Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2012		Dec. 31, 2011
Current Assets
Cash and Cash Equivalents	$ 286,000,000		$ 221,000,000
Other Temporary Investments	217,000,000		294,000,000
Accounts Receivable:
Customers	616,000,000		690,000,000
Accrued Unbilled Revenues	78,000,000		106,000,000
Pledged Accounts Receivable - AEP Credit	896,000,000		920,000,000
Miscellaneous	114,000,000		150,000,000
Allowance for Uncollectible Accounts	(34,000,000)		(32,000,000)
Total Accounts Receivable	1,670,000,000		1,834,000,000
Fuel	780,000,000		657,000,000
Materials and Supplies	638,000,000		635,000,000
Risk Management Assets	246,000,000		193,000,000
Accrued Tax Benefits	47,000,000		51,000,000
Regulatory Asset for Under-Recovered Fuel Costs	75,000,000		65,000,000
Margin Deposits	70,000,000		67,000,000
Prepayments and Other Current Assets	185,000,000		165,000,000
TOTAL CURRENT ASSETS	4,214,000,000		4,182,000,000
Property, Plant and Equipment
Generation	25,309,000,000		24,938,000,000
Transmission	9,211,000,000		9,048,000,000
Distribution	14,944,000,000		14,783,000,000
Other Property, Plant and Equipment	3,836,000,000		3,780,000,000
Construction Work in Progress	2,923,000,000		3,121,000,000
Total Property, Plant and Equipment	56,223,000,000		55,670,000,000
Accumulated Depreciation and Amortization	18,791,000,000		18,699,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	37,432,000,000		36,971,000,000
Other Noncurrent Assets
Regulatory Assets	5,291,000,000		6,026,000,000
Securitized Transition Assets	2,289,000,000		1,627,000,000
Spent Nuclear Fuel and Decommissioning Trusts	1,662,000,000		1,592,000,000
Goodwill	90,000,000		76,000,000
Long-term Risk Management Assets	425,000,000		403,000,000
Deferred Charges and Other Noncurrent Assets	1,499,000,000		1,346,000,000
TOTAL OTHER NONCURRENT ASSETS	11,256,000,000		11,070,000,000
TOTAL ASSETS	52,902,000,000		52,223,000,000
Current Liabilities
Accounts Payable	978,000,000		1,095,000,000
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	665,000,000	[1]	666,000,000	[1]
Other Short-term Debt	385,000,000		984,000,000
Total Short-term Debt	1,050,000,000		1,650,000,000
Long-term Debt Due Within One Year	1,980,000,000		1,433,000,000
Risk Management Liabilities	185,000,000		150,000,000
Customer Deposits	301,000,000		289,000,000
Accrued Taxes	679,000,000		717,000,000
Accrued Interest	237,000,000		279,000,000
Regulatory Liability for Over-Recovered Fuel Costs	79,000,000		8,000,000
Other Current Liabilities	853,000,000		990,000,000
TOTAL CURRENT LIABILITIES	6,342,000,000		6,611,000,000
Noncurrent Liabilities
Long-term Debt	15,340,000,000		15,083,000,000
Long-term Risk Management Liabilities	239,000,000		195,000,000
Deferred Income Taxes	8,493,000,000		8,227,000,000
Regulatory Liabilities and Deferred Investment Tax Credits	3,469,000,000		3,195,000,000
Asset Retirement Obligations	1,500,000,000		1,472,000,000
Employee Benefits and Pension Obligations	1,739,000,000		1,801,000,000
Deferred Credits and Other Noncurrent Liabilities	923,000,000		974,000,000
TOTAL NONCURRENT LIABILITIES	31,703,000,000		30,947,000,000
TOTAL LIABILITIES	38,045,000,000		37,558,000,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	3,280,000,000		3,274,000,000
Paid-in Capital	5,998,000,000		5,970,000,000
Retained Earnings	6,050,000,000		5,890,000,000
Accumulated Other Comprehensive Income (Loss)	(472,000,000)		(470,000,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	14,856,000,000		14,664,000,000
Noncontrolling Interests	1,000,000		1,000,000
TOTAL EQUITY	14,857,000,000		14,665,000,000
TOTAL LIABILITIES AND EQUITY	52,902,000,000		52,223,000,000
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,803,000		2,317,000
