Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 1,092		$ 650
Total derivatives, not subject to a master netting or similar arrangement	8		11
Financial Instruments	953		466
Cash Collateral Paid	80		63
Net Amounts	59		121
Derivative liabilities	950		510	[1]
Gross Amounts Offset in the Consolidated Balance Sheet	0	[2]	0	[2]
Derivative Liabilities	1,100	[2]	661	[2]
Current Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities	950		510
Non Current Derivative Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities, noncurrent	150		151
Interest rate
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1		66
Financial Instruments	1		19
Cash Collateral Paid	0		0
Net Amounts	0		47
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	179		191
Financial Instruments	97		97
Cash Collateral Paid	23		20
Net Amounts	59		74
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Commodity | Exchange
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	912		393
Financial Instruments	855		350
Cash Collateral Paid	57		43
Net Amounts	0		0
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	33		34
Total derivatives, not subject to a master netting or similar arrangement	0		0
Financial Instruments	2		3
Cash Collateral Paid	24		2
Net Amounts	7		29
Gross Amounts Offset in the Consolidated Balance Sheet	0	[2]	0	[2]
Derivative Liabilities	33	[2]	34	[2]
Virginia Electric and Power Company | Current Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities	33		33
Virginia Electric and Power Company | Non Current Derivative Liabilities
Offsetting Liabilities [Line Items]
Derivative liabilities, noncurrent			1
Virginia Electric and Power Company | Interest rate
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1		25
Financial Instruments	1		0
Cash Collateral Paid	0		0
Net Amounts	0		25
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Virginia Electric and Power Company | Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	31		7
Financial Instruments	1		3
Cash Collateral Paid	23		0
Net Amounts	7		4
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Virginia Electric and Power Company | Commodity | Exchange
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1		2
Financial Instruments	0		0
Cash Collateral Paid	1		2
Net Amounts	0		0
Gross Amounts Offset in the Consolidated Balance Sheet	$ 0		$ 0

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

[2] At June 30, 2013, the total derivative liability balance contains $950 million of current liabilities, which is presented in current derivative liabilities in Dominion’s Consolidated Balance Sheet, and $150 million of noncurrent liabilities, which is presented in the other deferred credits and other liabilities in Dominion’s Consolidated Balance Sheet. At December 31, 2012, the total derivative liability balance contains $510 million of current liabilities, which is presented in current derivative liabilities in Dominion’s Consolidated Balance Sheet and $151 million of noncurrent derivative liabilities, which is presented in other deferred credits and other liabilities in Dominion’s Consolidated Balance Sheet.