Related Party Transactions (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Virginia Electric and Power Company		Mar. 31, 2013 Virginia Electric and Power Company		Mar. 31, 2014 Principal Owner Virginia Electric and Power Company	Dec. 31, 2013 Principal Owner Virginia Electric and Power Company	Mar. 31, 2014 Other deferred credits and other liabilities	Dec. 31, 2013 Other deferred credits and other liabilities	Mar. 31, 2014 Other deferred charges and other assets
Related Party Transaction [Line Items]
Amounts due to Dominion									$ 163,000,000	$ 147,000,000
Amounts due from Dominion											8,000,000
Commodity purchases from affiliates			202,000,000		85,000,000
Services provided by affiliates			108,000,000	[1]	96,000,000	[1]
Services provided to affiliates	5,000,000	5,000,000
Short term demand note							159,000,000	97,000,000
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries			$ 0

[1] Amounts are subject to capitalization.