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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  | $ 27,881 |  |  |  | $ 27,881 |  |  |
Interest and related charges |  | $ (430) |  |  |  | $ (47) |  | (1,016) |  | $ (221) |
Other income (expense) |  | 325 |  |  |  | (287) |  | 609 |  | (241) |
Income tax expense (benefit) |  | (121) |  |  |  | 117 |  | (342) |  | (119) |
Net Income (Loss) From Continuing Operations |  | 586 |  |  |  | (452) |  | 1,588 |  | 240 |
Total other comprehensive income (loss) |  | (1) |  |  |  | 40 |  | 6 |  | 62 |
Ending balance |  | 28,428 |  |  |  |  |  | 28,428 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 17,593 |  | 17,245 | [2] | 16,348 |  | 17,245 | [2] | 15,980 |
Interest and related charges | [3] | (182) |  |  |  | (145) |  | (363) |  | (293) |
Other income (expense) |  | 48 |  |  |  | (44) |  | 84 |  | (40) |
Income before income tax expense |  | 421 |  |  |  | 47 |  | 873 |  | 465 |
Income tax expense (benefit) |  | (89) |  |  |  | 0 |  | (188) |  | (61) |
Total other comprehensive income (loss) |  | 5 |  |  |  | 22 |  | 0 |  | 34 |
Ending balance |  | 17,930 |  | 17,593 |  | 16,418 |  | 17,930 |  | 16,418 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense) | [4],[5] |  |  |  |  |  |  |  |  | 0 |
Total Derivative-Hedging Activities |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (250) | [6],[7] | (249) | [4],[5] | (323) | [6],[7] | (249) | [4],[5] | (358) | [4],[5]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 6 | [6],[7] |  |  | 29 | [6],[7] | (3) | [4],[5] | 54 | [4],[5]
Income tax expense (benefit) |  | (2) | [6],[7] |  |  |  |  | (5) | [4],[5] |  |
Net Income (Loss) From Continuing Operations |  | 8 | [6],[7] |  |  |  |  | 16 | [4],[5] |  |
Total other comprehensive income (loss) |  | 14 | [6],[7] |  |  | 40 | [6],[7] | 13 | [4],[5] | 75 | [4],[5]
Ending balance | [6],[7] | (236) | [5] | (250) |  | (283) | [5] | (236) | [5] | (283) | [5]
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 7 | [8],[9] | 16 | [10],[11] | (25) | [8],[9] | 16 | [10],[11] | (45) | [10],[11]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 6 | [8],[9] |  |  | 25 | [8],[9] | (3) | [10],[11] | 44 | [10],[11]
Total other comprehensive income (loss) |  | 6 | [8],[9] |  |  | 25 | [8],[9] | (3) | [10],[11] | 45 | [10],[11]
Ending balance | [8],[9] | 13 | [11] | 7 |  | 0 | [11] | 13 | [11] | 0 | [11]
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  | 10 | [6],[7] |  |  | 14 | [6],[7] | (21) | [4],[5] | 28 | [4],[5]
Other income (expense) |  | 0 | [6],[7] |  |  | 0 | [6],[7] | 0 | [4],[5] |  |
Income before income tax expense |  | 10 | [6],[7] |  |  | 14 | [6],[7] | 21 | [4],[5] | 28 | [4],[5]
Income tax expense (benefit) |  |  |  |  |  | (3) | [6],[7] |  |  | (7) | [4],[5]
Net Income (Loss) From Continuing Operations |  |  |  |  |  | 11 | [6],[7] |  |  | 21 | [4],[5]
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 | [10],[11] |  |  |  |  |  |  |  |  | 1 |
Other income (expense) | [10],[11] |  |  |  |  |  |  |  |  | 0 |
Income before income tax expense | [10],[11] |  |  |  |  |  |  | 1 |  |  |
Net Income (Loss) From Continuing Operations | [10],[11] |  |  |  |  |  |  |  |  | 1 |
Investment Securities |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (26) | [12] | (44) | [13] | (22) | [12] | (44) | [13] | 37 | [13]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (1) | [12] |  |  | (27) | [12] | 16 | [13] | (89) | [13]
Income tax expense (benefit) |  | 1 | [12] |  |  |  |  | 0 | [13] |  |
Net Income (Loss) From Continuing Operations |  | (2) | [12] |  |  |  |  | (1) | [13] |  |
Total other comprehensive income (loss) |  | (3) | [12] |  |  | (18) | [12] | 15 | [13] | (77) | [13]
Ending balance | [12] | (29) | [13] | (26) |  | (40) | [13] | (29) | [13] | (40) | [13]
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (3) | [14] | (7) | [15] | (4) | [14] | (7) | [15] | 4 | [15]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | (1) | [14] |  |  | (3) | [14] | 3 | [15] | (10) | [15]
Total other comprehensive income (loss) |  | (1) | [14] |  |  | (3) | [14] | 3 | [15] | (11) | [15]
Ending balance | [14] | (4) | [15] | (3) |  | (7) | [15] | (4) | [15] | (7) | [15]
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  | 0 | [12] |  |  | 0 | [12] | 0 | [13] | 0 | [13]
Other income (expense) |  | (3) | [12] |  |  | 12 | [12] | (1) | [13] | 16 | [13]
Income before income tax expense |  | (3) | [12] |  |  | 12 | [12] | (1) | [13] | 16 | [13]
Income tax expense (benefit) |  |  |  |  |  | (3) | [12] |  |  | (4) | [13]
Net Income (Loss) From Continuing Operations |  |  |  |  |  | 9 | [12] |  |  | 12 | [13]
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges | [15] |  |  |  |  |  |  |  |  | 0 |
Other income (expense) | [15] |  |  |  |  |  |  |  |  | (1) |
Income before income tax expense | [15] |  |  |  |  |  |  | (1) |  |  |
Net Income (Loss) From Continuing Operations | [15] |  |  |  |  |  |  |  |  | (1) |
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,287) | [16] | (1,276) | [17] | (1,088) | [16] | (1,276) | [17] | (1,133) | [17]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 0 | [16] |  |  | 2 | [16] | 0 | [17] | 30 | [17]
