) $ 321 $ 44 $ 416 $ 812
Supply Header Project | GT&S Transaction        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Impairment of assets and other charges (benefit)   482    
Asset impairment charges after tax   359    
Atlantic Coast Pipeline Project | GT&S Transaction        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Asset retirement obligations   $ 75   $ 75