Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2013		Dec. 31, 2012
Current Assets
Cash and Cash Equivalents	$ 179,000,000		$ 279,000,000
Other Temporary Investments	261,000,000		324,000,000
Accounts Receivable:
Customers	679,000,000		685,000,000
Accrued Unbilled Revenues	210,000,000		195,000,000
Pledged Accounts Receivable - AEP Credit	884,000,000		856,000,000
Miscellaneous	133,000,000		171,000,000
Allowance for Uncollectible Accounts	(37,000,000)		(36,000,000)
Total Accounts Receivable	1,869,000,000		1,871,000,000
Fuel	839,000,000		844,000,000
Materials and Supplies	681,000,000		675,000,000
Risk Management Assets	162,000,000		191,000,000
Regulatory Asset for Under-Recovered Fuel Costs	91,000,000		88,000,000
Margin Deposits	74,000,000		76,000,000
Prepayments and Other Current Assets	241,000,000		241,000,000
TOTAL CURRENT ASSETS	4,397,000,000		4,589,000,000
Property, Plant and Equipment
Generation	26,389,000,000		26,279,000,000
Transmission	9,902,000,000		9,846,000,000
Distribution	15,720,000,000		15,565,000,000
Other Property, Plant and Equipment	3,986,000,000		3,945,000,000
Construction Work in Progress	2,078,000,000		1,819,000,000
Total Property, Plant and Equipment	58,075,000,000		57,454,000,000
Accumulated Depreciation and Amortization	18,945,000,000		18,691,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	39,130,000,000		38,763,000,000
Other Noncurrent Assets
Regulatory Assets	5,087,000,000		5,106,000,000
Securitized Transition Assets	2,065,000,000		2,117,000,000
Spent Nuclear Fuel and Decommissioning Trusts	1,788,000,000		1,706,000,000
Goodwill	91,000,000		91,000,000
Long-term Risk Management Assets	341,000,000		368,000,000
Deferred Charges and Other Noncurrent Assets	1,651,000,000		1,627,000,000
TOTAL OTHER NONCURRENT ASSETS	11,023,000,000		11,015,000,000
TOTAL ASSETS	54,550,000,000		54,367,000,000
Current Liabilities
Accounts Payable	1,004,000,000		1,169,000,000
Short-term Debt:
Securitized Debt for Receivable - AEP Credit	646,000,000	[1]	657,000,000	[1]
Other Short-term Debt	661,000,000		324,000,000
Total Short-term Debt	1,307,000,000		981,000,000
Long-term Debt Due Within One Year	1,674,000,000		2,171,000,000
Risk Management Liabilities	94,000,000		155,000,000
Customer Deposits	299,000,000		316,000,000
Accrued Taxes	727,000,000		747,000,000
Accrued Interest	241,000,000		269,000,000
Regulatory Liability for Over-Recovered Fuel Costs	18,000,000		47,000,000
Other Current Liabilities	811,000,000		968,000,000
TOTAL CURRENT LIABILITIES	6,175,000,000		6,823,000,000
Noncurrent Liabilities
Long-term Debt	15,899,000,000		15,586,000,000
Long-term Risk Management Liabilities	185,000,000		214,000,000
Deferred Income Taxes	9,556,000,000		9,252,000,000
Regulatory Liabilities and Deferred Investment Tax Credits	3,625,000,000		3,544,000,000
Asset Retirement Obligations	1,727,000,000		1,696,000,000
Employee Benefits and Pension Obligations	1,049,000,000		1,075,000,000
Deferred Credits and Other Noncurrent Liabilities	913,000,000		940,000,000
TOTAL NONCURRENT LIABILITIES	32,954,000,000		32,307,000,000
TOTAL LIABILITIES	39,129,000,000		39,130,000,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	3,291,000,000		3,289,000,000
Paid-in Capital	6,066,000,000		6,049,000,000
Retained Earnings	6,370,000,000		6,236,000,000
Accumulated Other Comprehensive Income (Loss)	(306,000,000)		(337,000,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	15,421,000,000		15,237,000,000
Noncontrolling Interests	0		0
TOTAL EQUITY	15,421,000,000		15,237,000,000
TOTAL LIABILITIES AND EQUITY	54,550,000,000		54,367,000,000