Advances to Affiliates	22,406,000		22,008,000
Accounts Receivable:
Customers	147,909,000		158,382,000
Affiliated Companies	71,831,000		136,194,000
Accrued Unbilled Revenues	45,808,000		68,427,000
Miscellaneous	2,654,000		5,505,000
Allowance for Uncollectible Accounts	(5,568,000)		(5,289,000)
Total Accounts Receivable	262,634,000		363,219,000
Fuel	188,148,000		143,931,000
Materials and Supplies	102,644,000		101,724,000
Risk Management Assets	49,520,000		39,645,000
Accrued Tax Benefits	2,025,000		7,715,000
Regulatory Asset for Under-Recovered Fuel Costs	43,773,000		41,105,000
Prepayments and Other Current Assets	21,707,000		21,745,000
TOTAL CURRENT ASSETS	694,660,000		743,409,000
Property, Plant and Equipment
Generation	5,547,165,000		5,194,967,000
Transmission	2,002,348,000		1,943,969,000
Distribution	2,868,847,000		2,845,405,000
Other Property, Plant and Equipment	368,030,000		357,326,000
Construction Work in Progress	193,637,000		565,841,000
Total Property, Plant and Equipment	10,980,027,000		10,907,508,000
Accumulated Depreciation and Amortization	3,048,168,000		2,994,016,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	7,931,859,000		7,913,492,000
Other Noncurrent Assets
Regulatory Assets	1,458,032,000		1,481,193,000
Long-term Risk Management Assets	46,049,000		39,226,000
Deferred Charges and Other Noncurrent Assets	124,349,000		122,187,000
TOTAL OTHER NONCURRENT ASSETS	1,628,430,000		1,642,606,000
TOTAL ASSETS	10,254,949,000		10,299,507,000
Current Liabilities
Advances from Affiliates	184,040,000		198,248,000
Accounts Payable	173,411,000		186,612,000
Affiliated Companies	92,497,000		137,376,000
Short-term Debt:
Long-term Debt Due Within One Year	545,026,000		594,525,000
Risk Management Liabilities	33,047,000		26,606,000
Customer Deposits	62,044,000		61,690,000
Deferred Income Taxes	20,757,000		14,255,000
Accrued Taxes	79,294,000		63,422,000
Accrued Interest	60,611,000		57,230,000
Other Current Liabilities	81,997,000		105,646,000
TOTAL CURRENT LIABILITIES	1,332,724,000		1,445,610,000
Noncurrent Liabilities
Long-term Debt	3,131,908,000		3,131,726,000
Long-term Risk Management Liabilities	21,971,000		12,923,000
Deferred Income Taxes	1,759,245,000		1,736,180,000
Regulatory Liabilities and Deferred Investment Tax Credits	590,453,000		576,792,000
Employee Benefits and Pension Obligations	298,177,000		302,182,000
Deferred Credits and Other Noncurrent Liabilities	158,385,000		157,680,000
TOTAL NONCURRENT LIABILITIES	5,960,139,000		5,917,483,000
TOTAL LIABILITIES	7,292,863,000		7,363,093,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	260,458,000		260,458,000
Paid-in Capital	1,573,752,000		1,573,752,000
Retained Earnings	1,186,058,000		1,160,747,000
Accumulated Other Comprehensive Income (Loss)	(58,182,000)		(58,543,000)
TOTAL EQUITY	2,962,086,000		2,936,414,000
TOTAL LIABILITIES AND EQUITY	10,254,949,000		10,299,507,000
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents	643,000		1,020,000
Advances to Affiliates	143,962,000		95,714,000
Accounts Receivable:
Customers	60,784,000		72,461,000
Affiliated Companies	57,309,000		90,980,000
Accrued Unbilled Revenues	15,570,000		14,780,000
Miscellaneous	37,302,000		22,685,000
Allowance for Uncollectible Accounts	(1,948,000)		(1,750,000)
Total Accounts Receivable	169,017,000		199,156,000
Fuel	71,800,000		52,979,000
Materials and Supplies	170,993,000		175,924,000
Risk Management Assets	45,019,000		32,152,000
Accrued Tax Benefits	21,318,000		38,425,000
Deferred Cook Plant Fire Costs	64,291,000		63,809,000
Prepayments and Other Current Assets	45,137,000		35,395,000
TOTAL CURRENT ASSETS	732,180,000		694,574,000
Property, Plant and Equipment
