Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 728	$ 883
Total derivatives, not subject to a master netting or similar arrangement	4	7
Derivative Assets	732	890
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	584	568
Cash Collateral Received	0	0
Net Amounts	144	315
Interest rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	50	137
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	28	0
Cash Collateral Received	0	0
Net Amounts	22	137
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	195	240
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	73	63
Cash Collateral Received	0	0
Net Amounts	122	177
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	483	506
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	483	505
Cash Collateral Received	0	0
Net Amounts	0	1
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	50	53
Total derivatives, not subject to a master netting or similar arrangement	3	0
Derivative Assets	53	53
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	46	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
Financial Instruments	0	0
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	50	4
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	46	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
Financial Instruments	0	0
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
Financial Instruments	2	6
Net Amounts	0	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
Financial Instruments	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
Financial Instruments	2	6
Net Amounts	$ 0	$ 0