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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [1] |  |  | $ 27,308 |  |
Interest and related charges |  | $ (47) | $ (518) | (221) |  | $ (571)
Other income (expense) |  | (287) | 312 | (241) |  | 599
Income tax expense (benefit) |  | 117 | 47 | (119) |  | (165)
Net Income (Loss) From Continuing Operations |  | (452) | 269 | 240 |  | 1,249
Total other comprehensive income |  | 40 | 31 | 62 |  | 77
Ending balance |  | 28,297 |  | 28,297 |  |
Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 16,348 | 14,811 | 15,980 | [2] | 14,557
Interest and related charges | [3] | (145) | (128) | (293) |  | (264)
Other income (expense) |  | (44) | 40 | (40) |  | 72
Income before income tax expense |  | 47 | 483 | 465 |  | 927
Income tax expense (benefit) |  |  | (69) | (61) |  | (139)
Total other comprehensive income |  | 22 | (10) | 34 |  | 19
Ending balance |  | 16,418 | 15,064 | 16,418 |  | 15,064
Commodity |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  |  |  | (1)
Total other comprehensive income |  |  |  |  |  | 1
Commodity | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Purchased Gas |  |  |  |  |  | 1
Income before income tax expense |  |  |  |  |  | 1
Net Income (Loss) From Continuing Operations |  |  |  |  |  | 1
Interest Rate |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (323) | (367) | (358) |  | (418)
Other comprehensive income before reclassifications: gains (losses) |  | 29 | (16) | 54 |  | 23
Total other comprehensive income |  | 40 | (4) | 75 |  | 47
Ending balance |  | (283) | (371) | (283) |  | (371)
Interest Rate | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Interest and related charges |  | 14 | 16 | 28 |  | 32
Income before income tax expense |  | 14 | 16 | 28 |  | 32
Income tax expense (benefit) |  | (3) | (4) | (7) |  | (8)
Net Income (Loss) From Continuing Operations |  | 11 | 12 | 21 |  | 24
Total Derivative-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [4] | (323) | (367) | (358) |  | (419)
Other comprehensive income before reclassifications: gains (losses) | [4] | 29 | (16) | 54 |  | 23
Total other comprehensive income | [4] | 40 | (4) | 75 |  | 48
Ending balance | [4] | (283) | (371) | (283) |  | (371)
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [5] | (25) | (27) | (45) |  | (60)
Other comprehensive income before reclassifications: gains (losses) | [5] | 25 | (12) | 44 |  | 20
Total other comprehensive income | [5] | 25 | (12) | 45 |  | 21
Ending balance | [5] |  | (39) |  |  | (39)
Total Derivative-Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Purchased Gas | [4] |  |  |  |  | 1
Interest and related charges | [4] | 14 | 16 | 28 |  | 32
Income before income tax expense | [4] | 14 | 16 | 28 |  | 33
Income tax expense (benefit) | [4] | (3) | (4) | (7) |  | (8)
Net Income (Loss) From Continuing Operations | [4] | 11 | 12 | 21 |  | 25
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 | [5] |  |  | 1 |  | 1
Income before income tax expense | [5] |  |  | 1 |  | 1
Net Income (Loss) From Continuing Operations | [5] |  |  | 1 |  | 1
Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [6] | (22) | 32 | 37 |  | 62
Other comprehensive income before reclassifications: gains (losses) | [6] | (27) | 12 | (89) |  | (19)
Total other comprehensive income | [6] | (18) | 9 | (77) |  | (21)
Ending balance | [6] | (40) | 41 | (40) |  | 41
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [7] | (4) | 4 | 4 |  | 8
Other comprehensive income before reclassifications: gains (losses) | [7] | (3) | 3 | (10) |  | (2)
Total other comprehensive income | [7] | (3) | 2 | (11) |  | (2)
Ending balance | [7] | (7) | 6 | (7) |  | 6
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense) | [6] | 12 | (4) | 16 |  | (3)
Income before income tax expense | [6] | 12 | (4) | 16 |  | (3)
Income tax expense (benefit) | [6] | (3) | 1 | (4) |  | 1
Net Income (Loss) From Continuing Operations | [6] | 9 | (3) | 12 |  | (2)
