v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax [1]     $ 29,083  
Total other comprehensive income (loss) $ 16 $ 5 18 $ 7
Ending balance, net of tax 28,922   28,922  
Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax [2]     27,205  
Total other comprehensive income (loss) 1 0 (2) (5)
Ending balance, net of tax 28,873   28,873  
Total Derivative-Hedging Activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (179) [3] (240) [3] (183) [4] (229) [4]
Beginning balance, tax 45 [3] 61 [3] 46 [3] 58 [4]
Beginning balance, net of tax (134) [3] (179) [3] (137) [3] (171) [4]
Other comprehensive income (loss) before reclassifications: gains (losses) 12 [3] 0 [3] 9 [4] (16) [4]
Total other comprehensive income (loss) 19 [3] 7 [3] 22 [4] (1) [4]
Ending balance, net of tax [3],[4] (115) (172) (115) (172)
Ending balance, tax [3],[4] 39 58 39 58
Ending balance [3],[4] (154) (230) (154) (230)
Total Derivative-Hedging Activities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 39 [5] 28 [5] 43 [6] 38 [6]
Beginning balance, tax (10) [5] (7) [5] (11) [5] (10) [6]
Beginning balance, net of tax 29 [5] 21 [5] 32 [5] 28 [6]
Other comprehensive income (loss) before reclassifications: gains (losses) 1 [5] 2 [5] (1) [6] (5) [6]
Total other comprehensive income (loss) 1 [5] 2 [5] (2) [6] (5) [6]
Ending balance, net of tax [5] 30 23 30 23
Ending balance, tax [5] (10) (8) (10) (8)
Ending balance [5] 40 31 40 31
Total Derivative-Hedging Activities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 9 [3] 10 [3] 17 [4] 20 [4]
Income (loss) before income tax expense 9 [3] 10 [3] 17 [4] 20 [4]
Income tax expense (benefit) (2) [3] (3) [3] (4) [4] (5) [4]
Total, net of tax 7 [3] 7 [3] 13 [4] 15 [4]
Total Derivative-Hedging Activities | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) (0) [5]   (1) [6]  
Other income (expense) [6]     0  
Income (loss) before income tax expense (0) [5] 0 [5] (1) [6] 0 [6]
Income tax expense (benefit) 0 [5] 0 [5] 0 [6] 0 [6]
Total, net of tax (0) [5] 0 [5] (1) [6] 0 [6]
Investment Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 1 (0) (19)
Beginning balance, tax 0 2 0 9
Beginning balance, net of tax 0 3 0 (10)
Other comprehensive income (loss) before reclassifications: gains (losses) (1) (2) (1) 9
Total other comprehensive income (loss) (1) 0 (1) 13
Ending balance, net of tax (1) 3 (1) 3
Ending balance, tax 0 0 0 0
Ending balance (1) 3 (1) 3
Investment Securities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 1 0 (1)
Beginning balance, tax 0 1 0 1
Beginning balance, net of tax 0 2 0 0
Other comprehensive income (loss) before reclassifications: gains (losses) 0 (2) 0 0
Total other comprehensive income (loss) 0 (2) 0 0
Ending balance, net of tax 0 0 0 0
Ending balance, tax 0 1 0 1
Ending balance 0 (1) 0 (1)
Investment Securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) 0 3 0 5
Income (loss) before income tax expense 0 3 0 5
Income tax expense (benefit) 0 (1) (0) (1)
Total, net of tax 0 2 0 4
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit)     0  
Other income (expense)   0 0  
Income (loss) before income tax expense 0 0 0 0
Income tax expense (benefit) 0 0 0 0
Total, net of tax 0 0 0 0
Pension and Other Postretirement Benefit Costs        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 24 [7] 35 [7] 26 [8] 38 [8]
Beginning balance, tax (6) [7] (9) [7] (7) [7] (9) [8]
Beginning balance, net of tax 18 [7] 26 [7] 19 [7] 29 [8]
Other comprehensive income (loss) before reclassifications: gains (losses) 0 [7] 0 [7] 0 [8] 0 [8]
Total other comprehensive income (loss) (2) [7] (2) [7] (3) [8] (5) [8]
Ending balance, net of tax [7] 16 24 16 24
Ending balance, tax [7] (5) (8) (5) (8)
Ending balance [7] 21 32 21 32
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) (3) [7] (3) [7] (5) [8] (6) [8]
Income (loss) before income tax expense (3) [7] (3) [7] (5) [8] (6) [8]
Income tax expense (benefit) 1 [7] 1 [7] 2 [8] 1 [8]
Total, net of tax (2) [7] (2) [7] (3) [8] (5) [8]
AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (155) (204) (157) (210)
Beginning balance, tax 39 54 39 58
Beginning balance, net of tax (116) (150) (118) (152)
Other comprehensive income (loss) before reclassifications: gains (losses) 11 (2) 8 (7)
Total other comprehensive income (loss) 16 5 18 7
Ending balance, net of tax (100) (145) (100) (145)
Ending balance, tax 34 50 34 50
Ending balance (134) (195) (134) (195)
AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 39 29 43 37
Beginning balance, tax (10) (6) (11) (9)
Beginning balance, net of tax 29 23 32 28
Other comprehensive income (loss) before reclassifications: gains (losses) 1 0 (1) (5)
Total other comprehensive income (loss) 1 0 (2) (5)
Ending balance, net of tax 30 23 30 23
Ending balance, tax (10) (7) (10) (7)
Ending balance 40 30 40 30
AOCI | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 9 10 17 20
Other income (expense) (3)   (5) (1)
Income (loss) before income tax expense 6 10 12 19
Income tax expense (benefit) (1) (3) (2) (5)
Total, net of tax 5 7 10 14
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 0   (1)  
Other income (expense)   0 0  
Income (loss) before income tax expense 0 0 (1) 0
Income tax expense (benefit) 0 0 0 0
Total, net of tax $ 0 $ 0 $ (1) $ 0
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Comprised entirely of interest rate derivative hedging activities.
[4] Comprised entirely of interest rate derivative hedging activities.
[5] Comprised entirely of interest rate derivative hedging activities.
[6] Comprised entirely of interest rate derivative hedging activities.
[7] Comprised entirely of prior service cost.
[8] Comprised entirely of prior service cost.