Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 1,320		$ 799
Total derivatives, not subject to a master netting or similar arrangement	11		29
Derivative Assets	1,331	[1]	828	[1]
Gross Amounts Offset in the Consolidated Balance Sheet	0	[1]	0	[1]
Financial Instruments	953		466
Cash Collateral Received	2		4
Net Amounts	365		329
Derivative assets	1,040		518	[2]
Current Assets
Offsetting Assets [Line Items]
Derivative assets	1,046
Current Derivative Assets
Offsetting Assets [Line Items]
Derivative assets	1,040		518
Assets Held-for-sale
Offsetting Assets [Line Items]
Derivative assets	6
Non Current Derivative Assets
Offsetting Assets [Line Items]
Derivative assets, noncurrent	285		310
Interest rate
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	136		93
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	1		19
Cash Collateral Received	0		0
Net Amounts	135		74
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	286		290
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	97		97
Cash Collateral Received	0		0
Net Amounts	189		193
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	898		416
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	855		350
Cash Collateral Received	2		4
Net Amounts	41		62
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Total derivatives, not subject to a master netting or similar arrangement	0		0
Derivative Assets	44	[1]	6	[1]
Gross Amounts Offset in the Consolidated Balance Sheet	0	[1]	0	[1]
Virginia Electric and Power Company | Current Assets
Offsetting Assets [Line Items]
Derivative assets	44		6
Virginia Electric and Power Company | Interest rate
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	43		0
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	1		0
Cash Collateral Received	0		0
Net Amounts	42		0
Virginia Electric and Power Company | Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	1		6
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	1		3
Cash Collateral Received	0		0
Net Amounts	0		3
Virginia Electric and Power Company | Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44		6
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Financial Instruments	2		3
Cash Collateral Received	0		0
Net Amounts	$ 42		$ 3

[1] At June 30, 2013, the total derivative asset balance contains $1,046 million of current assets, $1,040 million and $6 million of which is presented in current derivative assets and assets held for sale, respectively, in Dominion’s Consolidated Balance Sheet, and $285 million of noncurrent assets, which is presented in other deferred charges and other assets in Dominion’s Consolidated Balance Sheet. At December 31, 2012, the total derivative asset balance contains $518 million of current assets, which is presented in current derivative assets in Dominion’s Consolidated Balance Sheet and $310 million of noncurrent 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.