Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Details) (Fair Value - Derivatives not under Hedge Accounting, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 24	[1]	$ 30	[1]
Interest rate
Amount of Gain (Loss) Recognized in Income on Derivatives	0	[1],[2]	(2)	[1],[2]
Commodity | Operating revenue
Amount of Gain (Loss) Recognized in Income on Derivatives	3	[1]	69	[1]
Commodity | Purchased gas
Amount of Gain (Loss) Recognized in Income on Derivatives	18	[1]	(10)	[1]
Commodity | Electric fuel and other energy-related purchases
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 3	[1]	$ (27)	[1]

[1] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion’s Consolidated Statements of Income.

[2] Amounts recorded in Dominion’s Consolidated Statements of Income are classified in interest and related charges.