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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (1) | $ 89 | $ 21
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (43) | (57) | (61)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 5 | 855 | 135
Virginia Electric and Power Company |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | (1) | 80 | 17
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (1) | (2) | (3)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 4 | 854 | 130
Commodity |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] |  |  | (1)
Interest Rate |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[4] | (1) | 89 | 21
Amount of Gain (Loss) Reclassified From AOCI to Income | [4] | (43) | (57) | (60)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[4] | 5 | 855 | 135
Interest Rate | Virginia Electric and Power Company |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[4] | (1) | 80 | 17
Amount of Gain (Loss) Reclassified From AOCI to Income | [4] | (1) | (2) | (3)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[4] | $ 4 | $ 854 | $ 130
[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

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