Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 667	$ 704
Total derivatives, not subject to a master netting or similar arrangement	12	15
Derivative Asset	679us-gaap_DerivativeAssets	719us-gaap_DerivativeAssets
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	389	348
Cash Collateral Received	0	34
Net Amounts	278	322
Interest rate \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	18	24
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	18	16
Cash Collateral Received	0	0
Net Amounts	0	8
Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	323	382
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	45	34
Cash Collateral Received	0	34
Net Amounts	278	314
Commodity \| Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	326	298
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	326	298
Cash Collateral Received	0	0
Net Amounts	0	0
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	82	106
Total derivatives, not subject to a master netting or similar arrangement	24	7
Derivative Asset	106	113
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	78	102
Virginia Electric and Power Company \| Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	82	106
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	78	102
Dominion Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	3	2
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	3	0
Cash Collateral Received	0	0
Net Amounts	0	2
Dominion Gas Holdings, LLC \| Commodity \| Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	3	2
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	3	0
Cash Collateral Received	0	0
Net Amounts	$ 0	$ 2

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