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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net deferred gains (losses) on derivative-hedging activities, tax | $ (10) | $ (3) | $ (37)
Changes in unrealized net gains (losses) on investment securities, tax | 5 | (121) | (53)
Changes in net unrecognized pension and other postretirement benefit costs, tax | 75 | 32 | 189
Net derivative (gains) losses-hedging activities, tax | (35) | 18 | 100
Net realized (gains) losses on investment securities, tax | (2) | 21 | 15
Net pension and other postretirement benefit costs, tax | (21) | (32) | (22)
Changes in other comprehensive income (loss) from equity method investees, tax | (1) | (2) |
Virginia Electric and Power Company |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | (1) | 3 | 1
Changes in unrealized net gains (losses) on investment securities, tax |  | (16) | (7)
Net realized (gains) losses on investment securities, tax |  | 3 | 2
Dominion Energy Gas Holdings, LLC |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 5 | (3) | 10
Changes in net unrecognized pension and other postretirement benefit costs, tax | 20 | (8) | 14
Net derivative (gains) losses-hedging activities, tax | (7) | 2 | (6)
Net pension and other postretirement benefit costs, tax | $ (2) | $ (2) | $ (2)

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