Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net deferred gains (losses) on derivative-hedging activities, tax	$ 41	$ 80
Changes in unrealized net gains (losses) on investment securities, tax	(11)	(1)
Changes in unrecognized pension and other postretirement benefit costs, tax	0	(4)
Net derivative (gains) losses-hedging activities, tax	(39)	(100)
Net realized (gains) losses on investment securities, tax	12	7
Net pension and other postretirement benefit costs, tax	(9)	(6)
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	2	(1)
Changes in unrealized net gains (losses) on investment securities, tax	(1)	(2)
Net derivative (gains) losses-hedging activities, tax	0	2
Net realized (gains) losses on investment securities, tax	0	1
Dominion Gas Holdings, LLC
Net deferred gains (losses) on derivative-hedging activities, tax	2	5
Net derivative (gains) losses-hedging activities, tax	0	(3)
Net pension and other postretirement benefit costs, tax	$ (1)	$ (1)

Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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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).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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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).

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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