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Debt Instrument, Number of Credit Facilities

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Number Of Sales Agency Agreements

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Share Based Compensation Arrangement By Share Based Payment Award Equity Issued

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Tax Exempt Long-term Debt

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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-Glossary Financing Activities

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The cash inflow from the additional capital contribution to the entity.

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Number of new stock issued during the period.

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Significant Financing Transactions (Narrative) (Details) shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2014 USD ($) Agreement	Jun. 30, 2015 USD ($) Facility shares	Mar. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) Facility shares	Jun. 30, 2014 USD ($)	May. 31, 2015 USD ($)
Debt Instrument [Line Items]
Issuance of common stock				$ 647,000,000	$ 71,000,000
Shelf Registration for Sale of Common Stock through At-the-market Program
Debt Instrument [Line Items]
Number of sales agency agreements \| Agreement	4
Aggregate amount of common stock in which the company may offer under SEC shelf registration (up to $500 million)	$ 500,000,000
Shares issued through at-the-market issuances \| shares		1.1	2.9
Issuance of common stock		$ 78,000,000	$ 219,000,000
Fees and commissions paid		1,000,000	$ 2,000,000
Common stock reserved for issuance in connection with stock purchase contracts		200,000,000		$ 200,000,000
Registered Underwritten Public Offering
Debt Instrument [Line Items]
Shares issued through at-the-market issuances \| shares				2.8
Issuance of common stock				$ 202,000,000
Senior Notes \| Senior Notes Maturing in 2025
Debt Instrument [Line Items]
Amount of senior notes						$ 350,000,000
Interest rate percentage						3.10%
Senior Notes \| Senior Notes Maturing in 2045
Debt Instrument [Line Items]
Amount of senior notes						$ 350,000,000
Interest rate percentage						4.20%
Senior Notes \| Senior Notes Maturing in 2018
Debt Instrument [Line Items]
Amount of senior notes		$ 500,000,000		$ 500,000,000
Interest rate percentage		1.90%		1.90%
Senior Notes \| 5.25% Senior Notes Due 2033
Debt Instrument [Line Items]
Amount of senior notes		$ 510,000,000		$ 510,000,000
Interest rate percentage		5.25%		5.25%
Redemption percentage				100.00%
Virginia Electric and Power Company
Debt Instrument [Line Items]
Number of joint revolving credit facilities \| Facility		2		2
Credit facility		$ 120,000,000		$ 120,000,000
Virginia Electric and Power Company \| Tax Exempt Debt
Debt Instrument [Line Items]
Variable rate tax-exempt financings		$ 119,000,000		$ 119,000,000
Dominion Gas Holdings, LLC
Debt Instrument [Line Items]
Number of joint revolving credit facilities \| Facility		2		2