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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net deferred gains (losses) on derivative-hedging activities, tax | $ 35 | $ (10) | $ (3)
Changes in unrealized net gains (losses) on investment securities, tax | (14) | 5 | (121)
Changes in net unrecognized pension and other postretirement benefit costs, tax | (4) | 75 | 32
Net derivative (gains) losses-hedging activities, tax | 21 | (35) | 18
Net realized (gains) losses on investment securities, tax | 1 | (2) | 21
Net pension and other postretirement benefit costs, tax | (23) | (21) | (32)
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 | 8 | (1) | 3
Changes in unrealized net gains (losses) on investment securities, tax | (2) |  | (16)
Net realized (gains) losses on investment securities, tax | 1 |  | 3
Dominion Energy Gas Holdings, LLC |  |  |
Net deferred gains (losses) on derivative-hedging activities, tax | 22 | 5 | (3)
Changes in net unrecognized pension and other postretirement benefit costs, tax | (13) | 20 | (8)
Net derivative (gains) losses-hedging activities, tax | (2) | (7) | 2
Net pension and other postretirement benefit costs, tax | $ (2) | $ (2) | $ (2)

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