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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Lessee Lease Disclosure [Line Items]    
Other deferred charges and other assets $ 588 $ 561
Finance lease assets [1] $ 267 $ 258
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 $ 199 $ 142
Operating lease liabilities [2] $ 36 $ 36
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Finance lease liabilities [3] $ 62 $ 60
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 $ 644 $ 610
Operating lease liabilities [4] 644 627
Finance lease liabilities [5] $ 214 $ 203
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Long-Term Debt, Noncurrent Disposal Group, Including Discontinued Operation, Liabilities, Current, Other Long-Term Debt, Noncurrent
Securities Due within One Year    
Lessee Lease Disclosure [Line Items]    
Finance lease liabilities $ 62 $ 57
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 $ 214 $ 192
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 $ 36 $ 32
Property, Plant and Equipment    
Lessee Lease Disclosure [Line Items]    
Finance lease assets, accumulated amortization 267 244
Virginia Electric and Power Company    
Lessee Lease Disclosure [Line Items]    
Finance lease assets [1] $ 146 $ 104
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 $ 88 $ 51
Operating lease liabilities [2] $ 22 $ 20
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Finance lease liabilities [3] $ 35 $ 31
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] $ 399 $ 377
Finance lease liabilities [5] $ 110 $ 72
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Long-Term Debt, Noncurrent Other Long-Term Debt, Noncurrent
[1] Dominion Energy includes $267 million and $244 million at December 31, 2024 and 2023, respectively, in property, plant and equipment in its Consolidated Balance Sheets, net of $199 million and $142 million at December 31, 2024 and 2023, respectively, of accumulated amortization, with the remaining balance at December 31, 2023 in assets held for sale. Virginia Power’s balances are included in property, plant and equipment in its Consolidated Balance Sheets, net of $88 million and $51 million at December 31, 2024 and 2023, respectively, of accumulated amortization.
[2] Dominion Energy includes $36 million and $32 million at December 31, 2024 and 2023, respectively, in other current liabilities, with the remaining balance at December 31, 2023 in 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 $62 million and $57 million at December 31, 2024 and 2023, respectively, in securities due within one year, with the remaining balance at December 31, 2023 in 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 $644 million and $610 million at December 31, 2024 and 2023, respectively, in other deferred credits and other liabilities, with the remaining balance at December 31, 2023 in 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 $214 million and $192 million at December 31, 2024 and 2023, respectively, in other long-term debt, with the remaining balance in 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.