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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 | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance at January 1, | $ 222 | $ 103 | $ (37)
Total realized and unrealized gains (losses): |  |  |
Included in earnings | $ 444 | $ 10 | $ (33)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Electric Fuel And Other Energy Related Purchases | Electric Fuel And Other Energy Related Purchases | Electric Fuel And Other Energy Related Purchases
Included in regulatory assets/liabilities | $ 183 | $ 119 | $ 140
Settlements | (455) | (10) | 33
Purchases | 28 | 0 | 0
Sales | 0 | 0 | (1)
Transfers out of Level 3 | (2) | 9 | 0
Balance at December 31, | 422 | 222 | 103
Virginia Electric and Power Company |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance at January 1, | 102 | 103 | (37)
Total realized and unrealized gains (losses): |  |  |
Included in earnings | $ 382 | $ 4 | $ (33)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Electric Fuel And Other Energy Related Purchases | Electric Fuel And Other Energy Related Purchases | Electric Fuel And Other Energy Related Purchases
Included in regulatory assets/liabilities | $ 102 | $ (1) | $ 140
Settlements | (393) | (4) | 33
Purchases | 28 | 0 | 0
Sales | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Balance at December 31, | 221 | 102 | 103
Operating Revenue |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | 2 | (9) | 0
Operating Revenue | Virginia Electric and Power Company |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | 0 | 0 | 0
Discontinued Operations |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | 0 | 0 | 1
Discontinued Operations | Virginia Electric and Power Company |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | $ 0 | $ 0 | $ 0

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + 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 sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), 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 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: 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 + 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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