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,256,000		3,576,000
Advances to Affiliates	23,203,000		23,024,000
Accounts Receivable:
Customers	166,609,000		158,380,000
Affiliated Companies	68,145,000		96,213,000
Accrued Unbilled Revenues	80,762,000		70,825,000
Miscellaneous	1,236,000		1,344,000
Allowance for Uncollectible Accounts	(3,315,000)		(6,087,000)
Total Accounts Receivable	313,437,000		320,675,000
Fuel	192,283,000		185,813,000
Materials and Supplies	107,464,000		105,208,000
Risk Management Assets	23,127,000		30,960,000
Accrued Tax Benefits	27,560,000		50,032,000
Regulatory Asset for Under-Recovered Fuel Costs	67,703,000		74,906,000
Prepayments and Other Current Assets	17,089,000		18,690,000
TOTAL CURRENT ASSETS	773,122,000		812,884,000
Property, Plant and Equipment
Generation	5,644,518,000		5,632,665,000
Transmission	2,048,965,000		2,042,144,000
Distribution	3,030,491,000		2,991,898,000
Other Property, Plant and Equipment	377,305,000		373,327,000
Construction Work in Progress	271,320,000		266,247,000
Total Property, Plant and Equipment	11,372,599,000		11,306,281,000
Accumulated Depreciation and Amortization	3,246,522,000		3,196,639,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	8,126,077,000		8,109,642,000
Other Noncurrent Assets
Regulatory Assets	1,372,601,000		1,435,704,000
Long-term Risk Management Assets	24,016,000		34,360,000
Deferred Charges and Other Noncurrent Assets	120,929,000		115,078,000
TOTAL OTHER NONCURRENT ASSETS	1,517,546,000		1,585,142,000
TOTAL ASSETS	10,416,745,000		10,507,668,000
Current Liabilities
Advances from Affiliates	96,651,000		173,965,000
Accounts Payable	164,028,000		195,203,000
Affiliated Companies	123,971,000		137,088,000
Short-term Debt:
Long-term Debt Due Within One Year	574,679,000		574,679,000
Risk Management Liabilities	12,048,000		16,698,000
Customer Deposits	66,245,000		67,339,000
Deferred Income Taxes	13,611,000		11,715,000
Accrued Taxes	82,692,000		74,967,000
Accrued Interest	66,901,000		51,442,000
Other Current Liabilities	84,164,000		110,657,000
TOTAL CURRENT LIABILITIES	1,284,990,000		1,413,753,000
Noncurrent Liabilities
Long-term Debt	3,127,920,000		3,127,763,000
Long-term Risk Management Liabilities	12,764,000		18,476,000
Deferred Income Taxes	1,943,095,000		1,928,683,000
Regulatory Liabilities and Deferred Investment Tax Credits	614,587,000		607,680,000
Employee Benefits and Pension Obligations	203,744,000		204,207,000
Deferred Credits and Other Noncurrent Liabilities	154,919,000		154,544,000
TOTAL NONCURRENT LIABILITIES	6,057,029,000		6,041,353,000
TOTAL LIABILITIES	7,342,019,000		7,455,106,000
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	1,268,798,000		1,248,250,000
Accumulated Other Comprehensive Income (Loss)	(28,282,000)		(29,898,000)
TOTAL EQUITY	3,074,726,000		3,052,562,000
TOTAL LIABILITIES AND EQUITY	10,416,745,000		10,507,668,000
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents	572,000		1,562,000
Advances to Affiliates	321,985,000		116,977,000
Accounts Receivable:
Customers	61,032,000		61,776,000
Affiliated Companies	56,574,000		79,886,000
Accrued Unbilled Revenues	20,223,000		11,218,000
Miscellaneous	4,757,000		12,260,000
Allowance for Uncollectible Accounts	(206,000)		(229,000)
Total Accounts Receivable	142,380,000		164,911,000
Fuel	61,935,000		53,406,000
Materials and Supplies	193,486,000		195,147,000
Risk Management Assets	18,086,000		26,974,000
Accrued Tax Benefits	18,676,000		20,547,000
Deferred Cook Plant Fire Costs	0		80,000,000
Prepayments and Other Current Assets	62,064,000		62,723,000
TOTAL CURRENT ASSETS	819,184,000		722,247,000
