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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 | (1) | 30 | 2
Changes in net unrecognized pension and other postretirement benefit costs, tax |  |  | (11) |
Net derivative (gains) losses-hedging activities, tax | $ (3) | $ (2) | (4) | (6)
Net pension and other postretirement benefit costs, tax |  |  | $ (1) | $ (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) 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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