v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax [1]     $ 29,083  
Total other comprehensive income (loss) $ 58 $ 6 76 $ 13
Ending balance, net of tax 29,554   29,554  
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) 31 (1) 29 (6)
Ending balance, net of tax 29,784   29,784  
Total Derivative-Hedging Activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (154) [3] (230) [3] (183) [4] (229) [4]
Beginning balance, tax 39 [3] 58 [3] 46 [3] 58 [4]
Beginning balance, net of tax (115) [3] (172) [3] (137) [3] (171) [4]
Other comprehensive income (loss) before reclassifications: gains (losses) 56 [3] (3) [3] 65 [4] (19) [4]
Total other comprehensive income (loss) 62 [3] 4 [3] 84 [4] 3 [4]
Ending balance, net of tax [3],[4] (53) (168) (53) (168)
Ending balance, tax [3],[4] 18 57 18 57
Ending balance [3],[4] (71) (225) (71) (225)
Total Derivative-Hedging Activities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 40 [5] 31 [5] 43 [6] 38 [6]
Beginning balance, tax (10) [5] (8) [5] (11) [5] (10) [6]
Beginning balance, net of tax 30 [5] 23 [5] 32 [5] 28 [6]
Other comprehensive income (loss) before reclassifications: gains (losses) 31 [5] (2) [5] 30 [6] (7) [6]
Total other comprehensive income (loss) 31 [5] (2) [5] 29 [6] (7) [6]
Ending balance, net of tax [5] 61 21 61 21
Ending balance, tax [5] (21) (7) (21) (7)
Ending balance [5] 82 28 82 28
Total Derivative-Hedging Activities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 8 [3] 10 [3] 25 [4] 30 [4]
Income (loss) before income tax expense 8 [3] 10 [3] 25 [4] 30 [4]
Income tax expense (benefit) (2) [3] (3) [3] (6) [4] (8) [4]
Total, net of tax 6 [3] 7 [3] 19 [4] 22 [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) [6]     (1)  
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 (1) 3 0 (19)
Beginning balance, tax 0 0 0 9
Beginning balance, net of tax (1) 3 0 (10)
Other comprehensive income (loss) before reclassifications: gains (losses) (3) 6 (4) 15
Total other comprehensive income (loss) (2) 5 (3) 18
Ending balance, net of tax (3) 8 (3) 8
Ending balance, tax 1 (5) 1 (5)
Ending balance (4) 13 (4) 13
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 0 0 0
Other comprehensive income (loss) before reclassifications: gains (losses) (1) 1 (1) 1
Total other comprehensive income (loss) 0 1 0 1
Ending balance, net of tax 0 1 0 1
Ending balance, tax 0 0 0 0
Ending balance 0 1 0 1
Investment Securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) 2 (1) 2 4
Income (loss) before income tax expense 2 (1) 2 4
Income tax expense (benefit) (1) 0 (1) (1)
Total, net of tax 1 (1) 1 3
Investment Securities | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) 1   1  
Income (loss) before income tax expense 1 0 1 0
Income tax expense (benefit) 0 0 0 0
Total, net of tax 1 0 1 0
Pension and Other Postretirement Benefit Costs        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 21 [7] 32 [7] 26 [8] 38 [8]
Beginning balance, tax (5) [7] (8) [7] (7) [7] (9) [8]
Beginning balance, net of tax 16 [7] 24 [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] (3) [7] (5) [8] (8) [8]
Ending balance, net of tax [7] 14 21 14 21
Ending balance, tax [7] (4) (7) (4) (7)
Ending balance [7] 18 28 18 28
Pension and Other Postretirement Benefit Costs | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (expense) (3) [7] (3) [7] (8) [8] (9) [8]
Income (loss) before income tax expense (3) [7] (3) [7] (8) [8] (9) [8]
Income tax expense (benefit) 1 [7] 0 [7] 3 [8] 1 [8]
Total, net of tax (2) [7] (3) [7] (5) [8] (8) [8]
AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (134) (195) (157) (210)
Beginning balance, tax 34 50 39 58
Beginning balance, net of tax (100) (145) (118) (152)
Other comprehensive income (loss) before reclassifications: gains (losses) 53 3 61 (4)
Total other comprehensive income (loss) 58 6 76 13
Ending balance, net of tax (42) (139) (42) (139)
Ending balance, tax 15 45 15 45
Ending balance (57) (184) (57) (184)
AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 40 30 43 37
Beginning balance, tax (10) (7) (11) (9)
Beginning balance, net of tax 30 23 32 28
Other comprehensive income (loss) before reclassifications: gains (losses) 30 (1) 29 (6)
Total other comprehensive income (loss) 31 (1) 29 (6)
Ending balance, net of tax 61 22 61 22
Ending balance, tax (21) (7) (21) (7)
Ending balance 82 29 82 29
AOCI | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit) 8 10 25 30
Other income (expense) (1) (4) (6) (5)
Income (loss) before income tax expense 7 6 19 25
Income tax expense (benefit) (2) (3) (4) (8)
Total, net of tax 5 3 15 17
AOCI | Amounts reclassified from AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges (benefit)     (1)  
Other income (expense) 1 0 1  
Income (loss) before income tax expense 1 0 0 0
Income tax expense (benefit) 0 0 0 0
Total, net of tax $ 1 $ 0 $ 0 $ 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.