Property, Plant and Equipment
Generation	4,072,402,000		4,062,733,000
Transmission	1,283,763,000		1,278,236,000
Distribution	1,569,475,000		1,553,358,000
Other Property, Plant and Equipment	715,495,000		725,313,000
Construction Work in Progress	375,413,000		341,063,000
Total Property, Plant and Equipment	8,016,548,000		7,960,703,000
Accumulated Depreciation and Amortization	3,244,675,000		3,232,135,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	4,771,873,000		4,728,568,000
Other Noncurrent Assets
Regulatory Assets	546,013,000		540,019,000
Spent Nuclear Fuel and Decommissioning Trusts	1,787,529,000		1,705,772,000
Long-term Risk Management Assets	16,595,000		23,569,000
Deferred Charges and Other Noncurrent Assets	117,899,000		111,364,000
TOTAL OTHER NONCURRENT ASSETS	2,468,036,000		2,380,724,000
TOTAL ASSETS	8,059,093,000		7,831,539,000
Current Liabilities
Accounts Payable	126,312,000		208,701,000
Affiliated Companies	52,078,000		104,631,000
Short-term Debt:
Long-term Debt Due Within One Year	197,066,000		203,953,000
Risk Management Liabilities	8,691,000		31,517,000
Customer Deposits	30,923,000		31,142,000
Accrued Taxes	80,002,000		67,675,000
Accrued Interest	20,175,000		26,859,000
Other Current Liabilities	113,770,000		122,053,000
TOTAL CURRENT LIABILITIES	629,017,000		796,531,000
Noncurrent Liabilities
Long-term Debt	2,085,514,000		1,853,713,000
Long-term Risk Management Liabilities	9,497,000		13,898,000
Deferred Income Taxes	1,056,567,000		1,019,160,000
Regulatory Liabilities and Deferred Investment Tax Credits	1,023,242,000		948,292,000
Asset Retirement Obligations	1,212,754,000		1,192,313,000
Deferred Credits and Other Noncurrent Liabilities	204,471,000		203,857,000
TOTAL NONCURRENT LIABILITIES	5,592,045,000		5,231,233,000
TOTAL LIABILITIES	6,221,062,000		6,027,764,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	56,584,000		56,584,000
Paid-in Capital	980,896,000		980,896,000
Retained Earnings	826,135,000		795,178,000
Accumulated Other Comprehensive Income (Loss)	(25,584,000)		(28,883,000)
TOTAL EQUITY	1,838,031,000		1,803,775,000
TOTAL LIABILITIES AND EQUITY	8,059,093,000		7,831,539,000
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,027,000		3,640,000
Advances to Affiliates	10,342,000		116,422,000
Accounts Receivable:
Customers	105,256,000		135,954,000
Affiliated Companies	157,242,000		176,590,000
Accrued Unbilled Revenues	55,389,000		57,887,000
Miscellaneous	8,895,000		9,327,000
Allowance for Uncollectible Accounts	(3,787,000)		(129,000)
Total Accounts Receivable	322,995,000		379,629,000
Fuel	329,858,000		328,840,000
Materials and Supplies	186,639,000		186,269,000
Risk Management Assets	33,481,000		44,313,000
Accrued Tax Benefits	3,070,000		17,785,000
Prepayments and Other Current Assets	26,604,000		26,807,000
TOTAL CURRENT ASSETS	914,016,000		1,103,705,000
Property, Plant and Equipment
Generation	8,727,339,000		8,673,296,000
Transmission	2,012,175,000		2,013,737,000
Distribution	3,737,356,000		3,722,745,000
Other Property, Plant and Equipment	585,825,000		571,154,000
Construction Work in Progress	348,366,000		354,497,000
Total Property, Plant and Equipment	15,411,061,000		15,335,429,000
Accumulated Depreciation and Amortization	5,311,018,000		5,242,805,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	10,100,043,000		10,092,624,000
Other Noncurrent Assets
Regulatory Assets	1,462,357,000		1,420,966,000
Long-term Risk Management Assets	33,956,000		48,288,000
Deferred Charges and Other Noncurrent Assets	250,306,000		320,026,000
TOTAL OTHER NONCURRENT ASSETS	1,746,619,000		1,789,280,000
