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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investment Holdings [Line Items] |  |  |  |  |
Net gains recognized during the period |  | $ 40 | $ 243 | $ 610 | $ 267
Less: Net gains recognized during the period on securities sold during the period |  | (17) | (7) | (61) | (42)
Unrealized gains recognized during the period on securities still held at September 30, 2019 and 2018 | [1] | 23 | 236 | 549 | 225
Virginia Electric and Power Company |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Net gains recognized during the period |  | 30 | 106 | 286 | 118
Less: Net gains recognized during the period on securities sold during the period |  | (7) | (3) | (15) | (26)
Unrealized gains recognized during the period on securities still held at September 30, 2019 and 2018 | [1] | $ 23 | $ 103 | $ 271 | $ 92
[1] | Included in other income and the nuclear decommissioning trust regulatory liability.

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- Definition Amount of realized gain 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 -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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