Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 782	$ 1,100
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Total derivatives, not subject to a master netting or similar arrangement	12	2
Derivative liabilities	794us-gaap_DerivativeLiabilities	1,102us-gaap_DerivativeLiabilities
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	348	568
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	196	402
Net Amounts	238	130
Interest rate \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	202	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	16	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	0
Net Amounts	186	0
Commodity \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	87	262
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	34	63
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	1	69
Net Amounts	52	130
Commodity \| Exchange
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	493	838
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	298	505
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	195	333
Net Amounts	0	0
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	80	12
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Total derivatives, not subject to a master netting or similar arrangement	7	0
Derivative liabilities	87	12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	4	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	7
Net Amounts	76	1
Virginia Electric and Power Company \| Interest rate \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	72	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	0
Net Amounts	72	0
Virginia Electric and Power Company \| Commodity \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	8	12
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	4	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	7
Net Amounts	4	1
Dominion Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	9	25
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	0
Net Amounts	9	19
Dominion Gas Holdings, LLC \| Interest rate \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	9	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	0
Net Amounts	9	0
Dominion Gas Holdings, LLC \| Commodity \| Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0	25
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid	0	0
Net Amounts	$ 0	$ 19

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