TOTAL ASSETS	12,760,678,000		12,985,609,000
Current Liabilities
Advances from Affiliates	172,211,000		0
Accounts Payable	275,674,000		276,220,000
Affiliated Companies	102,678,000		153,222,000
Short-term Debt:
Long-term Debt Due Within One Year	581,000,000		856,000,000
Risk Management Liabilities	17,586,000		24,155,000
Accrued Taxes	361,287,000		467,309,000
Accrued Interest	62,504,000		63,560,000
Other Current Liabilities	231,202,000		263,638,000
TOTAL CURRENT LIABILITIES	1,804,142,000		2,104,104,000
Noncurrent Liabilities
Long-term Debt	2,579,628,000		2,804,440,000
Long-term Debt - Affiliated	400,000,000		200,000,000
Long-term Risk Management Liabilities	18,048,000		25,965,000
Deferred Income Taxes	2,402,498,000		2,345,850,000
Regulatory Liabilities and Deferred Investment Tax Credits	446,430,000		451,071,000
Deferred Credits and Other Noncurrent Liabilities	525,114,000		528,470,000
TOTAL NONCURRENT LIABILITIES	6,371,718,000		6,355,796,000
TOTAL LIABILITIES	8,175,860,000		8,459,900,000
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	2,680,908,000		2,626,134,000
Accumulated Other Comprehensive Income (Loss)	(161,390,000)		(165,725,000)
TOTAL EQUITY	4,584,818,000		4,525,709,000
TOTAL LIABILITIES AND EQUITY	12,760,678,000		12,985,609,000
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents	474,000		1,367,000
Advances to Affiliates	0		10,558,000
Accounts Receivable:
Customers	41,220,000		31,047,000
Affiliated Companies	16,335,000		24,751,000
Miscellaneous	2,594,000		6,216,000
Allowance for Uncollectible Accounts	(672,000)		(872,000)
Total Accounts Receivable	59,477,000		61,142,000
Fuel	21,597,000		22,085,000
Materials and Supplies	51,327,000		52,183,000
Risk Management Assets	712,000		509,000
Deferred Income Tax Benefits	2,780,000		7,183,000
Accrued Tax Benefits	26,168,000		11,812,000
Regulatory Asset for Under-Recovered Fuel Costs	9,867,000		0
Prepayments and Other Current Assets	5,956,000		7,633,000
TOTAL CURRENT ASSETS	178,358,000		174,472,000
Property, Plant and Equipment
Generation	1,351,151,000		1,346,530,000
Transmission	717,978,000		706,917,000
Distribution	1,878,736,000		1,859,557,000
Other Property, Plant and Equipment	212,771,000		210,549,000
Construction Work in Progress	99,494,000		95,170,000
Total Property, Plant and Equipment	4,260,130,000		4,218,723,000
Accumulated Depreciation and Amortization	1,292,967,000		1,278,941,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	2,967,163,000		2,939,782,000
Other Noncurrent Assets
Regulatory Assets	197,064,000		202,328,000
Long-term Risk Management Assets	4,000		31,000
Deferred Charges and Other Noncurrent Assets	37,158,000		8,560,000
TOTAL OTHER NONCURRENT ASSETS	234,226,000		210,919,000
TOTAL ASSETS	3,379,747,000		3,325,173,000
Current Liabilities
Advances from Affiliates	24,004,000		0
Accounts Payable	73,334,000		87,050,000
Affiliated Companies	38,025,000		36,189,000
Short-term Debt:
Long-term Debt Due Within One Year	405,000		764,000
Risk Management Liabilities	3,006,000		5,848,000
Customer Deposits	46,703,000		46,533,000
Accrued Taxes	40,037,000		28,024,000
Accrued Interest	15,016,000		12,654,000
Regulatory Liability for Over-Recovered Fuel Costs	0		7,945,000
Other Current Liabilities	60,422,000		50,684,000
TOTAL CURRENT LIABILITIES	300,952,000		275,691,000
Noncurrent Liabilities
Long-term Debt	949,451,000		949,107,000
Long-term Risk Management Liabilities	0		31,000
Deferred Income Taxes	790,848,000		740,676,000
Regulatory Liabilities and Deferred Investment Tax Credits	350,199,000		344,817,000