Generation	3,922,767,000		3,932,472,000
Transmission	1,233,154,000		1,224,786,000
Distribution	1,494,192,000		1,481,608,000
Other Property, Plant and Equipment	693,440,000		709,558,000
Construction Work in Progress	253,831,000		236,096,000
Total Property, Plant and Equipment	7,597,384,000		7,584,520,000
Accumulated Depreciation and Amortization	3,201,638,000		3,179,920,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	4,395,746,000		4,404,600,000
Other Noncurrent Assets
Regulatory Assets	600,515,000		602,979,000
Spent Nuclear Fuel and Decommissioning Trusts	1,661,580,000		1,591,732,000
Long-term Risk Management Assets	34,563,000		29,362,000
Deferred Charges and Other Noncurrent Assets	75,171,000		69,309,000
TOTAL OTHER NONCURRENT ASSETS	2,371,829,000		2,293,382,000
TOTAL ASSETS	7,499,755,000		7,392,556,000
Current Liabilities
Accounts Payable	108,485,000		113,063,000
Affiliated Companies	64,902,000		81,102,000
Short-term Debt:
Long-term Debt Due Within One Year	277,284,000		279,075,000
Risk Management Liabilities	29,265,000		16,980,000
Customer Deposits	30,715,000		30,696,000
Accrued Taxes	78,911,000		65,233,000
Accrued Interest	22,578,000		27,798,000
Other Current Liabilities	102,405,000		117,879,000
TOTAL CURRENT LIABILITIES	714,545,000		731,826,000
Noncurrent Liabilities
Long-term Debt	1,764,457,000		1,778,600,000
Long-term Risk Management Liabilities	15,455,000		18,871,000
Deferred Income Taxes	952,319,000		925,712,000
Regulatory Liabilities and Deferred Investment Tax Credits	946,896,000		875,202,000
Asset Retirement Obligations	1,026,191,000		1,013,122,000
Deferred Credits and Other Noncurrent Liabilities	289,456,000		288,243,000
TOTAL NONCURRENT LIABILITIES	4,994,774,000		4,899,750,000
TOTAL LIABILITIES	5,709,319,000		5,631,576,000
Rate Matters	0		0
Commitments and Contingencies	0		0
Equity
Common Stock	56,584,000		56,584,000
Paid-in Capital	980,896,000		980,896,000
Retained Earnings	778,442,000		751,721,000
Accumulated Other Comprehensive Income (Loss)	(25,486,000)		(28,221,000)
TOTAL EQUITY	1,790,436,000		1,760,980,000
TOTAL LIABILITIES AND EQUITY	7,499,755,000		7,392,556,000
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,709,000		2,095,000
Advances to Affiliates	89,840,000		219,458,000
Accounts Receivable:
Customers	87,635,000		146,432,000
Affiliated Companies	146,616,000		162,830,000
Accrued Unbilled Revenues	3,095,000		19,012,000
Miscellaneous	12,811,000		16,994,000
Allowance for Uncollectible Accounts	(3,526,000)		(3,563,000)
Total Accounts Receivable	246,631,000		341,705,000
Fuel	311,773,000		262,886,000
Materials and Supplies	193,333,000		201,325,000
Risk Management Assets	73,775,000		54,293,000
Accrued Tax Benefits	6,095,000		11,975,000
Prepayments and Other Current Assets	42,862,000		41,560,000
TOTAL CURRENT ASSETS	966,018,000		1,135,297,000
Property, Plant and Equipment
Generation	9,528,532,000		9,502,614,000
Transmission	1,958,930,000		1,948,329,000
Distribution	3,582,480,000		3,545,574,000
Other Property, Plant and Equipment	556,737,000		546,642,000
Construction Work in Progress	364,474,000		354,465,000
Total Property, Plant and Equipment	15,991,153,000		15,897,624,000
Accumulated Depreciation and Amortization	5,692,825,000		5,742,561,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	10,298,328,000		10,155,063,000
Other Noncurrent Assets
Regulatory Assets	1,356,371,000		1,370,504,000
Long-term Risk Management Assets	68,264,000		53,614,000
Deferred Charges and Other Noncurrent Assets	250,748,000		309,775,000
TOTAL OTHER NONCURRENT ASSETS	1,675,383,000		1,733,893,000
TOTAL ASSETS	12,939,729,000		13,024,253,000
Current Liabilities
Accounts Payable	229,329,000		293,730,000
