Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 704	$ 883
Total derivatives, not subject to a master netting or similar arrangement	15	7
Derivative Asset	719us-gaap_DerivativeAssets	890us-gaap_DerivativeAssets
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	348	568
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	34	0
Net Amounts	322	315
Interest rate \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	24	137
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 Received	0	0
Net Amounts	8	137
Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	382	240
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 Received	34	0
Net Amounts	314	177
Commodity \| Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	298	506
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 Received	0	0
Net Amounts	0	1
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	106	53
Total derivatives, not subject to a master netting or similar arrangement	7	0
Derivative Asset	113	53
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 Received	0	0
Net Amounts	102	49
Virginia Electric and Power Company \| Interest rate \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	48
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 Received	0	0
Net Amounts	0	48
Virginia Electric and Power Company \| Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	106	4
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 Received	0	0
Net Amounts	102	0
Virginia Electric and Power Company \| Commodity \| Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	1
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 Received	0	0
Net Amounts	0	1
Dominion Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2	40
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 Received	0	0
Net Amounts	2	34
Dominion Gas Holdings, LLC \| Interest rate \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	34
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 Received	0	0
Net Amounts	0	34
Dominion Gas Holdings, LLC \| Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2	6
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 Received	0	0
Net Amounts	$ 2	$ 0

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