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Credit Risk (Narrative) (Details) $ in Millions		3 Months Ended
		Mar. 31, 2017 USD ($) counterparty	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure		$ 89
Operating Revenue		3,384	$ 2,921
Additional collateral to be posted if the credit related contingent features were triggered				$ 3
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position		4		$ 9
Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Operating Revenue	[1]	$ 1,831	$ 1,890
Credit Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty		0
Amount of exposure for single counterparty		$ 26
Credit Concentration Risk | Wholesale Customers | Sales to wholesale customers | Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty		0
Operating Revenue		$ 28
Amount of exposure related to sales to wholesale customers for single counterparty		$ 5
Credit Concentration Risk | Investment Grade
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)		65.00%
Credit Concentration Risk | Investment Grade | Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)		43.00%
[1] See Note 17 for amounts attributable to affiliates.

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Concentration Risk and Guarantor Obligations [Line Items]

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

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Concentration Risk, Credit Risk, Maximum Exposure for Single Counterparty

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4H
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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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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.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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