Equity Method Investment, Goodwill

No definition available.

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- Definition

Equity Method Investment, Percentage of Voting Interests Acquired

+ References

No definition available.

+ Details

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- Definition

Equity Method Investment, Realized Gain (Loss) on Disposal, Net of Tax

+ References

No definition available.

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- Definition

Gain (Loss) on Disposition of Business, Net of Tax

+ References

No definition available.

+ Details

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- Definition

Jointly Owned Utility Plant, Number of Members

+ References

No definition available.

+ Details

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- Definition

Long-term Contract for Purchase of Electric Power, Duration of Contract

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Length of Pipeline

+ References

No definition available.

+ Details

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- Definition

Sale of Stock, Percentage of Ownership Sold

+ References

No definition available.

+ Details

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- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Period Type:	instant

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Period Type:	instant

- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 9
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 10.C)
-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C

+ Details

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Balance Type:	na
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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

+ Details

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Balance Type:	credit
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- Definition

The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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Investments (Narrative) (Details) $ in Millions	1 Months Ended					12 Months Ended
Investments (Narrative) (Details) $ in Millions	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2014 member mi	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Gain (Loss) on Investments [Line Items]
Equity earnings on investments						$ 111	$ 56	$ 46
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing						104	83	60
Carrying amount of Company's investments exceeded its shares of underlying equity	$ 260					260	234
Equity method investment goodwill	176					176	162
Oil and Gas Properties \| Blue Racer
Gain (Loss) on Investments [Line Items]
Amount paid to repurchase portion of Western System from Blue Racer	10
Finite Lived Equity Method Investment Basis Difference
Gain (Loss) on Investments [Line Items]
Carrying amount of Company's investments exceeded its shares of underlying equity	$ 84					$ 84	72
Blue Racer
Gain (Loss) on Investments [Line Items]
Amount of consideration					$ 84
Proceeds from Blue Racer					84
Atlantic Coast Pipeline
Gain (Loss) on Investments [Line Items]
Additional membership percentage interest purchased		3.00%
Purchase price for additional membership interests		$ 14
Atlantic Coast Pipeline \| Pipelines \| Jointly Owned Natural Gas Pipeline \| Distribution
Gain (Loss) on Investments [Line Items]
Ownership interest (percentage)	48.00%					48.00%
Length of natural gas pipeline (in miles) \| mi				600
Number of members \| member				3
Duration of contract				20 years
Atlantic Coast Pipeline \| Pipelines \| Duke Energy \| Jointly Owned Natural Gas Pipeline \| Distribution
Gain (Loss) on Investments [Line Items]
Ownership interest (percentage)	47.00%					47.00%
Atlantic Coast Pipeline \| Pipelines \| Southern Company Gas \| Jointly Owned Natural Gas Pipeline \| Distribution
Gain (Loss) on Investments [Line Items]
Ownership interest (percentage)	5.00%					5.00%
Other operations and maintenance expense \| Blue Racer
Gain (Loss) on Investments [Line Items]
After tax gain on sale					34
Dominion Gas Holdings, LLC
Gain (Loss) on Investments [Line Items]
Equity earnings on investments						$ 21	23	21
Company received distribution from Fowler Ridge in connection with non-recourse permanent financing						22	28	$ 20
Carrying amount of Company's investments exceeded its shares of underlying equity	$ 8					8	8
Dominion Gas Holdings, LLC \| Iroquois \| Partnership Interest
Gain (Loss) on Investments [Line Items]
Percentage of non-controlling partnership interest sold			0.65%
Sales price of non-controlling partnership interest			$ 7
Amount of gain from sale			5
Amount of after tax gain from sale			$ 3
Dominion Gas Holdings, LLC \| Blue Racer
Gain (Loss) on Investments [Line Items]
Proceeds from Blue Racer					17
Extinguishment of affiliated current borrowings					67
Dominion Gas Holdings, LLC \| Other operations and maintenance expense \| Blue Racer
Gain (Loss) on Investments [Line Items]
Gain from sale					59
After tax gain on sale					35
Write off of goodwill					$ 3
Categories of Investments, Marketable Securities, Trading Securities
Gain (Loss) on Investments [Line Items]
Investments held in our rabbi trusts	$ 104					$ 104	$ 100