Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Lessee Lease Disclosure [Line Items]
Operating lease assets	[1]	$ 415	$ 506
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Deferred Charges Regulatory Assets And Other Assets Noncurrent	Deferred Charges Regulatory Assets And Other Assets Noncurrent
Finance lease assets	[2]	$ 144	$ 144
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Property, plant and equipment	Property, plant and equipment
Total lease assets		$ 559	$ 650
Operating lease liabilities	[3]	$ 39	$ 44
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other	Other
Finance lease liabilities	[4]	$ 46	$ 36
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Securities due within one year	Securities due within one year
Total lease liabilities - current		$ 85	$ 80
Operating lease liabilities	[5]	$ 514	$ 464
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Deferred Credits and Other Liabilities	Deferred Credits and Other Liabilities
Finance lease liabilities	[6]	$ 104	$ 112
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other	Other
Total lease liabilities - noncurrent		$ 618	$ 576
Total lease liabilities		703	656
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Operating lease assets	[1]	$ 294	$ 256
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Deferred Charges Regulatory Assets And Other Assets Noncurrent	Deferred Charges Regulatory Assets And Other Assets Noncurrent
Finance lease assets	[2]	$ 82	$ 71
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Property, plant and equipment	Property, plant and equipment
Total lease assets		$ 376	$ 327
Operating lease liabilities	[3]	$ 21	$ 25
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other	Other
Finance lease liabilities	[4]	$ 17	$ 13
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Securities due within one year	Securities due within one year
Total lease liabilities - current		$ 38	$ 38
Operating lease liabilities	[5]	$ 273	$ 227
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Deferred Credits and Other Liabilities	Deferred Credits and Other Liabilities
Finance lease liabilities	[6]	$ 65	$ 57
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other	Other
Total lease liabilities - noncurrent		$ 338	$ 284
Total lease liabilities		$ 376	$ 322

[1] Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.

[2] Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $114 million and $33 million of accumulated amortization at Dominion Energy and Virginia Power, respectively, at December 31, 2022 and net of $81 million and $18 million of accumulated amortization at Dominion Energy and Virginia Power, respectively, at December 31, 2021.

[3] Included in other current liabilities in the Companies’ Consolidated Balance Sheets.

[4] Included in securities due within one year in the Companies’ Consolidated Balance Sheets.

[5] Included in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.

[6] Included in other long-term debt in the Companies’ Consolidated Balance Sheets.