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Derivative Instruments and Hedging Activities - Fair Values of Derivative Instruments by Balance Sheet Location (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Gross Derivative Instruments [Member]
Derivative [Line Items]
Derivative assets (current assets)	$ 18	$ 3
Derivative liabilities (current liabilities)	(1)	(4)
Net Derivative (liability) asset	17	(1)
Net Derivative Instruments [Member]
Derivative [Line Items]
Derivative assets (current assets)	18	3
Net Derivative (liability) asset	18	3
Other Derivative Instruments [Member]
Derivative [Line Items]
Derivative assets (current assets)	18	3
Derivative liabilities (current liabilities)	(1)	(4)
Net Derivative (liability) asset	17	(1)
Delmarva Power & Light Co/De [Member] \| Gross Derivative Instruments [Member]
Derivative [Line Items]
Derivative liabilities (current liabilities)	(1)	(4)
Delmarva Power & Light Co/De [Member] \| Other Derivative Instruments [Member]
Derivative [Line Items]
Derivative liabilities (current liabilities)	(1)	(4)
Effects of Cash Collateral and Netting [Member]
Derivative [Line Items]
Derivative liabilities (current liabilities)	1	4
Net Derivative (liability) asset	1	4
Effects of Cash Collateral and Netting [Member] \| Delmarva Power & Light Co/De [Member]
Derivative [Line Items]
Derivative liabilities (current liabilities)	$ 1	$ 4

Fair value, after the effects of master netting arrangements, of a 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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