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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net deferred gains (losses) on derivatives-hedging activities, tax | $ (37) | $ (74) | $ (20)
Changes in unrealized net gains (losses) on investment securities, tax | (53) | 23 | (59)
Changes in net unrecognized pension and other postretirement benefit costs, tax | 189 | 29 | 189
Net derivative (gains) losses-hedging activities, tax | 100 | 68 | (59)
Net realized (gains) losses on investment securities, tax | 15 | 29 | 33
Net pension and other postretirement benefit costs, tax | (22) | (35) | (24)
Changes in other comprehensive income (loss) from equity method investees, tax | 0 | 1 | 3
Virginia Electric and Power Company |  |  |
Net deferred gains (losses) on derivatives-hedging activities, tax | 1 | 2 | 2
Changes in unrealized net gains (losses) on investment securities, tax | (7) | 1 | (9)
Net derivative (gains) losses-hedging activities, tax | 0 | 0 | 2
Net realized (gains) losses on investment securities, tax | 2 | 4 | 4
Dominion Gas Holdings, LLC |  |  |
Net deferred gains (losses) on derivatives-hedging activities, tax | 10 | (4) | 19
Changes in net unrecognized pension and other postretirement benefit costs, tax | 14 | 13 | 6
Net derivative (gains) losses-hedging activities, tax | (6) | 3 | (5)
Net pension and other postretirement benefit costs, tax | $ (2) | $ (3) | $ (3)

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