Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure for Single Counterparty

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- Definition

Concentration Risk, Number of Customers Provided Service

+ References

No definition available.

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- Definition

Number Of Counterparties

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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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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.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

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-Publisher FASB
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-Section 50
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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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Credit Risk (Narrative) (Details)	12 Months Ended
Credit Risk (Narrative) (Details)	Dec. 31, 2016 USD ($) customer counterparty	Sep. 30, 2016 counterparty	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Concentration Risk [Line Items]
Gross credit exposure	$ 98,000,000
Additional collateral to be posted if the credit-related contingent features were triggered			$ 3,000,000	$ 12,000,000
Amount of collateral posted	0		0
Aggregate fair value of derivative instruments in a liability position and not fully collateralized with cash	9,000,000		$ 49,000,000
Virginia Electric and Power Company
Concentration Risk [Line Items]
Gross credit exposure	42,000,000
Investment Grade Counterparties
Concentration Risk [Line Items]
Number of counterparties \| counterparty		0
Amount of exposure	$ 9,000,000
Investment Grade Counterparties \| Virginia Electric and Power Company
Concentration Risk [Line Items]
Number of counterparties \| counterparty	0
Amount of exposure	$ 6,000,000
Investment Grade Counterparties \| Investment Grade
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	53.00%
Investment Grade Counterparties \| Investment Grade \| Virginia Electric and Power Company
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	33.00%
Customer Concentration Risk \| Sales Revenue, Net \| DTI
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	96.00%
Number of customers \| customer	289
Customer Concentration Risk \| Sales Revenue, Net \| DTI \| Ten Largest Customers
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	40.00%
Number of customers \| customer	10
Customer Concentration Risk \| Sales Revenue, Net \| DTI \| Thirty Largest Customers
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	70.00%
Number of customers \| customer	30
Customer Concentration Risk \| Sales Revenue, Net \| East Ohio
Concentration Risk [Line Items]
Concentration of credit risk (percentage)	98.00%