Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
Significant noncash items
Depreciation, depletion and amortization		$ 621		$ 622
Accrued capital expenditures	[1]	753		671
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures		65	[2]	98
Significant noncash items
Depreciation, depletion and amortization		0	[2]	35
Accrued capital expenditures				30
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures		82		44
Significant noncash items
Depreciation, depletion and amortization		0		22
Accrued capital expenditures		55		22
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures		100		85
Significant noncash items
Depreciation, depletion and amortization		0		44
Accrued capital expenditures		20		18
Other Sales | Tredegar Solar Fund I, LLC
Significant noncash items
Depreciation, depletion and amortization		$ 0		$ 1

[1] See Notes 3 and 17 for noncash financing activities related to debt assumed with closing of the East Ohio 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.