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Credit Risk (Narrative) (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) Counterparty | Dec. 31, 2024 USD ($)
Concentration Risk and Guarantor Obligations [Line Items] |  |
Credit exposure | $ 103,000,000 |
Number of counterparties | Counterparty | 0 |
Amount of exposure for single counterparty | $ 40,000,000 |
Additional collateral to be posted if the credit related contingent features were triggered | 10,000,000 | $ 13,000,000
Collateral derivatives with credit-related contingent provision in a liability position | 0 | 0
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position | 10,000,000 | 13,000,000
Letter of credit as collateral posted for derivatives in liability position | 0 | 0
Virginia Electric and Power Company |  |
Concentration Risk and Guarantor Obligations [Line Items] |  |
Credit exposure | $ 22,000,000 |
Number of counterparties | Counterparty | 0 |
Amount of exposure for single counterparty | $ 10,000,000 |
Additional collateral to be posted if the credit related contingent features were triggered | 8,000,000 | 12,000,000
Collateral derivatives with credit-related contingent provision in a liability position | 0 | 0
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position | 8,000,000 | 12,000,000
Letter of credit as collateral posted for derivatives in liability position | $ 0 | $ 0
Credit Concentration Risk | Investment Grade Counterparty | Virginia Electric and Power Company |  |
Concentration Risk and Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 31.00% |
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty |  |
Concentration Risk and Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 84.00% |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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