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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, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [1] | $ 27,881 |  |
Interest and related charges (benefit) |  | (586) |  | $ (174)
Other income (expense) |  | 284 |  | 46
Income tax expense (benefit) |  | (221) |  | (236)
Net Income From Continuing Operations |  | 1,002 |  | 692
Total other comprehensive income (loss) |  | 7 |  | 22
Ending balance |  | 28,356 |  |
Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | 17,245 | [2] | 15,980
Interest and related charges (benefit) | [3] | (181) |  | (148)
Other income (expense) |  | 36 |  | 4
Income before income tax expense |  | 452 |  | 418
Income tax expense (benefit) |  | (99) |  | (61)
Total other comprehensive income (loss) |  | (5) |  | 12
Ending balance |  | 17,593 |  | 16,348
Total Derivative-Hedging Activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [4],[5] | (249) |  | (358)
Other comprehensive income (loss) before reclassifications: gains (losses) | [4],[5] | (9) |  | 25
Total other comprehensive income (loss) | [4],[5] | (1) |  | 35
Ending balance | [4],[5] | (250) |  | (323)
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [6],[7] | 16 |  | (45)
Other comprehensive income (loss) before reclassifications: gains (losses) | [6],[7] | (9) |  | 19
Total other comprehensive income (loss) | [6],[7] | (9) |  | 20
Ending balance | [6],[7] | 7 |  | (25)
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges (benefit) | [4],[5] | 11 |  | 14
Income before income tax expense | [4],[5] | 11 |  | 14
Income tax expense (benefit) | [4],[5] | (3) |  | (4)
Net Income From Continuing Operations | [4],[5] | 8 |  | 10
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges (benefit) | [6],[7] |  |  | 1
Income before income tax expense | [6],[7] |  |  | 1
Net Income From Continuing Operations | [6],[7] |  |  | 1
Investment Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [8] | (44) |  | 37
Other comprehensive income (loss) before reclassifications: gains (losses) | [8] | 17 |  | (62)
Total other comprehensive income (loss) | [8] | 18 |  | (59)
Ending balance | [8] | (26) |  | (22)
Investment Securities | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [9] | (7) |  | 4
Other comprehensive income (loss) before reclassifications: gains (losses) | [9] | 4 |  | (7)
Total other comprehensive income (loss) | [9] | 4 |  | (8)
Ending balance | [9] | (3) |  | (4)
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income (expense) | [8] | 2 |  | 4
Income before income tax expense | [8] | 2 |  | 4
Income tax expense (benefit) | [8] | (1) |  | (1)
Net Income From Continuing Operations | [8] | 1 |  | 3
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income (expense) | [9] |  |  | (1)
Income before income tax expense | [9] |  |  | (1)
Net Income From Continuing Operations | [9] |  |  | (1)
Pension and Other Postretirement Benefit Costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [10] | (1,276) |  | (1,133)
Other comprehensive income (loss) before reclassifications: gains (losses) | [10] |  |  | 28
Total other comprehensive income (loss) | [10] | (11) |  | 45
Ending balance | [10] | (1,287) |  | (1,088)
Pension and Other Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income (expense) | [10] | (15) |  | 23
Income before income tax expense | [10] | (15) |  | 23
Income tax expense (benefit) | [10] | 4 |  | (6)
Net Income From Continuing Operations | [10] | (11) |  | 17
Equity Method Investees |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [11] | (3) |  | (4)
Other comprehensive income (loss) before reclassifications: gains (losses) | [11] | 1 |  | 1
Total other comprehensive income (loss) | [11] | 1 |  | 1
Ending balance | [11] | (2) |  | (3)
AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (1,572) |  | (1,458)
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 9 |  | (8)
Total other comprehensive income (loss) |  | 7 |  | 22
Ending balance |  | (1,565) |  | (1,436)
AOCI | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | 9 |  | (41)
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (5) |  | 12
Total other comprehensive income (loss) |  | (5) |  | 12
Ending balance |  | 4 |  | (29)
AOCI | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges (benefit) |  | 11 |  | 14
Other income (expense) |  | (13) |  | 27
Income before income tax expense |  | (2) |  | 41
Income tax expense (benefit) |  |  |  | (11)
Net Income From Continuing Operations |  | $ (2) |  | 30
AOCI | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest and related charges (benefit) |  |  |  | 1
Other income (expense) |  |  |  | $ (1)
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See Note 19 for amounts attributable to affiliates.
[4] | Comprised entirely of interest rate derivative hedging activities.
[5] | Net of $83 million, $83 million, $107 million and $119 million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively.
[6] | Comprised entirely of interest rate derivative hedging activities.
[7] | Net of $(2) million, $(5) million, $9 million and $16 million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively
[8] | Net of $6 million, $13 million, $8 million and $(10) million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively.
[9] | Net of $1 million, $2 million, $1 million and $(2) million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively.
[10] | Net of $449 million, $445 million, $380 million and $396 million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively.
[11] | Net of $— million, $1 million, $1 million and $1 million tax at March 31, 2023, December 31, 2022, March 31, 2022 and December 31, 2021, respectively.

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