Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Jun. 30, 2024	Dec. 31, 2023
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	$ 749	$ 753
Total noncurrent derivative assets	[2]	835	597
Total derivative assets		1,584	1,350
Total current derivative liabilities	[3]	318	376
Total noncurrent derivative liabilities	[4]	521	321
Total derivative liabilities		839	697
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	275	234
Total noncurrent derivative assets	[2]	114	64
Total derivative assets		389	298
Total current derivative liabilities	[3]	124	244
Total noncurrent derivative liabilities	[4]	75	72
Total derivative liabilities		199	316
Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		288	312
Total noncurrent derivative assets		297	238
Total current derivative liabilities		123	244
Total noncurrent derivative liabilities		68	55
Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		166	91
Total noncurrent derivative assets		14	26
Total current derivative liabilities		61	188
Total noncurrent derivative liabilities		15	44
Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		461	441
Total noncurrent derivative assets		537	359
Total current derivative liabilities		143	121
Total noncurrent derivative liabilities		393	238
Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		109	143
Total noncurrent derivative assets		99	38
Total current derivative liabilities		11	45
Total noncurrent derivative liabilities		0	0
Foreign currency exchange rate
Derivatives Fair Value [Line Items]
Total current derivative assets		1
Total current derivative liabilities		52	11
Total noncurrent derivative liabilities		60	28
Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		1
Total current derivative liabilities		52	11
Total noncurrent derivative liabilities		60	28
Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	109	143
Total noncurrent derivative assets	[2]	99	38
Total derivative assets		208	181
Total current derivative liabilities	[3]	11	45
Total noncurrent derivative liabilities	[4]	0	0
Total derivative liabilities		11	45
Designated as Hedging Instrument | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	109	143
Total noncurrent derivative assets	[2]	99	38
Total derivative assets		208	181
Total current derivative liabilities	[3]	11	45
Total noncurrent derivative liabilities	[4]	0	0
Total derivative liabilities		11	45
Designated as Hedging Instrument | Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		0	0
Total noncurrent derivative assets		0	0
Total current derivative liabilities		0	0
Total noncurrent derivative liabilities		0	0
Designated as Hedging Instrument | Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		0	0
Total noncurrent derivative assets		0	0
Total current derivative liabilities		0	0
Total noncurrent derivative liabilities		0	0
Designated as Hedging Instrument | Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		109	143
Total noncurrent derivative assets		99	38
Total current derivative liabilities		11	45
Total noncurrent derivative liabilities		0	0
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		109	143
Total noncurrent derivative assets		99	38
Total current derivative liabilities		11	45
Total noncurrent derivative liabilities		0	0
Designated as Hedging Instrument | Foreign currency exchange rate
Derivatives Fair Value [Line Items]
Total current derivative assets		0
Total current derivative liabilities		0	0
Total noncurrent derivative liabilities		0	0
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		0
Total current derivative liabilities		0	0
Total noncurrent derivative liabilities		0	0
Fair Value - Derivatives not under Hedge Accounting
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	640	610
Total noncurrent derivative assets	[2]	736	559
Total derivative assets		1,376	1,169
Total current derivative liabilities	[3]	307	331
Total noncurrent derivative liabilities	[4]	521	321
Total derivative liabilities		828	652
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	166	91
Total noncurrent derivative assets	[2]	15	26
Total derivative assets		181	117
Total current derivative liabilities	[3]	113	199
Total noncurrent derivative liabilities	[4]	75	72
Total derivative liabilities		188	271
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		288	312
Total noncurrent derivative assets		297	238
Total current derivative liabilities		123	244
Total noncurrent derivative liabilities		68	55
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		166	91
Total noncurrent derivative assets		14	26
Total current derivative liabilities		61	188
Total noncurrent derivative liabilities		15	44
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		352	298
Total noncurrent derivative assets		438	321
Total current derivative liabilities		132	76
Total noncurrent derivative liabilities		393	238
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		0	0
Total noncurrent derivative assets		0	0
Total current derivative liabilities		0	0
Total noncurrent derivative liabilities		0	0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate
Derivatives Fair Value [Line Items]
Total current derivative assets		1
Total current derivative liabilities		52	11
Total noncurrent derivative liabilities		60	28
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		1
Total current derivative liabilities		52	11
Total noncurrent derivative liabilities		$ 60	$ 28

[1] Includes $21 million and $54 million recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets at June 30, 2024 and December 31, 2023, respectively, with the remaining current derivative assets presented in other current assets in the Companies’ Consolidated Balance Sheets.

[2] Noncurrent derivative assets are presented in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.

[3] Includes less than $1 million and $30 million recorded in current liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets at June 30, 2024 and December 31, 2023, respectively.

[4] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.