Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Lessee Lease Disclosure [Line Items]
Other deferred charges and other assets		$ 561	$ 451
Finance lease assets	[1]	$ 258	$ 144
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Property, Plant and Equipment, Gross	Property, Plant and Equipment, Gross
Finance lease assets, accumulated amortization		$ 142	$ 106
Operating lease liabilities	[2]	$ 36	$ 39
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other	Other
Finance lease liabilities	[3]	$ 60	$ 46
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Other deferred credits and other liabilities		$ 610	$ 494
Operating lease liabilities	[4]	627	514
Finance lease liabilities	[5]	$ 203	$ 104
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent, Other Long-Term Debt, Noncurrent	Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent, Other Long-Term Debt, Noncurrent
Securities Due within One Year
Lessee Lease Disclosure [Line Items]
Finance lease liabilities		$ 57	$ 42
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Other Long-Term Debt
Lessee Lease Disclosure [Line Items]
Finance lease liabilities		$ 192	$ 91
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Long-Term Debt, Noncurrent	Other Long-Term Debt, Noncurrent
Other Current Liabilities
Lessee Lease Disclosure [Line Items]
Operating lease liabilities		$ 32	$ 34
Property, Plant and Equipment
Lessee Lease Disclosure [Line Items]
Finance lease assets, accumulated amortization		244	127
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Finance lease assets	[1]	$ 104	$ 82
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Property, Plant and Equipment, Gross	Property, Plant and Equipment, Gross
Finance lease assets, accumulated amortization		$ 51	$ 33
Operating lease liabilities	[2]	$ 20	$ 21
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other	Other
Finance lease liabilities	[3]	$ 31	$ 17
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Operating lease liabilities	[4]	$ 377	$ 273
Finance lease liabilities	[5]	$ 72	$ 65
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Long-Term Debt, Noncurrent	Other Long-Term Debt, Noncurrent

[1] Dominion Energy includes $244 million and $127 million at December 31, 2023 and 2022, respectively, in property, plant and equipment in its Consolidated Balance Sheets, net of $142 million and $106 million at December 31, 2023 and 2022, respectively, of accumulated amortization, with the remaining balance in noncurrent assets held for sale. Virginia Power’s balances are included in property, plant and equipment in its Consolidated Balance Sheets, net of $51 million and $33 million at December 31, 2023 and 2022, respectively, of accumulated amortization.

[2] Dominion Energy includes $32 million and $34 million at December 31, 2023 and 2022, respectively, in other current liabilities, with the remaining balance in current liabilities held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are in other current liabilities in its Consolidated Balance Sheets.

[3] Dominion Energy includes $57 million and $42 million at December 31, 2023 and 2022, respectively, in securities due within one year, with the remaining balance in current liabilities held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are included in securities due within one year in its Consolidated Balance Sheets.

[4] Dominion Energy includes $610 million and $494 million at December 31, 2023 and 2022, respectively, in other deferred credits and other liabilities, with the remaining balance in noncurrent liabilities held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are included in other deferred credits and other liabilities in its Consolidated Balance Sheets.

[5] Dominion Energy includes $192 million and $91 million at December 31, 2023 and 2022, respectively, in other long-term debt, with the remaining balance in noncurrent liabilities held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are included in other long-term debt in its Consolidated Balance Sheets.