Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting Liabilities [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 640		$ 650
Total derivatives, not subject to a master netting arrangement or similar arrangement	4		11
Derivative Liabilities	644	[1]	661	[1]
Gross Amounts Offset in the Consolidated Balance Sheet	0	[1]	0	[1]
Financial Instruments	494		466
Cash Collateral Paid	70		63
Net Amounts	76		121
Derivative liabilities	556		510	[2]
Current Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities	556		510
Non Current Derivative Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities, noncurrent	88		151
Interest rate
Offsetting Liabilities [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	33		66
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	15		19
Cash Collateral Paid	0		0
Net Amounts	18		47
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	145		191
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	74		97
Cash Collateral Paid	13		20
Net Amounts	58		74
Commodity | Exchange
Offsetting Liabilities [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	462		393
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	405		350
Cash Collateral Paid	57		43
Net Amounts	$ 0		$ 0

[1] The total derivative liability balance contains $556 million of current liabilities, which is presented in current derivative liabilities in Dominion’s Consolidated Balance Sheet, and $88 million of noncurrent derivative liabilities, which is presented in the other deferred credits and other liabilities in Dominion’s Consolidated Balance Sheet.

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