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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance [1]     $ 26,863  
Total other comprehensive income (loss) $ 6 $ 24 13 $ 32
Ending balance 27,691   27,691  
Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance [2]     22,157  
Total other comprehensive income (loss) (1) (3) (6) 4
Ending balance 27,333   27,333  
Total Derivative-Hedging Activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (172) [3],[4] (191) [3],[4] (171) [5],[6] (216) [5],[6]
Other comprehensive income (loss) before reclassifications: gains (losses) (3) [3],[4] (7) [3],[4] (19) [5],[6] 2 [5],[6]
Income tax expense (benefit) (3) [3],[4] (3) [3],[4] (8) [5],[6] (9) [5],[6]
Total, net of tax 7 [3],[4] 8 [3],[4] 22 [5],[6] 24 [5],[6]
Total other comprehensive income (loss) 4 [3],[4] 1 [3],[4] 3 [5],[6] 26 [5],[6]
Ending balance [3],[4],[6] (168) (190) (168) (190)
Total Derivative-Hedging Activities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 23 [7],[8] 24 [7],[8] 28 [9],[10] 15 [9],[10]
Other comprehensive income (loss) before reclassifications: gains (losses) (2) [7],[8] (7) [7],[8] (7) [9],[10] 2 [9],[10]
Income tax expense (benefit) 0 [7],[8] 0 [7],[8] 0 [9],[10] 0 [9],[10]
Total, net of tax 0 [7],[8] 0 [7],[8] 0 [9],[10] 0 [9],[10]
Total other comprehensive income (loss) (2) [7],[8] (7) [7],[8] (7) [9],[10] 2 [9],[10]
Ending balance [7],[8],[10] 21 17 21 17
Total Derivative-Hedging Activities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 10 [3],[4] 11 [3],[4] 30 [5],[6] 33 [5],[6]
Other income (expense) 0 [3],[4] 0 [3],[4] 0 [5],[6] 0 [5],[6]
Income (loss) before income tax expense 10 [3],[4] 11 [3],[4] 30 [5],[6] 33 [5],[6]
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) [9],[10]       0
Income (loss) before income tax expense 0 [7],[8] 0 [7],[8] 0 [9],[10] 0 [9],[10]
Investment Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 3 [11] (10) [11] (10) [12] 1 [12]
Other comprehensive income (loss) before reclassifications: gains (losses) 6 [11] 27 [11] 15 [12] 10 [12]
Income tax expense (benefit) (0) [11] 1 [11] (1) [12] (1) [12]
Total, net of tax (1) [11] (1) [11] 3 [12] 5 [12]
Total other comprehensive income (loss) 5 [11] 26 [11] 18 [12] 15 [12]
Ending balance [11],[12] 8 16 8 16
Investment Securities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 [13] (0) [13] 0 [14] 2 [14]
Other comprehensive income (loss) before reclassifications: gains (losses) 1 [13] 5 [13] 1 [14] 1 [14]
Income tax expense (benefit) 0 [13] (1) [13] 0 [14] (1) [14]
Total, net of tax 0 [13] (1) [13] 0 [14] (1) [14]
Total other comprehensive income (loss) 1 [13] 4 [13] 1 [14] 2 [14]
Ending balance [13],[14] 1 4 1 4
Investment Securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 0 [11] 0 [11] 0 [12] 0 [12]
Other income (expense) (1) [11] (2) [11] 4 [12] 6 [12]
Income (loss) before income tax expense (1) [11] (2) [11] 4 [12] 6 [12]
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) [14]       2
Income (loss) before income tax expense 0 [13] 0 [13] 0 [14] 2 [14]
Pension and Other Postretirement Benefit Costs        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 24 [15],[16] 37 [15],[16] 29 [17],[18] 43 [17],[18]
Other comprehensive income (loss) before reclassifications: gains (losses) 0 [15],[16] 0 [15],[16] 0 [17],[18] 0 [17],[18]
Income tax expense (benefit) 0 [15],[16] 1 [15],[16] 1 [17],[18] 4 [17],[18]
Total, net of tax (3) [15],[16] (3) [15],[16] (8) [17],[18] (9) [17],[18]
Total other comprehensive income (loss) (3) [15],[16] (3) [15],[16] (8) [17],[18] (9) [17],[18]
Ending balance [15],[16],[18] 21 34 21 34
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 0 [15],[16] 0 [15],[16] 0 [17],[18] 0 [17],[18]
Other income (expense) (3) [15],[16] (4) [15],[16] (9) [17],[18] (13) [17],[18]
Income (loss) before income tax expense (3) [15],[16] (4) [15],[16] (9) [17],[18] (13) [17],[18]
AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (145) (164) (152) (172)
Other comprehensive income (loss) before reclassifications: gains (losses) 3 20 (4) 12
Income tax expense (benefit) (3) (1) (8) (6)
Total, net of tax 3 4 17 20
Total other comprehensive income (loss) 6 24 13 32
Ending balance (139) (140) (139) (140)
AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 23 24 28 17
Other comprehensive income (loss) before reclassifications: gains (losses) (1) (2) (6) 3
Income tax expense (benefit) 0 (1) 0 (1)
Total, net of tax 0 (1) 0 1
Total other comprehensive income (loss) (1) (3) (6) 4
Ending balance 22 21 22 21
AOCI | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 10 11 30 33
Other income (expense) (4) (6) (5) (7)
Income (loss) before income tax expense 6 5 25 26
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense)       2
Income (loss) before income tax expense $ 0 $ 0 $ 0 $ 2
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Comprised entirely of interest rate derivative hedging activities.
[4] Net of $57 million, $58 million, $64 million and $64 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[5] Comprised entirely of interest rate derivative hedging activities.
[6] Net of $57 million, $58 million, $64 million and $73 million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[7] Comprised entirely of interest rate derivative hedging activities.
[8] Net of $(7) million, $(8) million, $(6) million and $(8) million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[9] Comprised entirely of interest rate derivative hedging activities.
[10] Net of $(7) million, $(10) million, $(6) million and $(5) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[11] Net of $(5) million, $— million, $(8) million and $6 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[12] Net of $(5) million, $9 million, $(8) million and $(1) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[13] Net of $— million, $1 million, $(2) million and $1 million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[14] Net of $— million, $1 million, $(2) million and $1 million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.
[15] Comprised entirely of prior service cost.
[16] Net of $(7) million, $(8) million, $(10) million and $(11) million tax at September 30, 2025, June 30, 2025, September 30, 2024 and June 30, 2024, respectively.
[17] Comprised entirely of prior service cost.
[18] Net of $(7) million, $(9) million, $(10) million and $(14) million tax at September 30, 2025, December 31, 2024, September 30, 2024 and December 31, 2023, respectively.