Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Issuance of common stock		$ 265	$ 38	$ 74
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Commodity purchases from affiliates		368	376	373
Services provided by affiliates		399	393	469
Services provided to affiliates		19	21	19
Purchased nuclear fuel-related inventory	39
Outstanding borrowings, net of repayments, under the Dominion money pool for Virginia Power's nonregulated subsidiaries	187	192	187
Common stock issued (shares)				33,013
Issuance of common stock				1,000
Dominion | Virginia Electric and Power Company
Related Party Transaction [Line Items]
Other Short-term Borrowings		$ 243