Affiliated Companies	115,182,000		183,898,000
Short-term Debt:
Long-term Debt Due Within One Year	594,500,000		244,500,000
Risk Management Liabilities	49,460,000		36,561,000
Accrued Taxes	365,340,000		450,570,000
Accrued Interest	68,100,000		66,441,000
Other Current Liabilities	246,062,000		238,275,000
TOTAL CURRENT LIABILITIES	1,667,973,000		1,513,975,000
Noncurrent Liabilities
Long-term Debt	3,109,846,000		3,609,648,000
Long-term Debt - Affiliated	200,000,000		200,000,000
Long-term Risk Management Liabilities	32,662,000		17,890,000
Deferred Income Taxes	2,286,013,000		2,245,380,000
Regulatory Liabilities and Deferred Investment Tax Credits	467,993,000		301,124,000
Employee Benefits and Pension Obligations	321,980,000		335,029,000
Deferred Credits and Other Noncurrent Liabilities	325,754,000		351,029,000
TOTAL NONCURRENT LIABILITIES	6,744,248,000		7,060,100,000
TOTAL LIABILITIES	8,412,221,000		8,574,075,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	321,201,000		321,201,000
Paid-in Capital	1,744,099,000		1,744,099,000
Retained Earnings	2,658,430,000		2,582,600,000
Accumulated Other Comprehensive Income (Loss)	(196,222,000)		(197,722,000)
TOTAL EQUITY	4,527,508,000		4,450,178,000
TOTAL LIABILITIES AND EQUITY	12,939,729,000		13,024,253,000
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents	788,000		1,413,000
Advances to Affiliates	29,136,000		39,876,000
Accounts Receivable:
Customers	35,939,000		39,977,000
Affiliated Companies	44,613,000		23,079,000
Miscellaneous	7,342,000		8,993,000
Allowance for Uncollectible Accounts	(771,000)		(777,000)
Total Accounts Receivable	87,123,000		71,272,000
Fuel	19,661,000		20,854,000
Materials and Supplies	50,429,000		50,347,000
Risk Management Assets	860,000		565,000
Deferred Income Tax Benefits	10,528,000		7,013,000
Accrued Tax Benefits	9,116,000		6,733,000
Regulatory Asset for Under-Recovered Fuel Costs	0		4,313,000
Prepayments and Other Current Assets	6,777,000		6,440,000
TOTAL CURRENT ASSETS	214,418,000		208,826,000
Property, Plant and Equipment
Generation	1,316,411,000		1,317,948,000
Transmission	696,741,000		692,644,000
Distribution	1,786,250,000		1,762,110,000
Other Property, Plant and Equipment	217,335,000		214,626,000
Construction Work in Progress	66,030,000		70,371,000
Total Property, Plant and Equipment	4,082,767,000		4,057,699,000
Accumulated Depreciation and Amortization	1,265,681,000		1,266,816,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	2,817,086,000		2,790,883,000
Other Noncurrent Assets
Regulatory Assets	264,738,000		266,545,000
Long-term Risk Management Assets	255,000		314,000
Deferred Charges and Other Noncurrent Assets	42,229,000		13,536,000
TOTAL OTHER NONCURRENT ASSETS	307,222,000		280,395,000
TOTAL ASSETS	3,338,726,000		3,280,104,000
Current Liabilities
Accounts Payable	53,661,000		76,607,000
Affiliated Companies	39,071,000		45,029,000
Short-term Debt:
Long-term Debt Due Within One Year	429,000		311,000
Risk Management Liabilities	4,059,000		1,280,000
Customer Deposits	46,737,000		47,493,000
Accrued Taxes	40,255,000		21,660,000
Accrued Interest	14,970,000		12,637,000
Regulatory Liability for Over-Recovered Fuel Costs	57,762,000		0
Other Current Liabilities	37,043,000		43,586,000
TOTAL CURRENT LIABILITIES	293,987,000		248,603,000
Noncurrent Liabilities
Long-term Debt	948,964,000		947,053,000
Long-term Risk Management Liabilities	3,410,000		1,330,000
Deferred Income Taxes	736,567,000		726,463,000
Regulatory Liabilities and Deferred Investment Tax Credits	340,564,000		334,812,000
Employee Benefits and Pension Obligations	82,990,000		84,548,000
Deferred Credits and Other Noncurrent Liabilities	41,844,000		44,490,000
TOTAL NONCURRENT LIABILITIES	2,154,339,000		2,138,696,000
