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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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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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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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Credit Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2014 Counterparty	Dec. 31, 2013	Sep. 30, 2014 Investment Grade Investment grade counterparties	Sep. 30, 2014 Investment Grade Counterparty, A	Sep. 30, 2014 Dominion Gas Holdings, LLC Storage and Transportation Revenue Customer Concentration Risk customer	Sep. 30, 2014 Dominion Gas Holdings, LLC Storage and Transportation Revenue Customer Concentration Risk	Sep. 30, 2014 Dominion Gas Holdings, LLC Ten Largest Customers Storage and Transportation Revenue Customer Concentration Risk customer	Sep. 30, 2014 Dominion Gas Holdings, LLC Thirty Largest Customers Storage and Transportation Revenue Customer Concentration Risk customer	Sep. 30, 2014 Dominion Gas Holdings, LLC Long Term Capacity Contracts Storage and Transportation Revenue Customer Concentration Risk	Sep. 30, 2014 Dominion Gas Holdings, LLC Annual Capacity Contracts Storage and Transportation Revenue Customer Concentration Risk	Sep. 30, 2014 Dominion Gas Holdings, LLC Unsubscribed Firm Transportation Capacity Storage and Transportation Revenue Customer Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure	$ 129
Concentration risk, percentage (percentage)			60.00%	9.00%	94.00%	99.00%	44.00%	77.00%	97.00%	3.00%	1.00%
Number of counterparties	0
Additional collateral to be posted if the credit related contingent features were triggered	117	146
Collateral posted	99	76
Fair value of all derivative instruments not fully collateralized	$ 225	$ 169
Number of customers					235		10	30
Term of contract									2 years