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Fair Value Measurements (Net Change in the Assets and Liabilities Measured at Fair Value on a Recurring Basis and Included in the Level 3 Fair Value Category) (Detail) - Commodity - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Beginning balance | $ 480 | $ 62 | $ 222 | $ 103
Total realized and unrealized gains (losses): |  |  |  |
Included in earnings |  | (6) |  | (8)
Included in earnings | $ 181 | $ 29 | $ 346 | $ 12
Revenue, Product and Service [Extensible Enumeration] | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear
Included in regulatory assets/liabilities | $ 2 | $ 88 | $ 243 | $ 49
Settlements | (181) | (29) | (346) | (12)
Purchases |  |  | 17 |
Ending balance | 482 | 144 | 482 | 144
Virginia Electric and Power Company |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Beginning balance | 245 | 74 | 102 | 103
Total realized and unrealized gains (losses): |  |  |  |
Included in earnings | $ 142 | $ 27 | $ 293 | $ 10
Revenue, Product and Service [Extensible Enumeration] | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear | us-gaap:RegulatedOperatingRevenueElectricNonNuclear
Included in regulatory assets/liabilities | $ 26 | $ 41 | $ 152 | $ 12
Settlements | (142) | (27) | (293) | (10)
Purchases | 0 | 0 | 17 | 0
Ending balance | $ 271 | $ 115 | $ 271 | $ 115

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- Definition Fair value, net derivative asset (liability) measured on recurring basis, unobservable inputs reconciliation, gain (loss) included in regulatory assets and liabilities. + References No definition available. + Details
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- Definition Fair value net derivative asset liability measured on recurring basis unobservable inputs reconciliation regulated operating revenue. + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Total Gains Losses Realized Unrealized [Abstract] + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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