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Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investment Holdings [Line Items] |  |  |  |  |
Net gains (losses) recognized during the period |  | $ 610 | $ 156 | $ (288) | $ 570
Less: Net (gains) losses recognized during the period on securities sold during the period |  | (5) | (25) | 9 | (44)
Unrealized gains (losses) recognized during the period on securities still held at June 30, 2020 and 2019 | [1] | 605 | 131 | (279) | 526
Virginia Electric and Power Company |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Net gains (losses) recognized during the period |  | 269 | 70 | (154) | 256
Less: Net (gains) losses recognized during the period on securities sold during the period |  | (3) | (7) | 3 | (8)
Unrealized gains (losses) recognized during the period on securities still held at June 30, 2020 and 2019 | [1] | $ 266 | $ 63 | $ (151) | $ 248
[1] | Included in other income 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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