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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
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Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (12) | $ 33
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (11) | (14)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (120) | 279
Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | (12) | 26
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 0 | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (120) | 279
Interest Rate Contract |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (12) | 33
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | (11) | (14)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | (120) | 279
Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[3] | (12) | 26
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | 0 | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | $ (120) | $ 279
[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 Statement 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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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