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Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Significant noncash items        
Depreciation, depletion and amortization $ 549 $ 667 $ 1,791 $ 1,896
Accrued capital expenditures [1]     930 884
East Ohio | Enbridge        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures     65 [2] 355
Significant noncash items        
Depreciation, depletion and amortization     0 [2] 109
Accrued capital expenditures       53
PSNC | Enbridge        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures     287 [2] 153
Significant noncash items        
Depreciation, depletion and amortization     0 [2] 67
Accrued capital expenditures       22
Questar Gas and Wexpro | Enbridge        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures     160 [2] 290
Significant noncash items        
Depreciation, depletion and amortization     0 [2] 130
Accrued capital expenditures       33
Other Sales        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures     0  
Significant noncash items        
Depreciation, depletion and amortization     $ 0  
Other Sales | Tredegar Solar Fund I, LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures       0
Significant noncash items        
Depreciation, depletion and amortization       2
Accrued capital expenditures       $ 0
[1] See Notes 3 and 17 for noncash financing activities related to debt assumed with closing of the East Ohio Transaction, the Questar Gas Transaction and the PSNC Transaction and the transfer of property associated with the settlement of litigation.
[2] Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction which closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024, respectively.