Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Mar. 31, 2024		Dec. 31, 2023
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	$ 685		$ 753
Total noncurrent derivative assets		759	[2]	597	[3]
Total derivative assets		1,444		1,350
Total current derivative liabilities	[4]	343		376
Total noncurrent derivative liabilities	[3]	479		321
Total derivative liabilities		822		697
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	183		234
Total noncurrent derivative assets		96	[2]	64	[3]
Total derivative assets		279		298
Total current derivative liabilities	[4]	192		244
Total noncurrent derivative liabilities	[3]	97		72
Total derivative liabilities		289		316
Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		256		312
Total noncurrent derivative assets		290		238
Total current derivative liabilities		191		244
Total noncurrent derivative liabilities		40		55
Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		86		91
Total noncurrent derivative assets		18		26
Total current derivative liabilities		136		188
Total noncurrent derivative liabilities		24		44
Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		426		441
Total noncurrent derivative assets		469		359
Total current derivative liabilities		117		121
Total noncurrent derivative liabilities		366		238
Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		94		143
Total noncurrent derivative assets		78		38
Total current derivative liabilities		21		45
Total noncurrent derivative liabilities		0		0
Foreign currency exchange rate
Derivatives Fair Value [Line Items]
Total current derivative assets		3
Total current derivative liabilities		35		11
Total noncurrent derivative liabilities		73		28
Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		3
Total current derivative liabilities		35		11
Total noncurrent derivative liabilities		73		28
Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	94		143
Total noncurrent derivative assets		78	[2]	38	[3]
Total derivative assets		172		181
Total current derivative liabilities	[4]	21		45
Total noncurrent derivative liabilities	[3]	0		0
Total derivative liabilities		21		45
Designated as Hedging Instrument | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	94		143
Total noncurrent derivative assets		78	[2]	38	[3]
Total derivative assets		172		181
Total current derivative liabilities	[4]	21		45
Total noncurrent derivative liabilities	[3]	0		0
Total derivative liabilities		21		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		94		143
Total noncurrent derivative assets		78		38
Total current derivative liabilities		21		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		94		143
Total noncurrent derivative assets		78		38
Total current derivative liabilities		21		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]	591		610
Total noncurrent derivative assets		681	[2]	559	[3]
Total derivative assets		1,272		1,169
Total current derivative liabilities	[4]	322		331
Total noncurrent derivative liabilities	[3]	479		321
Total derivative liabilities		801		652
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	89		91
Total noncurrent derivative assets		18	[2]	26	[3]
Total derivative assets		107		117
Total current derivative liabilities	[4]	171		199
Total noncurrent derivative liabilities	[3]	97		72
Total derivative liabilities		268		271
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		256		312
Total noncurrent derivative assets		290		238
Total current derivative liabilities		191		244
Total noncurrent derivative liabilities		40		55
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		86		91
Total noncurrent derivative assets		18		26
Total current derivative liabilities		136		188
Total noncurrent derivative liabilities		24		44
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		332		298
Total noncurrent derivative assets		391		321
Total current derivative liabilities		96		76
Total noncurrent derivative liabilities		366		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		3
Total current derivative liabilities		35		11
Total noncurrent derivative liabilities		73		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		3
Total current derivative liabilities		35		11
Total noncurrent derivative liabilities		$ 73		$ 28

[1] Includes $23 million and $54 million recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets at March 31, 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] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.

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