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Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net gains (losses) recognized during the period |  | $ 459 | $ 226
Less: Net (gains) losses recognized during the period on securities sold during the period |  | (10) | 2
Unrealized gains (losses) recognized during the period on securities still held at period end | [1] | 449 | 228
Virginia Electric and Power Company |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net gains (losses) recognized during the period |  | 242 | 116
Less: Net (gains) losses recognized during the period on securities sold during the period |  | (9) | 1
Unrealized gains (losses) recognized during the period on securities still held at period end | [1] | $ 233 | $ 117
[1] | Included in other income (expense) and the nuclear decommissioning trust regulatory liability.

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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//1943274/2147483586/944-220-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 unrealized 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)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-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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