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Equity (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance $ 27,567    
Total other comprehensive income (loss) 17 $ 67 $ 16
Ending balance 27,253 27,567  
Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 21,657    
Total other comprehensive income (loss) 11 7 50
Ending balance 22,214 21,657  
Total Derivative-Hedging Activities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [1],[2] (216) (249)  
Other comprehensive income before reclassifications: gains (losses) 13    
Total other comprehensive income (loss) [1],[2] 45 33  
Ending balance [1],[2] (171) (216) (249)
Total Derivative-Hedging Activities | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [3],[4] 15 16  
Other comprehensive income before reclassifications: gains (losses) [3],[4] 13 (1)  
Total other comprehensive income (loss) [3],[4] 13 (1)  
Ending balance [3],[4] 28 15 16
Total Derivative-Hedging Activities | Amounts reclassified from AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Interest and related charges [1],[2] 43 43  
Income (loss) before income tax expense [1],[2] 43 43  
Income tax expense (benefit) [1],[2] (11) (10)  
Total, net of tax [1],[2] 32 33  
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Interest and related charges [3],[4]   1  
Income (loss) before income tax expense [3],[4] 0 1  
Income tax expense (benefit) [3],[4] 0 (1)  
Investment Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [5]   (44)  
Other comprehensive income before reclassifications: gains (losses) [5] (22) 55  
Total other comprehensive income (loss) [5] (14) 44  
Ending balance [5] (14)   (44)
Investment Securities | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [6] 1 (7)  
Other comprehensive income before reclassifications: gains (losses) [6] (5) 7  
Total other comprehensive income (loss) [6] (2) 8  
Ending balance [6] (1) 1 (7)
Investment Securities | Amounts reclassified from AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Other income (expense) [5] 11 (14)  
Income (loss) before income tax expense [5] 11 (14)  
Income tax expense (benefit) [5] (3) 3  
Total, net of tax [5] 8 (11)  
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Other income (expense) [6] 4 1  
Income (loss) before income tax expense [6] 4 1  
Income tax expense (benefit) [6] (1)    
Total, net of tax [6] 3 1  
Pension and Other Postretirement Benefit Costs      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [7],[8] 43 56  
Other comprehensive income before reclassifications: gains (losses) [7],[8] (2) 0  
Total other comprehensive income (loss) [7],[8] (14) (13)  
Ending balance [7],[8] 29 43 56
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Other income (expense) [7],[8] (16) (18)  
Income (loss) before income tax expense [7],[8] (16) (18)  
Income tax expense (benefit) [7],[8] 4 5  
Total, net of tax [7],[8] (12) (13)  
Equity Method Investees      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance [9]   (3)  
Discontinued operations [9]   4  
Total other comprehensive income (loss) [9]   3  
Ending balance [9]     (3)
Equity Method Investees | Amounts reclassified from AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Income (loss) before income tax expense [9]   4  
Income tax expense (benefit) [9]   (1)  
Total, net of tax [9]   3  
AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (173) (240)  
Other comprehensive income before reclassifications: gains (losses) (11) 55  
Discontinued operations   4  
Total other comprehensive income (loss) 17 67 16
Ending balance (156) (173) (240)
AOCI | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 16 9  
Other comprehensive income before reclassifications: gains (losses) 8 6  
Total other comprehensive income (loss) 11 7 50
Ending balance 27 16 $ 9
AOCI | Amounts reclassified from AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Interest and related charges   43  
Other income (expense) (5) (32)  
Income (loss) before income tax expense 38 15  
Income tax expense (benefit) (10) (3)  
Total, net of tax 28 12  
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company      
Accumulated Other Comprehensive Income Loss [Line Items]      
Interest and related charges   1  
Other income (expense) 4 1  
Income (loss) before income tax expense 4 2  
Income tax expense (benefit) (1) (1)  
Total, net of tax $ 3 $ 1  
[1] Comprised entirely of interest rate derivative hedging activities.
[2] Net of $58 million, $73 million and $83 million tax at December 31, 2024, 2023 and 2022, respectively.
[3] Comprised entirely of interest rate derivative hedging activities.
[4] Net of $(10) million, $(5) million and $(5) million tax at December 31, 2024, 2023 and 2022, respectively.
[5] Net of $5 million, $(2) million and $13 million tax at December 31, 2024, 2023 and 2022, respectively.
[6] Net of $— million, $— million and $2 million tax at December 31, 2024, 2023 and 2022, respectively.
[7] Comprised entirely of prior service cost. See Note 22 for additional information.
[8] Net of $(9) million, $(14) million and $(19) million tax at December 31, 2024, 2023 and 2022, respectively.
[9] Net of $— million and $1 million tax at December 31, 2023 and 2022, respectively.