Acquisitions and Dispositions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended			12 Months Ended			1 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2015 acre Field	Dec. 31, 2013 acre Field	Dec. 31, 2014		Dec. 31, 2013 acre Field	Apr. 30, 2015 MW	Jan. 31, 2015 mi	Apr. 01, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 3,294			$ 3,294		$ 3,044	[1]
Proceeds from assignments of Marcellus acreage	27	0
Electric Retail Energy Marketing Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from assignments of Marcellus acreage			187
Gain on sale			100
After tax gain on sale			57
Write off of goodwill			31
Dominion Gas Holdings, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	542			542		542	[2]
Dominion Gas Holdings, LLC | Marcellus Acreage
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of Marcellus Shale development rights conveyed	11,000			11,000	79,000			79,000
Number of natural gas storage fields	1			1	1			1
Total payments to DTI per agreement (up to 200 million)	27			27	200			200
Duration of conveyance of rights					9 years
Cash proceeds from sale of assets				27		16		82
Deferred revenue						85
Gain on sale of assets				27
After tax gain on sale of assets				16
Dominion Gas Holdings, LLC | Marcellus Acreage | Amended Agreement to Extend Conveyance of Development Rights
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of Marcellus Shale development rights conveyed	9,000			9,000
Duration of conveyance of rights				2 years
Deferred revenue	40			40
Deferred revenue recognized from conveyance of rights				43
Deferred revenue recognized from conveyance of rights, after tax				27
Acquisition of Solar Development Projects
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired		100.00%	100.00%
Number of solar development projects			6
Acquisition price			50
Expected cost of projects		446	446
Expected generation capacity of facilities			139
EC&R Solar PV LLC | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired									100.00%
Acquisition price									66
Expected cost of projects									69
Expected generation capacity of facilities									20
EDF Renewable Development, Inc. | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired									100.00%
Acquisition price									106
Expected cost of projects									111
Expected generation capacity of facilities									24
Acquisition of CGT
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired										100.00%
Acquisition price										495
Length of natural gas pipeline										1,500
Net property, plant and equipment acquired										277
Goodwill										250
Goodwill expected to be deductible for income tax purposes										225
Regulatory liabilities assumed										38
Acquisition of CGT | Dominion Midstream Partners, LP | Affiliated Entity | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition price											495
Percentage of equity interests in DCGT contributed in Dominion Midstream											100.00%
Acquisition of CGT | Dominion Midstream Partners, LP | Affiliated Entity | Senior unsecured promissory note payable | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Term of senior unsecured promissory note payable											2 years
Senior unsecured promissory note payable											295
Annual interest rate for senior unsecured promissory note payable											0.60%
Acquisition of CGT | Dominion Midstream Partners, LP | Affiliated Entity | Partnership Interest | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received, common units of Dominion Midstream											5,112,139
Consideration received, value of common units of Dominion Midstream											$ 200
Number of trading days used to determine weighted average trading price											10 days
Price per unit											$ 39.12

[1] Dominion’s Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.

[2] Dominion Gas’ Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.