Significant Accounting Policies (Depreciation Rates and Estimated Useful Life) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Generation
Depreciation rates	2.71%	2.62%	2.68%
Generation | Virginia Electric and Power Company
Depreciation rates	2.71%	2.62%	2.68%
Transmission
Depreciation rates	2.36%	2.17%	2.26%
Transmission | Virginia Electric and Power Company
Depreciation rates	2.28%	1.98%	2.03%
Distribution
Depreciation rates	3.13%	3.17%	3.19%
Distribution | Virginia Electric and Power Company
Depreciation rates	3.33%	3.32%	3.33%
Storage
Depreciation rates	2.43%	2.59%	2.64%
Gas gathering and processing
Depreciation rates	2.39%	2.49%	2.52%
General and other
Depreciation rates	3.82%	4.55%	4.66%
General and other | Virginia Electric and Power Company
Depreciation rates	3.51%	4.32%	4.38%
Merchant generation-nuclear
Property, Plant and Equipment, Useful Life	44 years
Minimum | General and other
Property, Plant and Equipment, Useful Life	5 years
Minimum | Merchant generation-other
Property, Plant and Equipment, Useful Life	15 years
Maximum | General and other
Property, Plant and Equipment, Useful Life	59 years
Maximum | Merchant generation-other
Property, Plant and Equipment, Useful Life	36 years