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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net deferred gains (losses) on derivative-hedging activities, tax | $ 37 | $ 9 | $ 69 | $ (17)
Changes in unrealized net gains (losses) on investment securities, tax | (2) | 1 | (13) | 7
Changes in net unrecognized pension and other postretirement benefit costs, tax | 4 |  | (45) |
Net derivative (gains) losses-hedging activities, tax | 1 | (10) | 19 | (24)
Net realized (gains) losses on investment securities, tax | 1 | 0 | 1 | (1)
Net pension and other postretirement benefit costs, tax | (6) | (7) | (17) | (15)
Changes in other comprehensive income (loss) from equity method investees, tax |  |  |  | (1)
Virginia Electric and Power Company |  |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 5 | (1) | 11 | (3)
Changes in unrealized net gains (losses) on investment securities, tax | (1) |  | (2) | 1
Net realized (gains) losses on investment securities, tax | 1 | 0 | 1 |
Dominion Energy Gas Holdings, LLC |  |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 13 | (2) | 30 | 1
Changes in net unrecognized pension and other postretirement benefit costs, tax |  |  | (11) |
Net derivative (gains) losses-hedging activities, tax | $ (3) | $ (2) | $ (3) | (6)
Net pension and other postretirement benefit costs, tax |  |  |  | $ (1)

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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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