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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives |  | $ (5) | [1] | $ (10) | $ (26) | [1] | $ 2 | [1]
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (10) |  | (11) | (30) |  | (33) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment |  | (29) | [2] | (110) | (101) | [2] | 20 | [2]
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives |  | (2) | [1] | (10) | (9) | [1] | 2 | [1]
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 0 |  | 0 | 0 |  | 0 |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment |  | (29) | [2] | (109) | (102) | [2] | 20 | [2]
Interest Rate |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (5) |  | (10) | (26) |  | 2 |
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | (10) |  | (11) | (30) |  | (33) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | (29) |  | (110) | (101) |  | 20 |
Interest Rate | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (2) |  | (10) | (9) |  | 2 |
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | 0 |  | 0 | 0 |  | 0 |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | $ (29) |  | $ (109) | $ (102) |  | $ 20 |
[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 the Companies’ Consolidated Statements of Income are classified in interest and related charges.

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