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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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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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Face (par) amount of the original debt instrument that was repurchased.

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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 inflow from the additional capital contribution to the entity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Significant Financing Transactions (Narrative) (Details)			1 Months Ended		3 Months Ended
	Apr. 01, 2016 shares	Jan. 31, 2016 USD ($)	Apr. 30, 2016 USD ($) shares	Dec. 31, 2014 USD ($) Agreement	Mar. 31, 2016 USD ($) Facility	Mar. 31, 2015 USD ($)	Jun. 07, 2013 USD ($)
Debt Instrument [Line Items]
Issuance of common stock					$ 75,000,000	$ 295,000,000
Questar Corporation
Debt Instrument [Line Items]
Liabilities incurred		$ 3,900,000,000
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
Common stock reserved for issuance in connection with stock purchase contracts					$ 200,000,000
Subsequent Event \| Questar Corporation
Debt Instrument [Line Items]
Liabilities incurred			$ 3,140,000,000
Subsequent Event \| Underwritten Public Offering
Debt Instrument [Line Items]
Number of common units issued \| shares			10,200,000
Issuance of common stock			$ 756,000,000
Remarketable Subordinated Notes \| 2013 Series A RSNs
Debt Instrument [Line Items]
Amount of debt							$ 550,000,000
Interest rate percentage							1.07%
Remarketable Subordinated Notes \| 2013 Series A RSNs \| Subsequent Event
Debt Instrument [Line Items]
Number of shares issued \| shares	8,500,000.0		8,500,000.0
Enhanced Junior Subordinated Notes \| Series A Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate percentage					4.104%
Enhanced Junior Subordinated Notes \| June 2006 hybrids
Debt Instrument [Line Items]
Amount purchased and cancelled					$ 38,000,000
Enhanced Junior Subordinated Notes \| September 2006 hybrids
Debt Instrument [Line Items]
Amount purchased and cancelled					$ 4,000,000
Virginia Electric and Power Company
Debt Instrument [Line Items]
Number of joint revolving credit facilities \| Facility					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 \| Facility					2