Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	$ 753	$ 1,137
Total noncurrent derivative assets	[2]	597	1,039	[3]
Total derivative assets		1,350	2,176
Total current derivative liabilities	[4]	376	778
Total noncurrent derivative liabilities	[5]	321	626	[6]
Total derivative liabilities		697	1,404
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	234	765
Total noncurrent derivative assets	[2]	64	117	[3]
Total derivative assets		298	882
Total current derivative liabilities	[4]	244	298
Total noncurrent derivative liabilities	[5]	72	158	[6]
Total derivative liabilities		316	456
Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		312	532
Total noncurrent derivative assets		238	237
Total current derivative liabilities		244	700
Total noncurrent derivative liabilities		55	226
Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		91	264
Total noncurrent derivative assets		26	4
Total current derivative liabilities		188	290
Total noncurrent derivative liabilities		44	58
Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		441	605
Total noncurrent derivative assets		359	802
Total current derivative liabilities		121	70
Total noncurrent derivative liabilities		238	307
Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		143	501
Total noncurrent derivative assets		38	113
Total current derivative liabilities		45	0
Total noncurrent derivative liabilities		0	7
Foreign currency exchange rate
Derivatives Fair Value [Line Items]
Total current derivative liabilities		11	8
Total noncurrent derivative liabilities		28	93
Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative liabilities		11	8
Total noncurrent derivative liabilities		28	93
Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	143	501
Total noncurrent derivative assets	[2]	38	113	[3]
Total derivative assets		181	614
Total current derivative liabilities	[4]	45	0
Total noncurrent derivative liabilities	[5]	0	7	[6]
Total derivative liabilities		45	7
Designated as Hedging Instrument | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	143	501
Total noncurrent derivative assets	[2]	38	113	[3]
Total derivative assets		181	614
Total current derivative liabilities	[4]	45	0
Total noncurrent derivative liabilities	[5]	0	7	[6]
Total derivative liabilities		45	7
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		143	501
Total noncurrent derivative assets		38	113
Total current derivative liabilities		45	0
Total noncurrent derivative liabilities		0	7
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		143	501
Total noncurrent derivative assets		38	113
Total current derivative liabilities		45	0
Total noncurrent derivative liabilities		0	7
Designated as Hedging Instrument | Foreign currency exchange rate
Derivatives Fair Value [Line Items]
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 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]	610	636
Total noncurrent derivative assets	[2]	559	926	[3]
Total derivative assets		1,169	1,562
Total current derivative liabilities	[4]	331	778
Total noncurrent derivative liabilities	[5]	321	619	[6]
Total derivative liabilities		652	1,397
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets	[1]	91	264
Total noncurrent derivative assets	[2]	26	4	[3]
Total derivative assets		117	268
Total current derivative liabilities	[4]	199	298
Total noncurrent derivative liabilities	[5]	72	151	[6]
Total derivative liabilities		271	449
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		312	532
Total noncurrent derivative assets		238	237
Total current derivative liabilities		244	700
Total noncurrent derivative liabilities		55	226
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative assets		91	264
Total noncurrent derivative assets		26	4
Total current derivative liabilities		188	290
Total noncurrent derivative liabilities		44	58
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract
Derivatives Fair Value [Line Items]
Total current derivative assets		298	104
Total noncurrent derivative assets		321	689
Total current derivative liabilities		76	70
Total noncurrent derivative liabilities		238	300
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 liabilities		11	8
Total noncurrent derivative liabilities		28	93
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Total current derivative liabilities		11	8
Total noncurrent derivative liabilities		$ 28	$ 93

[1] Includes $54 million and $118 million reported in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets at December 31, 2023 and 2022, respectively.

[2] Virginia Power’s noncurrent derivative assets are presented in other deferred charges and other assets in its Consolidated Balance Sheets.

[3] Includes $1 million reported in noncurrent assets held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022.

[4] Includes $30 million and $6 million reported in current liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets at December 31, 2023 and 2022, respectively.

[5] Virginia Power’s noncurrent derivative liabilities are presented in other deferred credits and other liabilities in its Consolidated Balance Sheets.

[6] Includes $1 million reported in noncurrent liabilities held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022.