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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net deferred gains (losses) on derivative-hedging activities, tax | $ (3) | $ (37) | $ (74)
Changes in unrealized net gains (losses) on investment securities, tax | (121) | (53) | 23
Changes in net unrecognized pension and other postretirement benefit costs, tax | 32 | 189 | 29
Net derivative (gains) losses on derivative-hedging activities, tax | 18 | 100 | 68
Net realized gains on investment securities, tax | 21 | 15 | 29
Net pension and other postretirement benefit costs, tax | (32) | (22) | (35)
Changes in other comprehensive income (loss) from equity method investees, tax | (2) |  | 1
Virginia Electric and Power Company |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 3 | 1 | 2
Changes in unrealized net gains (losses) on investment securities, tax | (16) | (7) | 1
Net derivative (gains) losses on derivative-hedging activities, tax | 0 | 0 | 0
Net realized gains on investment securities, tax | 3 | 2 | 4
Dominion Energy Gas Holdings, LLC |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | (3) | 10 | (4)
Changes in net unrecognized pension and other postretirement benefit costs, tax | (8) | 14 | 13
Net derivative (gains) losses on derivative-hedging activities, tax | 3 | (6) | 3
Net pension and other postretirement benefit costs, tax | $ (2) | $ (2) | $ (3)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e,f) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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