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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets $ 1,160 $ 1,350
Total derivative liabilities 181 697
Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 199 298
Total derivative liabilities 112 316
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 8,959 7,865
Total Liabilities 181 697
Fair Value, Measurements, Recurring | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 4,378 3,770
Total Liabilities 112 316
Fair Value, Measurements, Recurring | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 5,473 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] 2,818 2,362
Fair Value, Measurements, Recurring | Fixed Income | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 2 20
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 578 500
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] 351 274
Fair Value, Measurements, Recurring | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 1,605 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] 912 816
Fair Value, Measurements, Recurring | Fixed Income | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 141  
Fair Value, Measurements, Recurring | Fixed Income | Other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 96  
Fair Value, Measurements, Recurring | Cash Equivalents and Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 2 31
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 8  
Total derivative liabilities 52 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]    
Total derivative assets 8  
Total derivative liabilities 52 39
Fair Value, Measurements, Recurring | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 109 550
Total derivative liabilities 450 299
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 60 117
Total derivative liabilities 146 232
Fair Value, Measurements, Recurring | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 20 800
Total derivative liabilities 702 359
Fair Value, Measurements, Recurring | Interest Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 181
Total derivative liabilities 45 45
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 5,614 4,777
Total Liabilities 0 0
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 2,914 2,511
Total Liabilities 0 0
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] 5,473 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] 2,818 2,362
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 1 | 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] 0 0
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] 0 219
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] 0 129
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 141  
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 96  
Fair Value, Measurements, Recurring | Level 1 | Cash Equivalents and Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 0 31
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]    
Cash equivalents and other [1] 0 20
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0  
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Exchange Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0  
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Commodity | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,063 2,863
Total Liabilities 168 558
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 1,371 1,238
Total Liabilities 110 179
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] 0 0
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] 0 0
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] 578 500
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] 351 274
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] 912 687
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0  
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0  
Fair Value, Measurements, Recurring | Level 2 | Cash Equivalents and Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 2 0
Fair Value, Measurements, Recurring | Level 2 | Cash Equivalents and Other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 2 0
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 8  
Total derivative liabilities 52 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]    
Total derivative assets 8  
Total derivative liabilities 52 39
Fair Value, Measurements, Recurring | Level 2 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 96 325
Total derivative liabilities 168 160
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]    
Total derivative assets 58 96
Total derivative liabilities 53 95
Fair Value, Measurements, Recurring | Level 2 | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 20 800
Total derivative liabilities 702 359
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]    
Total derivative assets 0 181
Total derivative liabilities 45 45
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 282 225
Total Liabilities 13 139
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 93 21
Total Liabilities 2 137
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S. | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | 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] 0 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0  
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Other | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 0  
Fair Value, Measurements, Recurring | Level 3 | Cash Equivalents and Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents and other [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0  
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Exchange Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0  
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 13 225
Total derivative liabilities 282 139
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]    
Total derivative assets 2 21
Total derivative liabilities 93 137
Fair Value, Measurements, Recurring | Level 3 | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative assets 0 0
Total derivative liabilities $ 0 $ 0
[1] Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $211 million and $457 million of assets at Dominion Energy, inclusive of $77 million and $217 million at Virginia Power, at September 30, 2024 and December 31, 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.