Income Taxes (The Companies Deferred Income Taxes Components) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Total deferred income tax assets	$ 2,142	$ 2,505
Total deferred income tax liabilities	8,463	7,716
Total deferred income taxes:
Plant and equipment, primarily depreciation method and basis differences	5,383	4,601
Nuclear decommissioning	1,136	994
Deferred state income taxes	606	474
Federal benefit of deferred state income taxes	(212)	(166)
Deferred fuel, purchased energy and gas costs	(33)	3
Pension benefits	435	231
Other postretirement benefits	(78)	(171)
Loss and credit carryforwards	(797)	(656)
Valuation allowances	69	93
Partnership basis differences	125	174
Other	(313)	(366)
Total net deferred income tax liabilities	6,321	5,211
Virginia Electric and Power Company
Income Tax Contingency [Line Items]
Total deferred income tax assets	462	466
Total deferred income tax liabilities	4,498	4,238
Total deferred income taxes:
Plant and equipment, primarily depreciation method and basis differences	3,628	3,394
Nuclear decommissioning	441	407
Deferred state income taxes	285	265
Federal benefit of deferred state income taxes	(100)	(93)
Deferred fuel, purchased energy and gas costs	(50)	(16)
Pension benefits	(52)	(17)
Other postretirement benefits	(3)	(7)
Loss and credit carryforwards	(106)	(77)
Valuation allowances	0	0
Partnership basis differences	0	0
Other	(7)	(84)
Total net deferred income tax liabilities	$ 4,036	$ 3,772