Derivative Instruments And Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Of Derivative Instruments By Balance Sheet Location

	As of March 31, 2012
Balance Sheet Caption	Derivatives Designated as Hedging Instruments (a)			Other Derivative Instruments (b)			Gross Derivative Instruments			Effects of Cash Collateral and Netting			Net Derivative Instruments
	(millions of dollars)
Derivative assets (current assets)	$	9		$	8		$	17		$	(11	)	$	6
Derivative assets (non-current assets)		—			1			1			—			1
Total Derivative assets		9			9			18			(11	)		7
Derivative liabilities (current  liabilities)		(38	)		(50	)		(88	)		63			(25	)
Derivative liabilities (non-current liabilities)		(8	)		(6	)		(14	)		12			(2	)
Total Derivative liabilities		(46	)		(56	)		(102	)		75			(27	)
Net Derivative (liability) asset	$	(37	)	$	(47	)	$	(84	)	$	64		$	(20	)

(a) Amounts included in Derivatives Designated as Hedging Instruments primarily consist of derivatives that were designated as cash flow hedges prior to Pepco Energy Services' election to discontinue cash flow hedge accounting for these derivatives.

(b) Amounts included in Other Derivative Instruments include gains or losses on gas derivatives that are not accounted for as cash flow hedges subsequent to Pepco Energy Services' election to discontinue cash flow hedge accounting.

	As of December 31, 2011
Balance Sheet Caption	Derivatives Designated as Hedging Instruments (a)			Other Derivative Instruments (b)			Gross Derivative Instruments			Effects of Cash Collateral and Netting			Net Derivative Instruments
	(millions of dollars)
Derivative assets (current assets)	$	17		$	6		$	23		$	(18	)	$	5
Derivative assets (non-current assets)		—			1			1			(1	)		—
Total Derivative assets		17			7			24			(19	)		5
Derivative liabilities (current liabilities)		(55	)		(48	)		(103	)		77			(26	)
Derivative liabilities (non-current liabilities)		(11	)		(10	)		(21	)		15			(6	)
Total Derivative liabilities		(66	)		(58	)		(124	)		92			(32	)
Net Derivative (liability) asset	$	(49	)	$	(51	)	$	(100	)	$	73		$	(27	)

(a) Amounts included in Derivatives Designated as Hedging Instruments primarily consist of derivatives that were designated as cash flow hedges prior to Pepco Energy Services' election to discontinue cash flow hedge accounting for these derivatives.

(b) Amounts included in Other Derivative Instruments include gains or losses on gas derivatives that are not accounted for as cash flow hedges subsequent to Pepco Energy Services' election to discontinue cash flow hedge accounting.

Schedule Of Cash Collateral Offset Against Derivative Positions

	March 31, 2012		December 31, 2011
	(millions of dollars)
Cash collateral pledged to counterparties with the right to reclaim (a)	$	64	$	73

(a) Includes cash deposits on commodity brokerage accounts

Activity Of Energy Commodity Contracts Designated As Cash Flow Hedges

	Three Months Ended March  31,
	2012		2011
	(millions of dollars)
Amount of net pre-tax loss arising during the period included in accumulated other comprehensive loss	$	—	$	(1	)
Amount of net pre-tax loss reclassified into income:
Effective portion:
Fuel and purchased energy		13		27
Ineffective portion: (a)
Revenue		—		—
Total net pre-tax loss reclassified into income		13		27
Net pre-tax gain on commodity derivatives included in accumulated other comprehensive loss	$	13	$	26

(a) For the three months ended March 31, 2012 and 2011, no amounts were reclassified from AOCL to income because it was deemed probable that the forecasted hedged transactions would not occur.

Outstanding Energy Commodity Contracts Employed As Cash Flow Hedges

	Quantities
Commodity	March 31, 2012		December 31, 2011
Forecasted Purchases Hedges
Natural gas (One Million British Thermal Units (MMBtu))		—		—
Electricity (Megawatt hours (MWh))		246,680		614,560
Electricity capacity (MW-Days)		—		—
Forecasted Sales Hedges
Electricity (MWh)		246,680		614,560

Cash Flow Hedges Included In Accumulated Other Comprehensive Loss

	As of March 31, 2012
Contracts	Accumulated Other Comprehensive Loss After-tax		Portion Expected to be Reclassified to Income during the Next 12 Months		Maximum Term
	(millions of dollars)
Energy commodity (a)	$	21	$	17		26 months
Interest rate		10		1		245 months
Total	$	31	$	18

(a) The unrealized derivative losses recorded in AOCL relate to forecasted physical natural gas and electricity purchases which are used to supply retail natural gas and electricity contracts that are in gain positions and subject to accrual accounting. Under accrual accounting, no asset is recorded on PHI's consolidated balance sheet and the purchase cost is not recognized until the period of distribution.

	As of March 31, 2011
Contracts	Accumulated Other Comprehensive Loss After-tax		Portion Expected to be Reclassified to Income during the Next 12 Months		Maximum Term
	(millions of dollars)
Energy commodity (a)	$	62	$	38		38 months
Interest rate		11		1		257 months
Total	$	73	$	39

(a) The unrealized derivative losses recorded in AOCL relate to forecasted physical natural gas and electricity purchases which are used to supply retail natural gas and electricity contracts that are in gain positions and subject to accrual accounting. Under accrual accounting, no asset is recorded on PHI's consolidated balance sheet and the purchase cost is not recognized until the period of distribution.

Pepco Energy Services [Member]

Outstanding Energy Commodity Contracts Employed As Cash Flow Hedges

	March 31, 2012				December 31, 2011
Commodity	Quantity		Net Position		Quantity		Net Position
Financial transmission rights (MWh)		79,607		Long		267,480		Long
Electric capacity (MW–Days)		5,185		Long		12,920		Long
Electric (MWh)		657,240		Long		788,280		Long
Natural gas (MMBtu)		15,037,300		Long		24,550,257		Long

Schedule Of Derivative Gain (Loss) Amounts Recognized In Income

	Three Months Ended March 31,
	2012			2011
	(millions of dollars)
Reclassification to realized on settlement of contracts	$	10		$	(4	)
Unrealized mark-to-market loss		(10	)		—
Total net loss	$	—		$	(4	)

Delmarva Power & Light Co/De [Member]

Net Unrealized Derivative Gain (Loss) Deferred As A Regulatory Asset Or Liability

	Three Months Ended March  31,
	2012		2011
	(millions of dollars)
Net unrealized (loss) gain arising during the period included in Regulatory assets	$	—	$	—
Net realized loss recognized in Fuel and purchased energy expense		—		(2	)

Schedule Of Unrealized Derivative Losses Included In Regulatory Assets And Realized Losses Recognized In Statement Of Financial Performance

	Three Months Ended March  31,
	2012			2011
Net unrealized gain (loss) arising during the period included in Regulatory assets	$	(4	)	$	(1	)
Net realized loss recognized in Fuel and purchased energy expense		(7	)		(7	)

Net Outstanding Commodity Forward Contracts That Did Not Qualify For Hedge Accounting

	March 31, 2012				December 31, 2011
Commodity	Quantity		Net Position		Quantity		Net Position
Natural gas (MMBtu)		4,109,100		Long		6,161,200		Long