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Debt Instrument, Number of Credit Facilities

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Tax Exempt Long-term Debt

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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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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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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Number of new stock issued during the period.

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Significant Financing Transactions (Narrative) (Details) € in Millions				1 Months Ended			6 Months Ended
	Jul. 01, 2016 shares	Apr. 01, 2016 shares	Jan. 31, 2016 USD ($)	Jul. 31, 2016 USD ($) shares	Apr. 30, 2016 USD ($) shares	Dec. 31, 2014 USD ($) agreement	Jun. 30, 2016 USD ($) facility	Jun. 30, 2015 USD ($)	Jun. 30, 2016 EUR (€) facility	May 31, 2016 USD ($)	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Issuance of common stock							$ 1,458,000,000	$ 647,000,000
Questar Corporation
Debt Instrument [Line Items]
Liabilities incurred			$ 3,900,000,000		$ 3,140,000,000
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
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%
Number of shares issued \| shares		8,500,000.0			8,500,000.0
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
Remarketable Subordinated Notes \| 2013 Series B RSNs
Debt Instrument [Line Items]
Amount of debt										$ 550,000,000
Interest rate percentage										1.18%
Series A Junior Subordinated Notes \| Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate percentage											4.104%
Series B Junior Subordinated Notes \| Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate percentage										2.962%
June 2006 and September 2006 hybrids \| Enhanced Junior Subordinated Notes \| Subsequent Event
Debt Instrument [Line Items]
Amount purchased and cancelled				$ 200,000,000
June 2006 hybrids \| Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Amount purchased and cancelled											$ 38,000,000
June 2006 hybrids \| Enhanced Junior Subordinated Notes \| Subsequent Event
Debt Instrument [Line Items]
Amount purchased and cancelled				125,000,000
September 2006 hybrids \| Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Amount purchased and cancelled											$ 4,000,000
September 2006 hybrids \| Enhanced Junior Subordinated Notes \| Subsequent Event
Debt Instrument [Line Items]
Amount purchased and cancelled				74,000,000
July 2016 Hybrids \| Enhanced Junior Subordinated Notes \| Subsequent Event
Debt Instrument [Line Items]
Amount of debt				$ 800,000,000
Interest rate percentage				5.25%
Virginia Electric and Power Company
Debt Instrument [Line Items]
Number of joint revolving credit facilities \| facility							2		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		2
Dominion Gas Holdings, LLC \| Senior Notes Due in 2031 \| Senior Notes
Debt Instrument [Line Items]
Amount of debt										$ 150,000,000
Interest rate percentage										3.80%
Dominion Gas Holdings, LLC \| Senior Notes Due in 2023 \| Senior Notes
Debt Instrument [Line Items]
Amount of debt							$ 250,000,000
Interest rate percentage							2.875%		2.875%
Dominion Gas Holdings, LLC \| Senior Notes Due in 2026 \| Senior Notes
Debt Instrument [Line Items]
Amount of debt \| €									€ 250
Interest rate percentage							1.45%		1.45%
Dominion Gas Holdings, LLC \| Senior Notes Due in 2026 \| Senior Notes \| Long-term Debt
Debt Instrument [Line Items]
Amount of debt							$ 280,000,000
Amount of senior notes at period end							$ 278,000,000