Investment Securities | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense) | [7] |  | (1) | (1) |  |
Income before income tax expense | [7] |  | (1) | (1) |  |
Net Income (Loss) From Continuing Operations | [7] |  | (1) | (1) |  |
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [8] | (1,088) | (1,335) | (1,133) |  | (1,359)
Other comprehensive income before reclassifications: gains (losses) | [8] | 2 |  | 30 |  | 6
Total other comprehensive income | [8] | 18 | 26 | 63 |  | 50
Ending balance | [8] | (1,070) | (1,309) | (1,070) |  | (1,309)
Pension and Other Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense) | [8] | 22 | 35 | 45 |  | 60
Income before income tax expense | [8] | 22 | 35 | 45 |  | 60
Income tax expense (benefit) | [8] | (6) | (9) | (12) |  | (16)
Net Income (Loss) From Continuing Operations | [8] | 16 | 26 | 33 |  | 44
Equity Method Investees |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [9] | (3) | (1) | (4) |  | (1)
Other comprehensive income before reclassifications: gains (losses) | [9] |  |  | 1 |  |
Total other comprehensive income | [9] | 0 |  | 1 |  |
Ending balance | [9] | (3) | (1) | (3) |  | (1)
AOCI |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (1,436) | (1,671) | (1,458) |  | (1,717)
Other comprehensive income before reclassifications: gains (losses) |  | 4 | (4) | (4) |  | 10
Total other comprehensive income |  | 40 | 31 | 62 |  | 77
Ending balance |  | (1,396) | (1,640) | (1,396) |  | (1,640)
AOCI | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (29) | (23) | (41) |  | (52)
Other comprehensive income before reclassifications: gains (losses) |  | 22 | (9) | 34 |  | 18
Total other comprehensive income |  | 22 | (10) | 34 |  | 19
Ending balance |  | (7) | (33) | (7) |  | (33)
AOCI | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Purchased Gas |  |  |  |  |  | 1
Interest and related charges |  | 14 | 16 | 28 |  | 32
Other income (expense) |  | 34 | 31 | 61 |  | 57
Income before income tax expense |  | 48 | 47 | 89 |  | 90
Income tax expense (benefit) |  | (12) | (12) | (23) |  | (23)
Net Income (Loss) From Continuing Operations |  | 36 | 35 | 66 |  | 67
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 |  | 1
Other income (expense) |  |  | (1) | (1) |  |
Income before income tax expense |  |  | (1) |  |  | 1
Net Income (Loss) From Continuing Operations |  |  | (1) |  |  | 1
Interest Rate | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (25) | (27) | (45) |  | (60)
Other comprehensive income before reclassifications: gains (losses) |  | 25 | (12) | 44 |  | 20
Total other comprehensive income |  | $ 25 | (12) | 45 |  | 21
Ending balance |  |  | $ (39) |  |  | (39)
Interest Rate | Reclassification out of Accumulated Other Comprehensive Income | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Interest and related charges |  |  |  | 1 |  | 1
Income before income tax expense |  |  |  | 1 |  | 1
Net Income (Loss) From Continuing Operations |  |  |  | $ 1 |  | $ 1
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See Note 19 for amounts attributable to affiliates.
[4] | Net of $94 million,$119 million, $125 million and $141 million tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.
[5] | Net of $— million, $16 million, $14 million and $21 million tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.
[6] | Net of $14 million, $(10) million, $(12) million and $(21) million tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.
[7] | Net of $3 million, $(2) million, $(2) million and $(3) million tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.
[8] | Net of $376 million, $396 million, $455 million, and $478 million tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.
[9] | Net of $1 million, $1 million, $— and $— tax at June 30, 2022, December 31, 2021, June 30, 2021 and December 31, 2020, respectively.

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