Income tax expense (benefit) |  | 4 | [16] |  |  |  |  | 8 | [17] |  |
Net Income (Loss) From Continuing Operations |  | (12) | [16] |  |  |  |  | (23) | [17] |  |
Total other comprehensive income (loss) |  | (12) | [16] |  |  | 18 | [16] | (23) | [17] | 63 | [17]
Ending balance | [16] | (1,299) | [17] | (1,287) |  | (1,070) | [17] | (1,299) | [17] | (1,070) | [17]
Pension and Other Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  | 0 | [16] |  |  | 0 | [16] | 0 | [17] | 0 | [17]
Other income (expense) |  | (16) | [16] |  |  | 22 | [16] | (31) | [17] | 45 | [17]
Income before income tax expense |  | (16) | [16] |  |  | 22 | [16] | (31) | [17] | 45 | [17]
Income tax expense (benefit) |  |  |  |  |  | (6) | [16] |  |  | (12) | [17]
Net Income (Loss) From Continuing Operations |  |  |  |  |  | 16 | [16] |  |  | 33 | [17]
Equity Method Investees |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (2) | [18] | (3) | [19] | (3) | [18] | (3) | [19] | (4) | [19]
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 0 | [18] |  |  | 0 | [18] | 1 | [19] | 1 | [19]
Income tax expense (benefit) |  | 0 | [18] |  |  |  |  | 0 | [19] |  |
Net Income (Loss) From Continuing Operations |  | 0 | [18] |  |  |  |  | 0 | [19] | 0 | [19]
Total other comprehensive income (loss) |  | 0 | [18] |  |  | 0 | [18] | 1 | [19] | 1 | [19]
Ending balance | [18] | (2) | [19] | (2) |  | (3) | [19] | (2) | [19] | (3) | [19]
Equity Method Investees | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  | 0 | [18] |  |  | 0 | [18] | 0 | [19] | 0 | [19]
Other income (expense) |  | 0 | [18] |  |  | 0 | [18] | 0 | [19] | 0 | [19]
Income before income tax expense |  | 0 | [18] |  |  | 0 | [18] | 0 | [19] | 0 | [19]
Income tax expense (benefit) | [18] |  |  |  |  | 0 |  |  |  |  |
Net Income (Loss) From Continuing Operations | [18] |  |  |  |  | 0 |  |  |  |  |
AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,565) |  | (1,572) |  | (1,436) |  | (1,572) |  | (1,458) |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 5 |  |  |  | 4 |  | 14 |  | (4) |
Income tax expense (benefit) |  | 3 |  |  |  |  |  | 3 |  |  |
Net Income (Loss) From Continuing Operations |  | (6) |  |  |  |  |  | (8) |  |  |
Total other comprehensive income (loss) |  | (1) |  |  |  | 40 |  | 6 |  | 62 |
Ending balance |  | (1,566) |  | (1,565) |  | (1,396) |  | (1,566) |  | (1,396) |
AOCI | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 4 |  | 9 |  | (29) |  | 9 |  | (41) |
Other comprehensive income (loss) before reclassifications: gains (losses) |  | 5 |  |  |  | 22 |  | 0 |  | 34 |
Total other comprehensive income (loss) |  | 5 |  |  |  | 22 |  | 0 |  | 34 |
Ending balance |  | 9 |  | $ 4 |  | (7) |  | 9 |  | (7) |
AOCI | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  | 10 |  |  |  | 14 |  | (21) |  | 28 |
Other income (expense) |  | (19) |  |  |  | 34 |  | (32) |  | 61 |
Income before income tax expense |  | $ (9) |  |  |  | 48 |  | $ (11) |  | 89 |
Income tax expense (benefit) |  |  |  |  |  | (12) |  |  |  | (23) |
Net Income (Loss) From Continuing Operations |  |  |  |  |  | $ 36 |  |  |  | 66 |
AOCI | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1 |
Other income (expense) |  |  |  |  |  |  |  |  |  | (1) |
Net Income (Loss) From Continuing Operations |  |  |  |  |  |  |  |  |  | $ 0 |
[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 $79 million, $83 million, $94 million and $119 million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.
[6] | Comprised entirely of interest rate derivative hedging activities.
[7] | Net of $79 million, $83 million, $94 million and $107 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[8] | Comprised entirely of interest rate derivative hedging activities.
[9] | Net of $(4) million, $(2) million, $— million and $9 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[10] | Comprised entirely of interest rate derivative hedging activities.
[11] | Net of $(4) million, $(5) million, $— million and $16 million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.
[12] | Net of $9 million, $6 million, $14 million and $8 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[13] | Net of $9 million, $13 million, $14 million and $(10) million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.
[14] | Net of $1 million, $1 million, $3 million and $1 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[15] | Net of $1 million, $2 million, $3 million and $(2) million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.
[16] | Net of $453 million, $449 million, $376 million and $380 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[17] | Net of $453 million, $445 million, $376 million and $396 million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.
[18] | Net of $— million, $— million, $1 million and $1 million tax at June 30, 2023, March 31, 2023, June 30, 2022 and March 31, 2022, respectively.
[19] | Net of $— million, $1 million, $1 million and $1 million tax at June 30, 2023, December 31, 2022, June 30, 2022 and December 31, 2021, respectively.

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