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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
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (10) | $ 25 | $ 2 | $ 21
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (11) | (11) | (33) | (32)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (110) | 268 | 20 | 236
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | (10) | 25 | 2 | 21
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 0 | (1) | 0 | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (109) | 267 | 20 | 235
Interest Rate |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (10) | 25 | 2 | 21
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | (11) | (11) | (33) | (32)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | (110) | 268 | 20 | 236
Interest Rate | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (10) | 25 | 2 | 21
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | 0 | (1) | 0 | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | $ (109) | $ 267 | $ 20 | $ 235
[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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- Definition The increase (decrease) (net) in instruments designated and qualifying as hedging instruments subject to regulatory treatment. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4D Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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- Definition Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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