Effects of Regulation (Tables)

12 Months Ended

Dec. 31, 2011

Effects of Regulation (Tables) [Abstract]

Regulatory Assets

			December 31,				Remaining
			2011		2010		Recovery Period
Current Regulatory Assets			(in millions)
Under-recovered Fuel Costs - earns a return			$	56	$	73	1 year
Under-recovered Fuel Costs - does not earn a return				9		8	1 year
Total Current Regulatory Assets			$	65	$	81
Noncurrent Regulatory Assets
Regulatory assets not yet being recovered pending future
	proceedings to determine the recovery method and timing:
	Regulatory Assets Currently Earning a Return
		Storm Related Costs	$	24	$	55
		Economic Development Rider		13		6
		Customer Choice Deferrals		-		59
		Line Extension Carrying Costs		-		55
		Acquisition of Monongahela Power		-		8
		Other Regulatory Assets Not Yet Being Recovered		-		1
	Regulatory Assets Currently Not Earning a Return
		Deferred Wind Power Costs		38		29
		Environmental Rate Adjustment Clause		18		56
		Mountaineer Carbon Capture and Storage Product Validation Facility		14		60
		Special Rate Mechanism for Century Aluminum		13		13
		Litigation Settlement		11		-
		Storm Related Costs		10		45
		Acquisition of Monongahela Power		-		4
		Other Regulatory Assets Not Yet Being Recovered		14		4
Total Regulatory Assets Not Yet Being Recovered				155		395
Regulatory assets being recovered:
	Regulatory Assets Currently Earning a Return
		Capacity Auction True-Up		692		-	13 years
		Fuel Adjustment Clause		521		476	7 years
		Expanded Net Energy Charge		327		361	2 years
		Distribution Asset Recovery Rider		173		-	7 years
		Unamortized Loss on Reacquired Debt		92		93	32 years
		Storm Related Costs		65		38	7 years
		Meter Replacement Costs		39		4	29 years
		Transmission Cost Recovery Rider		28		-	2 years
		RTO Formation/Integration Costs		18		21	8 years
		Economic Development Rider		12		1	1 year
		Red Rock Generating Facility		10		10	45 years
		Other Regulatory Assets Being Recovered		15		17	various
	Regulatory Assets Currently Not Earning a Return
		Pension and OPEB Funded Status		2,308		2,161	13 years
		Income Taxes, Net		1,237		1,097	37 years
		Postemployment Benefits		47		51	4 years
		Cook Nuclear Plant Refueling Outage Levelization		41		54	2 years
		Storm Related Costs		35		21	7 years
		Expanded Net Energy Charge		32		-	6 years
		Environmental Rate Adjustment Clause		24		-	2 years
		Deferred PJM Fees		22		7	1 year
		Transmission Rate Adjustment Clause		20		19	2 years
		Deferred Restructuring Costs		18		6	7 years
		Unrealized Loss on Forward Commitments		16		10	2 years
		Asset Retirement Obligation		14		15	9 years
		Vegetation Management		11		13	1 year
		Restructuring Transition Costs		8		14	5 years
		Off-system Sales Margin Sharing		-		13
		Other Regulatory Assets Being Recovered		46		46	various
Total Regulatory Assets Being Recovered				5,871		4,548
Total Noncurrent Regulatory Assets			$	6,026	$	4,943

Regulatory Liabilities

				December 31,				Remaining
				2011		2010		Refund Period
Current Regulatory Liabilities				(in millions)
Over-recovered Fuel Costs - pays a return				$	5	$	16	1 year
Over-recovered Fuel Costs - does not pay a return					3		1	1 year
Total Current Regulatory Liabilities				$	8	$	17
Noncurrent Regulatory Liabilities and
Deferred Investment Tax Credits
Regulatory liabilities not yet being paid:
	Regulatory Liabilities Currently Paying a Return
		Refundable Construction Financing Costs		$	53	$	20
		Other Regulatory Liabilities Not Yet Being Paid			5		-
	Regulatory Liabilities Currently Not Paying a Return
		Over-recovery of Costs Related to gridSMART®			4		10
		Other Regulatory Liabilities Not Yet Being Paid			4		11
Total Regulatory Liabilities Not Yet Being Paid					66		41
Regulatory liabilities being paid:
	Regulatory Liabilities Currently Paying a Return
		Asset Removal Costs			2,270		2,222	(a)
		Advanced Metering Infrastructure Surcharge			78		61	9 years
		Deferred Investment Tax Credits			27		32	11 years
		Excess Earnings			13		13	42 years
		Other Regulatory Liabilities Being Paid			4		4	various
	Regulatory Liabilities Currently Not Paying a Return
		Excess Asset Retirement Obligations for Nuclear Decommissioning
			Liability		377		354	(b)
		Deferred Investment Tax Credits			144		242	75 years
		Spent Nuclear Fuel Liability			43		42	(b)
		Unrealized Gain on Forward Commitments			41		60	5 years
		Over-recovery of Transition Charges			41		38	10 years
		Energy Efficiency/Peak Demand Reduction			40		10	1 year
		Deferred State Income Tax Coal Credits			29		29	10 years
		Over-recovery of PJM Expenses			-		12
		Other Regulatory Liabilities Being Paid			22		11	various
Total Regulatory Liabilities Being Paid					3,129		3,130
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax
	Credits			$	3,195	$	3,171
(a)			Relieved as removal costs are incurred.
(b)			Relieved when plant is decommissioned.