Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 741		$ 799
Total derivatives, not subject to a master netting arrangement or similar arrangement	10		29
Derivative Assets	751	[1]	828	[1]
Gross Amounts Offset in the Consolidated Balance Sheet	0	[1]	0	[1]
Financial Instruments	494		466
Cash Collateral Received	1		4
Net Amounts	246		329
Derivative assets	527		518	[2]
Current Assets
Offsetting Assets [Line Items]
Derivative assets	534
Current Derivative Assets
Offsetting Assets [Line Items]
Derivative assets	527		518
Assets Held-for-sale
Offsetting Assets [Line Items]
Derivative assets	7
Non Current Derivative Assets
Offsetting Assets [Line Items]
Derivative assets, noncurrent	217		310
Interest rate
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	78		93
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	15		19
Cash Collateral Received	0		0
Net Amounts	63		74
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	245		290
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	74		97
Cash Collateral Received	0		0
Net Amounts	171		193
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	418		416
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	405		350
Cash Collateral Received	1		4
Net Amounts	$ 12		$ 62

[1] The total derivative asset balance contains $534 million of current assets, $527 million and $7 million which is presented in current derivative assets and assets held for sale, respectively, in Dominion’s Consolidated Balance Sheet, and $217 million of noncurrent derivative assets, which is presented in other deferred charges and other assets 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.