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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Fair Value $ 2,308  
Cash equivalents and other, Amortized Cost [1] 50 $ 65
Cash equivalents and other, Total Unrealized Gains [1] 0 0
Cash equivalents and other, Total Unrealized Losses [1] 0 0
Cash equivalents and other, Allowance for Credit Losses [1] 0 0
Cash equivalents and other, Fair Value [1] 50 65
Amortized Cost, Total 3,903 3,828
Total Unrealized Gains 5,073 4,281
Total Unrealized Losses [2] (31) (58)
Allowance for Credit Losses, Total 0 0
Fair Value, Total 8,945 8,051 [3]
Net assets related to pending sales of securities 17 35
Fair value of securities in an unrealized loss position 609 1,400
Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Fair Value 1,372  
Cash equivalents and other, Amortized Cost [1] 9 22
Cash equivalents and other, Total Unrealized Gains [1] 0 0
Cash equivalents and other, Total Unrealized Losses [1] 0 0
Cash equivalents and other, Allowance for Credit Losses [1] 0 0
Cash equivalents and other, Fair Value [1] 9 22
Amortized Cost, Total 2,129 2,092
Total Unrealized Gains 2,638 2,227
Total Unrealized Losses [2] (22) (33)
Allowance for Credit Losses, Total 0 0
Fair Value, Total 4,745 4,286 [4]
Net assets related to pending sales of securities 9 22
Fair value of securities in an unrealized loss position 460 796
Corporate Debt Fixed Income Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [5] 496 516
Fixed income securities Total Unrealized Gains [5] 13 6
Fixed income securities Total Unrealized Losses [5] (7) (15)
Fixed income securities Allowance for Credit Losses [5] 0 0
Fixed income securities Fair Value [5] 502 507
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [5] 288 303
Fixed income securities Total Unrealized Gains [5] 6 3
Fixed income securities Total Unrealized Losses [5] (6) (12)
Fixed income securities Allowance for Credit Losses [5] 0 0
Fixed income securities Fair Value [5] 288 294
Government Debt Fixed Income Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [5] 1,802 1,736
Fixed income securities Total Unrealized Gains [5] 25 7
Fixed income securities Total Unrealized Losses [5] (21) (39)
Fixed income securities Allowance for Credit Losses [5] 0 0
Fixed income securities Fair Value [5] 1,806 1,704
Government Debt Fixed Income Securities | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [5] 1,084 1,038
Fixed income securities Total Unrealized Gains [5] 14 4
Fixed income securities Total Unrealized Losses [5] (14) (18)
Fixed income securities Allowance for Credit Losses [5] 0 0
Fixed income securities Fair Value [5] 1,084 1,024
Insurance Contracts    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [6] 247 239
Fixed income securities Total Unrealized Gains [6] 0 0
Fixed income securities Total Unrealized Losses [6] 0 0
Fixed income securities Fair Value [6] 247 239
U.S.    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [7] 1,257 1,220
Equity securities Total Unrealized Gains [7] 4,907 4,157
Equity securities Total Unrealized Losses [7] (3) (4)
Equity securities Fair Value [7] 6,161 5,373
U.S. | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [7] 716 695
Equity securities Total Unrealized Gains [7] 2,546 2,155
Equity securities Total Unrealized Losses [7] (2) (3)
Equity securities Fair Value [7] 3,260 2,847
International    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [7] 51 52
Equity securities Total Unrealized Gains [7] 128 111
Equity securities Total Unrealized Losses [7] 0 0
Equity securities Fair Value [7] 179 163
International | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [7] 32 34
Equity securities Total Unrealized Gains [7] 72 65
Equity securities Total Unrealized Losses [7] 0 0
Equity securities Fair Value [7] $ 104 $ 99
[1] Dominion Energy includes pending sales of securities of $17 million and $35 million at September 30, 2025 and December 31, 2024, respectively. Virginia Power includes pending sales of securities of $9 million and $22 million at September 30, 2025, and December 31, 2024, respectively.
[2] Dominion Energy’s fair value of securities in an unrealized loss position was $609 million and $1.4 billion at September 30, 2025 and December 31, 2024, respectively. Virginia Power’s fair value of securities in an unrealized loss position was $460 million and $796 million at September 30, 2025 and December 31, 2024, respectively.
[3] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[4] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[5] Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Changes in allowance for credit losses are included in other income (expense).
[6] Includes company owned life insurance contracts measured at cash surrender value.
[7] Unrealized gains and losses on equity securities are included in other income (expense) and the nuclear decommissioning trust regulatory liability.