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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Fair Value $ 2,211  
Cash equivalents and other, Amortized Cost [1] 65 $ 84
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] 65 84
Amortized Cost, Total 3,828 3,699
Total Unrealized Gains 4,281 3,308
Total Unrealized Losses [2] (58) (61)
Allowance for Credit Losses, Total 0 0
Fair Value, Total 8,051 6,946
Fair value of securities in an unrealized loss position 1,400 764
Net assets related to pending sale of securities 35 49
Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Fair Value 1,318  
Cash equivalents and other, Amortized Cost [1] 22 47
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] 22 47
Amortized Cost, Total 2,092 2,033
Total Unrealized Gains 2,227 1,726
Total Unrealized Losses [2] (33) (43)
Allowance for Credit Losses, Total 0 0
Fair Value, Total 4,286 3,716
Fair value of securities in an unrealized loss position 796 384
Net assets related to pending sale of securities 22 27
Corporate Debt Fixed Income Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3] 516 508
Fixed income securities Total Unrealized Gains [3] 6 10
Fixed income securities Total Unrealized Losses [3] (15) (27)
Fixed income securities Allowance for Credit Losses [3] 0 0
Fixed income securities Fair Value [3] 507 491
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3] 303 292
Fixed income securities Total Unrealized Gains [3] 3 3
Fixed income securities Total Unrealized Losses [3] (12) (21)
Fixed income securities Allowance for Credit Losses [3] 0 0
Fixed income securities Fair Value [3] 294 274
Government Debt Fixed Income Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3] 1,736 1,426
Fixed income securities Total Unrealized Gains [3] 7 28
Fixed income securities Total Unrealized Losses [3] (39) (24)
Fixed income securities Allowance for Credit Losses [3] 0 0
Fixed income securities Fair Value [3] 1,704 1,430
Government Debt Fixed Income Securities | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3] 1,038 811
Fixed income securities Total Unrealized Gains [3] 4 17
Fixed income securities Total Unrealized Losses [3] (18) (12)
Fixed income securities Allowance for Credit Losses [3] 0 0
Fixed income securities Fair Value [3] 1,024 816
Insurance Contracts    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [4] 239 244
Fixed income securities Total Unrealized Gains [4] 0 0
Fixed income securities Total Unrealized Losses [4] 0 0
Fixed income securities Fair Value [4] 239 244
U.S.    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [5] 1,220 1,276
Equity securities Total Unrealized Gains [5] 4,157 3,270
Equity securities Total Unrealized Losses [5] (4) (10)
Equity securities Fair Value [5] 5,373 4,536
U.S. | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [5] 695 759
Equity securities Total Unrealized Gains [5] 2,155 1,706
Equity securities Total Unrealized Losses [5] (3) (10)
Equity securities Fair Value [5] 2,847 2,455
International    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [5] 52  
Equity securities Total Unrealized Gains [5] 111  
Equity securities Fair Value [5] 163  
International | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Equity securities Amortized Cost [5] 34  
Equity securities Total Unrealized Gains [5] 65  
Equity securities Fair Value [5] $ 99  
Common/collective trust funds | Fixed Income    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3]   161
Fixed income securities Total Unrealized Gains [3]   0
Fixed income securities Total Unrealized Losses [3]   0
Fixed income securities Allowance for Credit Losses [3]   0
Fixed income securities Fair Value [3]   161
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company    
Debt Securities, Available-for-Sale [Line Items]    
Fixed income securities Amortized Cost, Total [3]   124
Fixed income securities Total Unrealized Gains [3]   0
Fixed income securities Total Unrealized Losses [3]   0
Fixed income securities Allowance for Credit Losses [3]   0
Fixed income securities Fair Value [3]   $ 124
[1] Dominion Energy includes pending sales of securities of $35 million and $49 million at December 31, 2024 and 2023, respectively. Virginia Power includes pending sales of securities of $22 million and $27 million at December 31, 2024 and 2023, respectively.
[2] Dominion Energy’s fair value of securities in an unrealized loss position was $1.4 billion and $764 million at December 31, 2024 and 2023, respectively. Virginia Power’s fair value of securities in an unrealized loss position was $796 million and $384 million at December 31, 2024 and 2023, respectively.
[3] Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. Changes in allowance for credit losses are included in other income (expense)
[4] Includes company owned life insurance contracts measured at cash surrender value.
[5] Unrealized gains and losses on equity securities are included in other income (expense) and the nuclear decommissioning trust regulatory liability as discussed in Note 2.