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Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Detail) - Cash Flow Hedges - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ 89 |  | $ 21 |  | $ (320)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (57) |  | (61) |  | (302)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 855 |  | 135 |  | (332)
Virginia Electric and Power Company |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 80 |  | 17 |  | (37)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (2) |  | (3) |  | (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 854 |  | 130 |  | (338)
Commodity |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] |  |  |  |  | 0
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  | (1) | [3] | 23
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] |  |  |  |  | 0
Commodity | Virginia Electric and Power Company |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] |  |  |  |  | 0
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] |  |  |  |  | 0
Commodity | Operating Revenue |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | 25
Commodity | Purchased Gas |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | (4)
Commodity | Discontinued operations |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | 2
Interest rate |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 89 | [4] | 21 | [4] | (309)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (57) | [4] | (60) | [4] | (319)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 855 | [4] | 135 | [4] | (332)
Interest rate | Virginia Electric and Power Company |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 80 | [4] | 17 | [4] | (37)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (2) | [4] | (3) | [4] | (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | $ 854 | [4] | $ 130 | [4] | (338)
Interest rate | Discontinued operations |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | (236)
Interest rate | Interest and Related Charges |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | (83)
Interest rate | Interest and Related Charges | Virginia Electric and Power Company |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] |  |  |  |  | (37)
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  |  | (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] |  |  |  |  | (338)
Foreign currency exchange rate |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[5] |  |  |  |  | (11)
Amount of Gain (Loss) Reclassified From AOCI to Income | [5] |  |  |  |  | (6)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[5] |  |  |  |  | 0
Foreign currency exchange rate | Virginia Electric and Power Company |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[5] |  |  |  |  | $ 0
[1] | Amounts deferred into AOCI have no associated effect in the Companies' Consolidated Statements of Income.
[2] | Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Companies' Consolidated Statements of Income.
[3] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in purchased gas.
[4] | Amounts recorded in the Companies' Consolidated Statements of Income are classified in interest and related charges.
[5] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in discontinued operations.

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