Commitment and Contingencies (Schedule of Long Term Purchase Commitments) (Details) (Virginia Electric and Power Company, USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Long-term Purchase Commitment [Line Items]
Present value of total commitment for capacity payments	$ 1,100,000,000
Purchased electric capacity
Long-term Purchase Commitment [Line Items]
2014	336,000,000	[1]
2015	316,000,000	[1]
2016	253,000,000	[1]
2017	159,000,000	[1]
2018	104,000,000	[1]
Thereafter	163,000,000	[1]
Total	1,331,000,000	[1]
Payments	345,000,000		337,000,000	338,000,000
Energy payments
Long-term Purchase Commitment [Line Items]
Payments	$ 236,000,000		$ 214,000,000	$ 275,000,000

[1] Commitments represent estimated amounts payable for capacity under power purchase contracts with qualifying facilities and independent power producers, the last of which ends in 2021. Capacity payments under the contracts are generally based on fixed dollar amounts per month, subject to escalation using broad-based economic indices. At December 31, 2013, the present value of Virginia Power's total commitment for capacity payments is $1.1 billion. Capacity payments totaled $345 million, $337 million, and $338 million, and energy payments totaled $236 million, $214 million, and $275 million for 2013, 2012 and 2011, respectively.