Fair Value Measurements Fair Value Measurements (Narrative) (Details) (USD $)	1 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013 Project	Jun. 30, 2013 Other Operations And Maintenance Expense	Dec. 31, 2013 Gas, Transmission and Distribution Equipment Fair Value, Measurements, Nonrecurring Level 3	Jun. 30, 2013 Gas, Transmission and Distribution Equipment Other Operations And Maintenance Expense	Jun. 30, 2014 Virginia Electric and Power Company	Jun. 30, 2013 Virginia Electric and Power Company	Jun. 30, 2014 Virginia Electric and Power Company	Jun. 30, 2013 Virginia Electric and Power Company	Jun. 30, 2014 Dominion Gas Holdings, LLC	Jun. 30, 2013 Dominion Gas Holdings, LLC	Jun. 30, 2014 Dominion Gas Holdings, LLC	Jun. 30, 2013 Dominion Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings					$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Impairment charge				49,000,000
Impairment charge, net of tax				29,000,000
Estimated fair values of certain natural gas infrastructure facilities			1,000,000
Impairment charge		6,000,000
Write off of previously capitalized costs, net of tax		$ 4,000,000
Number of development projects canceled	2