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Regulatory Assets and Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Entity Information [Line Items]
Regulatory assets past expenditures not earning return	$ 128
Period expenditures not earning return are to be recovered	2 years
Virginia Electric and Power Company
Entity Information [Line Items]
Regulatory assets past expenditures not earning return	$ 84

Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base.

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