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Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Net gains (losses) recognized during the period |  | $ 282 | $ (150) | $ 919 | $ 370
Less: Net (gains) losses recognized during the period on securities sold during the period |  | 5 | 1 | 1 | 4
Unrealized gains (losses) recognized during the period on securities still held at period end | [1] | 287 | (149) | 920 | 374
Virginia Electric and Power Company |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Net gains (losses) recognized during the period |  | 145 | (80) | 473 | 189
Less: Net (gains) losses recognized during the period on securities sold during the period |  | 3 | (1) | (2) | 2
Unrealized gains (losses) recognized during the period on securities still held at period end | [1] | $ 148 | $ (81) | $ 471 | $ 191
[1] | Included in other income (expense) and the nuclear decommissioning trust regulatory liability.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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