Employee Benefits and Pension Obligations	34,517,000		34,906,000
Deferred Credits and Other Noncurrent Liabilities	37,726,000		63,667,000
TOTAL NONCURRENT LIABILITIES	2,162,741,000		2,133,204,000
TOTAL LIABILITIES	2,463,693,000		2,408,895,000
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	388,473,000		388,530,000
Accumulated Other Comprehensive Income (Loss)	6,314,000		6,481,000
TOTAL EQUITY	916,054,000		916,278,000
TOTAL LIABILITIES AND EQUITY	3,379,747,000		3,325,173,000
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents	7,143,000		2,036,000
Advances to Affiliates	26,885,000		153,829,000
Accounts Receivable:
Customers	39,462,000		39,349,000
Affiliated Companies	29,608,000		26,288,000
Miscellaneous	20,753,000		35,514,000
Allowance for Uncollectible Accounts	(2,367,000)		(2,041,000)
Total Accounts Receivable	87,456,000		99,110,000
Fuel	128,901,000		134,234,000
Materials and Supplies	71,242,000		69,212,000
Risk Management Assets	727,000		695,000
Deferred Income Tax Benefits	102,757,000		101,403,000
Accrued Tax Benefits	19,810,000		9,616,000
Regulatory Asset for Under-Recovered Fuel Costs	8,939,000		8,527,000
Prepayments and Other Current Assets	17,955,000		16,489,000
TOTAL CURRENT ASSETS	471,815,000		595,151,000
Property, Plant and Equipment
Generation	3,902,714,000		3,888,230,000
Transmission	1,126,710,000		1,115,795,000
Distribution	1,772,135,000		1,758,988,000
Other Property, Plant and Equipment	693,621,000		688,254,000
Construction Work in Progress	130,614,000		99,783,000
Total Property, Plant and Equipment	7,625,794,000		7,551,050,000
Accumulated Depreciation and Amortization	2,317,046,000		2,284,258,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	5,308,748,000		5,266,792,000
Other Noncurrent Assets
Regulatory Assets	406,339,000		403,278,000
Long-term Risk Management Assets	4,000		0
Deferred Charges and Other Noncurrent Assets	112,871,000		76,432,000
TOTAL OTHER NONCURRENT ASSETS	519,214,000		479,710,000
TOTAL ASSETS	6,299,777,000		6,341,653,000
Current Liabilities
Accounts Payable	115,135,000		126,768,000
Affiliated Companies	48,095,000		62,835,000
Short-term Debt:
Other Short-term Debt	0		2,603,000
Long-term Debt Due Within One Year	3,250,000		3,250,000
Risk Management Liabilities	824,000		1,128,000
Customer Deposits	55,191,000		69,393,000
Accrued Taxes	69,720,000		31,532,000
Accrued Interest	18,712,000		43,950,000
Obligations Under Capital Leases	18,066,000		17,599,000
Regulatory Liability for Over-Recovered Fuel Costs	9,684,000		16,761,000
Other Current Liabilities	50,536,000		64,997,000
TOTAL CURRENT LIABILITIES	389,213,000		440,816,000
Noncurrent Liabilities
Long-term Debt	2,041,442,000		2,042,978,000
Deferred Income Taxes	1,104,268,000		1,075,551,000
Regulatory Liabilities and Deferred Investment Tax Credits	475,456,000		476,471,000
Asset Retirement Obligations	86,213,000		78,017,000
Employee Benefits and Pension Obligations	41,473,000		38,240,000
Obligations Under Capital Leases	111,820,000		114,161,000
Deferred Credits and Other Noncurrent Liabilities	48,552,000		53,946,000
TOTAL NONCURRENT LIABILITIES	3,909,224,000		3,879,364,000
TOTAL LIABILITIES	4,298,437,000		4,320,180,000
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	1,208,014,000		1,228,806,000
Accumulated Other Comprehensive Income (Loss)	(17,327,000)		(17,860,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	2,000,953,000		2,021,212,000
Noncontrolling Interests	387,000		261,000
TOTAL EQUITY	2,001,340,000		2,021,473,000
TOTAL LIABILITIES AND EQUITY	$ 6,299,777,000		$ 6,341,653,000

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