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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets $ 1,399 $ 1,350
Derivative Liabilities 512 697
Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 375 298
Derivative Liabilities 225 316
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 9,259 7,865
Total liabilities 512 697
Fair Value, Measurements, Recurring | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 4,563 3,770
Total liabilities 225 316
Fair Value, Measurements, Recurring | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 5,405 4,527
Fair Value, Measurements, Recurring | Equity securities: | U.S. | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 2,771 2,362
Fair Value, Measurements, Recurring | Equity securities: | International    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 165  
Fair Value, Measurements, Recurring | Equity securities: | International | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 99  
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 518 500
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 294 274
Fair Value, Measurements, Recurring | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 1,743 1,457
Fair Value, Measurements, Recurring | Fixed Income | Government Securities | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 1,024 816
Fair Value, Measurements, Recurring | Cash equivalents and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 29 31 [1]
Fair Value, Measurements, Recurring | Cash equivalents and other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1]   20
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 30  
Derivative Liabilities 192 39
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 30  
Derivative Liabilities 192 39
Fair Value, Measurements, Recurring | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 494 550
Derivative Liabilities 123 299
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 115 117
Derivative Liabilities 33 232
Fair Value, Measurements, Recurring | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 875 800
Derivative Liabilities 197 359
Fair Value, Measurements, Recurring | Interest Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 230 181
Derivative Liabilities   45
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 5,735 4,777
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,953 2,511
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 5,403 4,527
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 2,769 2,362
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | International    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 165  
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | International | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 99  
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 138 219
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 85 129
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 29 31 [1]
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1]   20
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,125 2,863
Total liabilities 497 558
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,540 1,238
Total liabilities 223 179
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 2  
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S. | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 2  
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 518 500
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 294 274
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 1,605 1,238
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 939 687
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 30  
Derivative Liabilities 192 39
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 30  
Derivative Liabilities 192 39
Fair Value, Measurements, Recurring | Level 2 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 95 325
Derivative Liabilities 108 160
Fair Value, Measurements, Recurring | Level 2 | Commodity | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 45 96
Derivative Liabilities 31 95
Fair Value, Measurements, Recurring | Level 2 | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 875 800
Derivative Liabilities 197 359
Fair Value, Measurements, Recurring | Level 2 | Interest Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 230 181
Derivative Liabilities   45
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 399 [2] 225
Total liabilities 15 [2] 139
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 70 [2] 21
Total liabilities 2 [2] 137
Fair Value, Measurements, Recurring | Level 3 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 399 225
Derivative Liabilities 15 139
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 70 21
Derivative Liabilities $ 2 $ 137
[1] Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $212 million and $457 million of assets at Dominion Energy, inclusive of $76 million and $217 million at Virginia Power, at December 31, 2024 and 2023, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
[2] Represents market prices beyond defined terms for Levels 1 and 2.