Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 732	$ 883
Total derivatives, not subject to a master netting or similar arrangement	7	7
Derivative Assets	739	890
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	631	568
Cash Collateral Received	0	0
Net Amounts	101	315
Interest rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	57	137
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	30	0
Cash Collateral Received	0	0
Net Amounts	27	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	122	63
Cash Collateral Received	0	0
Net Amounts	73	177
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	480	506
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	479	505
Cash Collateral Received	0	0
Net Amounts	1	1
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	12	53
Total derivatives, not subject to a master netting or similar arrangement	3	0
Derivative Assets	15	53
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	8	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	11	4
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	4	4
Cash Collateral Received	0	0
Net Amounts	7	0
Virginia Electric and Power Company | Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	1	1
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amounts	1	1
Dominion Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	3	40
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	3	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	3	6
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Financial Instruments	3	6
Net Amounts	$ 0	$ 0