Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Significant noncash items
Depreciation and amortization		$ 2,580	$ 2,442	$ 2,117
Accrued capital expenditures	[1],[2]	1,085	979	637
Enbridge | East Ohio
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures		507	456	420	[3]
Significant noncash items
Depreciation and amortization		148	134	122
Accrued capital expenditures		42	53	27
Enbridge | PSNC
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures		233	153	195	[3]
Significant noncash items
Depreciation and amortization		90	87	81
Accrued capital expenditures		43	16	41
Enbridge | Questar Gas and Wexpro
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures		449	438	416	[3]
Significant noncash items
Depreciation and amortization		175	163	168
Accrued capital expenditures		32	31	25
Tredegar Solar Fund I, LLC | Other Sales
Significant noncash items
Depreciation and amortization		$ 2	$ 4	4
Dominion Energy Gas Holdings, LLC | Q-Pipe Group
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures				$ 34

[1] See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler and Dominion Privatization.

[2] See Notes 18, 19, 20 and 23 for noncash financing activities related to the contribution of stock to Dominion Energy’s defined benefit pension plan, remarketing of Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.

[3] In November 2021, Wexpro closed on an agreement with a natural gas gathering systems operator to purchase an existing natural gas gathering system in Wyoming including pipelines, compressors and dehydration equipment for total consideration of $41 million, included in the Questar Gas Transaction.