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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net deferred gains (losses) on derivative-hedging activities, tax | $ 11 | $ (17) | $ (26) | $ (44)
Changes in unrealized net gains (losses) on investment securities, tax | 2 | (18) | 6 | (53)
Net derivative (gains) losses-hedging activities, tax | (11) | 11 | (14) | 25
Net realized gains on investment securities, tax | (1) | 2 | (1) | 18
Net pension and other postretirement benefit costs, tax | (7) | (10) | (8) | (18)
Changes in other comprehensive income (loss) from equity method investees, tax | (1) |  | (1) | (1)
Virginia Electric and Power Company |  |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax |  | 2 | (2) | 2
Changes in unrealized net gains (losses) on investment securities, tax |  | (3) | 1 | (7)
Net realized (gains) losses on nuclear decommissioning trust funds, tax |  |  |  | 2
Dominion Energy Gas Holdings, LLC |  |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 7 | (7) | 3 | (1)
Net derivative (gains) losses-hedging activities, tax | $ (5) | $ 7 | (4) |
Net pension and other postretirement benefit costs, tax |  |  | $ (1) | $ (1)

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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + 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=114867106&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + 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=114867106&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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