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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 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Impairment of assets and other charges $ 1,151   $ 85 $ 1,963 $ 1,219
Gas, Transmission & Storage          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Loss associated with cash flow hedges of debt-related items $ 237        
Supply Header Project | Gas, Transmission & Storage          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Impairment of assets and other charges   $ 482      
Asset impairment charges after tax   359      
Atlantic Coast Pipeline Project | Gas, Transmission & Storage          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Asset retirement obligations   $ 75