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Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure for Single Counter Party

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Concentration Risk, Number of Customers Provided Service

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

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Number Of Counterparties

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- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products.

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Credit Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Counterparty	Mar. 31, 2014	Dec. 31, 2014
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure	$ 356
Number of counterparties	0d_NumberOfCounterparties
Additional collateral to be posted if the credit related contingent features were triggered	16		20
Collateral posted	96		1
Fair value of all derivative instruments not fully collateralized	40		49
Gas transportation and storage	471	444
Investment Grade \| Investment grade counterparties
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	89.00%
Investment Grade \| Counterparty, A
Concentration Risk and Guarantor Obligations [Line Items]
Amount of exposure for single counterparty	46
Dominion Gas Holdings, LLC
Concentration Risk and Guarantor Obligations [Line Items]
Gas transportation and storage	412	396
Dominion Gas Holdings, LLC \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	94.00%
Number of customers	248
Dominion Gas Holdings, LLC \| Ten Largest Customers \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	42.00%
Number of customers	10
Dominion Gas Holdings, LLC \| Thirty Largest Customers \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	73.00%
Number of customers	30
Dominion Gas Holdings, LLC \| Long Term Capacity Contracts \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	98.00%
Term of contract	2 years
Dominion Gas Holdings, LLC \| Annual Capacity Contracts \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	2.00%
Dominion Gas Holdings, LLC \| Unsubscribed Firm Transportation Capacity \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	1.00%
DTI \| Thirty Largest Customers \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Gas transportation and storage	$ 201
East Ohio \| Storage and Transportation Revenue \| Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	99.00%