Dispositions (Schedule of Disposal Groups, Including Discontinued Operations, Income Statement) (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012		Mar. 31, 2013 Brayton Point and Kincaid	Mar. 31, 2012 Brayton Point and Kincaid	Mar. 31, 2013 State Line and Salem Harbor
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Current assets	$ 109
Property, plant and equipment, net	187
Other assets	17
Total assets	313
Current liabilities	28
Asset retirement obligations	19
Other liabilities	1
Total liabilities	48	0	[1]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Operating revenue				154	65	30
Income (loss) before income taxes				$ 1	$ (22)	$ 2

[1] Dominion’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.