Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 1,252	$ 1,100
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Total derivatives, not subject to a master netting or similar arrangement	4	2
Derivative Liabilities	1,256	1,102
Derivative, Collateral, Right to Reclaim Securities	631	568
Derivative, Collateral, Right to Reclaim Cash	334	402
Net Amounts	287	130
Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	109	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	30	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Net Amounts	79	0
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	334	262
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	122	63
Derivative, Collateral, Right to Reclaim Cash	4	69
Net Amounts	208	130
Commodity | Exchange
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	809	838
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	479	505
Derivative, Collateral, Right to Reclaim Cash	330	333
Net Amounts	0	0
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	22	12
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Total derivatives, not subject to a master netting or similar arrangement	1	0
Derivative Liabilities	23	12
Derivative, Collateral, Right to Reclaim Securities	4	4
Derivative, Collateral, Right to Reclaim Cash	0	7
Net Amounts	18	1
Virginia Electric and Power Company | Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	15	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Net Amounts	15	0
Virginia Electric and Power Company | Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	7	12
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	4	4
Derivative, Collateral, Right to Reclaim Cash	0	7
Net Amounts	3	1
Dominion Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	32	25
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	3	6
Net Amounts	29	19
Dominion Gas Holdings, LLC | Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	19	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	0	0
Net Amounts	19	0
Dominion Gas Holdings, LLC | Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	13	25
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivative, Collateral, Right to Reclaim Securities	3	6
Net Amounts	$ 10	$ 19