TOTAL LIABILITIES	2,448,326,000		2,387,299,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	157,230,000		157,230,000
Paid-in Capital	364,037,000		364,037,000
Retained Earnings	362,037,000		364,389,000
Accumulated Other Comprehensive Income (Loss)	7,096,000		7,149,000
TOTAL EQUITY	890,400,000		892,805,000
TOTAL LIABILITIES AND EQUITY	3,338,726,000		3,280,104,000
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents	18,032,000		801,000
Advances to Affiliates	27,651,000		0
Accounts Receivable:
Customers	33,442,000		35,054,000
Affiliated Companies	23,569,000		23,730,000
Miscellaneous	15,439,000		19,370,000
Allowance for Uncollectible Accounts	(991,000)		(989,000)
Total Accounts Receivable	71,459,000		77,165,000
Fuel	93,461,000		102,015,000
Materials and Supplies	64,062,000		55,325,000
Risk Management Assets	1,197,000		445,000
Deferred Income Tax Benefits	4,745,000		8,195,000
Accrued Tax Benefits	56,523,000		1,541,000
Regulatory Asset for Under-Recovered Fuel Costs	18,676,000		10,843,000
Prepayments and Other Current Assets	25,321,000		16,827,000
TOTAL CURRENT ASSETS	381,127,000		273,157,000
Property, Plant and Equipment
Generation	2,326,828,000		2,326,102,000
Transmission	1,020,686,000		988,534,000
Distribution	1,695,881,000		1,675,764,000
Other Property, Plant and Equipment	650,122,000		637,019,000
Construction Work in Progress	1,499,757,000		1,443,569,000
Total Property, Plant and Equipment	7,193,274,000		7,070,988,000
Accumulated Depreciation and Amortization	2,230,300,000		2,211,912,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	4,962,974,000		4,859,076,000
Other Noncurrent Assets
Regulatory Assets	415,221,000		394,276,000
Long-term Risk Management Assets	423,000		282,000
Deferred Charges and Other Noncurrent Assets	108,070,000		74,992,000
TOTAL OTHER NONCURRENT ASSETS	523,714,000		469,550,000
TOTAL ASSETS	5,867,815,000		5,601,783,000
Current Liabilities
Advances from Affiliates	0		132,473,000
Accounts Payable	149,441,000		181,268,000
Affiliated Companies	69,234,000		59,201,000
Short-term Debt:
Other Short-term Debt	0		17,016,000
Long-term Debt Due Within One Year	3,250,000		20,000,000
Risk Management Liabilities	10,733,000		24,359,000
Customer Deposits	63,501,000		52,095,000
Accrued Taxes	57,079,000		44,404,000
Accrued Interest	18,854,000		39,629,000
Obligations Under Capital Leases	16,200,000		15,058,000
Regulatory Liability for Over-Recovered Fuel Costs	0		5,032,000
Other Current Liabilities	67,385,000		64,413,000
TOTAL CURRENT LIABILITIES	455,677,000		654,948,000
Noncurrent Liabilities
Long-term Debt	2,044,337,000		1,708,637,000
Long-term Risk Management Liabilities	309,000		221,000
Deferred Income Taxes	759,358,000		665,668,000
Regulatory Liabilities and Deferred Investment Tax Credits	438,882,000		428,571,000
Asset Retirement Obligations	74,647,000		65,673,000
Employee Benefits and Pension Obligations	92,794,000		87,159,000
Obligations Under Capital Leases	116,184,000		112,802,000
Deferred Credits and Other Noncurrent Liabilities	38,177,000		64,347,000
TOTAL NONCURRENT LIABILITIES	3,564,688,000		3,133,078,000
TOTAL LIABILITIES	4,020,365,000		3,788,026,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	135,660,000		135,660,000
Paid-in Capital	674,606,000		674,606,000
Retained Earnings	1,065,227,000		1,029,915,000
Accumulated Other Comprehensive Income (Loss)	(28,425,000)		(26,815,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	1,847,068,000		1,813,366,000
Noncontrolling Interests	382,000		391,000
TOTAL EQUITY	1,847,450,000		1,813,757,000
TOTAL LIABILITIES AND EQUITY	$ 5,867,815,000		$ 5,601,783,000

[1] Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance.