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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, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets $ 1,646 $ 2,176
Derivative Liabilities 1,078 1,404
Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 474 882
Derivative Liabilities 470 456
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 7,683 7,782
Total Liabilities 1,078 1,404
Fair Value, Measurements, Recurring | Virginia Electric and Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,708 3,902
Total Liabilities 470 456
Fair Value, Measurements, Recurring | Equity securities: | U.S.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 4,218 3,810
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] 2,238 2,028
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 501 576
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] 285 360
Fair Value, Measurements, Recurring | Fixed Income | Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments [1] 1,275 1,220
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] 688 632
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] 43  
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]    
Cash equivalents and other [1] 23  
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 9  
Derivative Liabilities 162 101
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 9  
Derivative Liabilities 162 101
Fair Value, Measurements, Recurring | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 336 769
Derivative Liabilities 488 926
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 76 268
Derivative Liabilities 308 348
Fair Value, Measurements, Recurring | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 1,301 1,407
Derivative Liabilities 428 377
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 389 614
Derivative Liabilities   7
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 4,427 3,971
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 2,349 2,118
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] 4,218 3,810
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] 2,238 2,028
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] 166 161
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] 88 90
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] 43  
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] 23  
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,096 3,374
Total Liabilities 869 1,389
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 1,343 1,548
Total Liabilities 275 441
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] 501 576
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] 285 360
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] 1,109 1,059
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] 600 542
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 9  
Derivative Liabilities 162 101
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 9  
Derivative Liabilities 162 101
Fair Value, Measurements, Recurring | Level 2 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 176 332
Derivative Liabilities 279 911
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 60 32
Derivative Liabilities 113 333
Fair Value, Measurements, Recurring | Level 2 | Interest Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 1,301 1,407
Derivative Liabilities 428 377
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 389 614
Derivative Liabilities   7
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 160 437
Total Liabilities 209 15
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 16 236
Total Liabilities 195 15
Fair Value, Measurements, Recurring | Level 3 | Commodity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 160 437
Derivative Liabilities 209 15
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 16 236
Derivative Liabilities $ 195 $ 15
[1] Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $370 million and $404 million of assets at Dominion Energy, inclusive of $147 million and $161 million at Virginia Power, at September 30, 2023 and December 31, 2022, 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.