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Significant Financing Transactions - (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014 Agreement	Apr. 30, 2015
Debt Instrument [Line Items]
Issuance of common stock	$ 295,000,000	$ 0
Virginia Electric and Power Company
Debt Instrument [Line Items]
Number of joint revolving credit facilities	2
Credit facility	120,000,000
Virginia Electric and Power Company \| Tax Exempt Debt
Debt Instrument [Line Items]
Variable rate tax-exempt financings	119,000,000
Dominion Gas Holdings, LLC
Debt Instrument [Line Items]
Number of joint revolving credit facilities	2
Shelf Registration for Sale of Common Stock through At-the-market Program
Debt Instrument [Line Items]
Number of sales agency agreements			4
Aggregate amount of common stock in which the company may offer under SEC shelf registration (up to $500 million)			500,000,000
Number of sales agents	2
Shares issued through at the market issuances	2,900,000
Issuance of common stock	219,000,000
Fees and commissions paid	2,000,000
Shelf Registration for Sale of Common Stock through At-the-market Program \| Subsequent Event
Debt Instrument [Line Items]
Shares issued through at the market issuances				600,000
Issuance of common stock				43,000,000
Fees and commissions paid				$ 1,000,000
Common stock reserved for issuance in connection with stock purchase contracts				235