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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [1] $ 27,529  
Income tax expense (benefit) (134) $ (176)
Net Income From Continuing Operations 560 700
Total other comprehensive income (loss) (238) 7
Ending balance 27,421  
Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 21,657 [2] 16,949
Income before income tax expense 593 452
Income tax expense (benefit) (128) (97)
Total other comprehensive income (loss) 3 (5)
Ending balance 21,876 17,299
Total Derivative-Hedging Activities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [3],[4] (216) (249)
Other comprehensive income (loss) before reclassifications: gains (losses) [3],[4] 7 (9)
Income tax expense (benefit) [3],[4] (4) (3)
Total, net of tax [3],[4] 7 8
Total other comprehensive income (loss) [3],[4] 14 (1)
Ending balance [3],[4] (202) (250)
Total Derivative-Hedging Activities | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [5],[6] 15 16
Other comprehensive income (loss) before reclassifications: gains (losses) [5],[6] 7 (9)
Income tax expense (benefit) [5],[6] 0  
Total, net of tax [5],[6] 0  
Total other comprehensive income (loss) [5],[6] 7 (9)
Ending balance [5],[6] 22 7
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges (benefit) [3],[4] 11 11
Other income (expense) [3],[4] 0 0
Income (loss) before income tax expense [3],[4] 11 11
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income (expense) [5],[6] 0  
Income (loss) before income tax expense [5],[6] 0  
Investment Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [7] 0 (44)
Other comprehensive income (loss) before reclassifications: gains (losses) [7] (26) 17
Income tax expense (benefit) [7] (2) (1)
Total, net of tax [7] 6 1
Total other comprehensive income (loss) [7] (20) 18
Ending balance [7] (20) (26)
Investment Securities | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [8] 1 (7)
Other comprehensive income (loss) before reclassifications: gains (losses) [8] (5) 4
Income tax expense (benefit) [8] 1  
Total, net of tax [8] 1  
Total other comprehensive income (loss) [8] (4) 4
Ending balance [8] (3) (3)
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges (benefit) [7] 0 0
Other income (expense) [7] 8 2
Income (loss) before income tax expense [7] 8 2
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income (expense) [8] 2  
Income (loss) before income tax expense [8] 2  
Pension and Other Postretirement Benefit Costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [9] (1,290) (1,276)
Other comprehensive income (loss) before reclassifications: gains (losses) [9] (237) 0
Income tax expense (benefit) [9] (1) 4
Total, net of tax [9] 5 (11)
Total other comprehensive income (loss) [9] (232) (11)
Ending balance [9] (1,522) (1,287)
Pension and Other Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges (benefit) [9] 0 0
Other income (expense) [9] 6 (15)
Income (loss) before income tax expense [9] 6 (15)
Equity Method Investees    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [10] 0 (3)
Other comprehensive income (loss) before reclassifications: gains (losses) [10] 0 1
Income tax expense (benefit) [10] 0 0
Total, net of tax [10] 0 0
Total other comprehensive income (loss) [10] 0 1
Ending balance [10] 0 (2)
Equity Method Investees | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges (benefit) [10] 0 0
Other income (expense) [10] 0 0
Income (loss) before income tax expense [10] 0 0
AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,506) (1,572)
Other comprehensive income (loss) before reclassifications: gains (losses) (256) 9
Income tax expense (benefit) (7) (0)
Total, net of tax 18 (2)
Total other comprehensive income (loss) (238) 7
Ending balance (1,744) (1,565)
AOCI | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 16 9
Other comprehensive income (loss) before reclassifications: gains (losses) 2 (5)
Income tax expense (benefit) 1  
Total, net of tax 1  
Total other comprehensive income (loss) 3 (5)
Ending balance 19 4
AOCI | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges (benefit) 11 11
Other income (expense) 14 (13)
Income (loss) before income tax expense 25 $ (2)
AOCI | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income (expense) 2  
Income (loss) before income tax expense $ 2  
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Comprised entirely of interest rate derivative hedging activities.
[4] Net of $68 million, $73 million, $83 million and $83 million tax at March 31, 2024, December 31, 2023, March 31, 2023 and December 31, 2022, respectively.
[5] Comprised entirely of interest rate derivative hedging activities.
[6] Net of $(7) million, $(5) million, $(2) million and $(5) million tax at March 31, 2024, December 31, 2023, March 31, 2023 and December 31, 2022, respectively.
[7] Net of $6 million, $(2) million, $6 million and $13 million tax at March 31, 2024, December 31, 2023, March 31, 2023 and December 31, 2022, respectively.
[8] Net of $1 million, $— million, $1 million and $2 million tax at March 31, 2024, December 31, 2023, March 31, 2023 and December 31, 2022, respectively.
[9] Net of $538 million, $456 million, $449 million and $445 million tax at March 31, 2024, December 31, 2023, March 31, 2023 and December 31, 2022, respectively.
[10] Net of $— million at March 31, 2024, December 31, 2023 and March 31, 2023 and $1 million at December 31, 2022.