Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023
Significant noncash items
Depreciation, depletion and amortization		$ 621	$ 607	$ 1,242		$ 1,229
Accrued capital expenditures	[1]			929		713
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures				65	[2]	215
Significant noncash items
Depreciation, depletion and amortization				0	[2]	71
Accrued capital expenditures						48
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures				189		99
Significant noncash items
Depreciation, depletion and amortization				0		44
Accrued capital expenditures				57		19
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures				160	[2]	177
Significant noncash items
Depreciation, depletion and amortization				0	[2]	86
Accrued capital expenditures						32
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 and the Questar Gas 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 and the Questar Gas Transaction which closed on May 31, 2024, respectively.