Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015		Dec. 31, 2014
Current Assets
Cash and Cash Equivalents	$ 190,000,000		$ 163,000,000
Other Temporary Investments	293,000,000		386,000,000
Accounts Receivable:
Customers	725,000,000		727,000,000
Accrued Unbilled Revenues	107,000,000		146,000,000
Pledged Accounts Receivable - AEP Credit	1,005,000,000		987,000,000
Miscellaneous	78,000,000		87,000,000
Allowance for Uncollectible Accounts	(26,000,000)		(21,000,000)
Total Accounts Receivable	1,889,000,000		1,926,000,000
Fuel	452,000,000		587,000,000
Materials and Supplies	740,000,000		738,000,000
Risk Management Assets	138,000,000		178,000,000
Regulatory Asset for Under-Recovered Fuel Costs	137,000,000		127,000,000
Margin Deposits	129,000,000		95,000,000
Prepayments and Other Current Assets	148,000,000		278,000,000
TOTAL CURRENT ASSETS	4,116,000,000		4,478,000,000
Property, Plant and Equipment
Generation	25,856,000,000		25,727,000,000
Transmission	12,531,000,000		12,433,000,000
Distribution	17,375,000,000		17,157,000,000
Other Property, Plant and Equipment	5,834,000,000		5,770,000,000
Construction Work in Progress	3,710,000,000		3,218,000,000
Total Property, Plant and Equipment	65,306,000,000		64,305,000,000
Accumulated Depreciation and Amortization	20,496,000,000		20,188,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	44,810,000,000		44,117,000,000
Other Noncurrent Assets
Regulatory Assets	4,255,000,000		4,264,000,000
Securitized Assets	2,001,000,000		2,072,000,000
Spent Nuclear Fuel and Decommissioning Trusts	2,122,000,000		2,096,000,000
Goodwill	91,000,000		91,000,000
Long-term Risk Management Assets	365,000,000		294,000,000
Deferred Charges and Other Noncurrent Assets	2,278,000,000		2,221,000,000
TOTAL OTHER NONCURRENT ASSETS	11,112,000,000		11,038,000,000
TOTAL ASSETS	60,038,000,000		59,633,000,000
Current Liabilities
Accounts Payable	1,283,000,000		1,287,000,000
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	740,000,000	[1]	744,000,000	[1]
Other Short-term Debt	115,000,000		602,000,000
Total Short-term Debt	855,000,000		1,346,000,000
Long-term Debt Due Within One Year	2,451,000,000		2,503,000,000
Long-term Debt Due Within One Year - Affiliated	0		0
Risk Management Liabilities	83,000,000		92,000,000
Customer Deposits	335,000,000		324,000,000
Accrued Taxes	846,000,000		871,000,000
Accrued Interest	227,000,000		239,000,000
Regulatory Liability for Over-Recovered Fuel Costs	48,000,000		55,000,000
Other Current Liabilities	1,000,000,000		1,250,000,000
TOTAL CURRENT LIABILITIES	7,128,000,000		7,967,000,000
Noncurrent Liabilities
Long-term Debt	16,778,000,000		16,181,000,000
Long-term Debt - Affiliated	0		0
Long-term Risk Management Liabilities	156,000,000		131,000,000
Deferred Income Taxes	11,188,000,000		10,986,000,000
Regulatory Liabilities and Deferred Investment Tax Credits	3,911,000,000		3,892,000,000
Asset Retirement Obligations	1,969,000,000		1,951,000,000
Employee Benefits and Pension Obligations	598,000,000		630,000,000
Deferred Credits and Other Noncurrent Liabilities	1,062,000,000		1,071,000,000
TOTAL NONCURRENT LIABILITIES	35,662,000,000		34,842,000,000
TOTAL LIABILITIES	42,790,000,000		42,809,000,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	3,317,000,000		3,313,000,000
Paid-in Capital	6,251,000,000		6,204,000,000
Retained Earnings	7,776,000,000		7,406,000,000
Accumulated Other Comprehensive Income (Loss)	(103,000,000)		(103,000,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	17,241,000,000		16,820,000,000
Noncontrolling Interests	7,000,000		4,000,000
TOTAL EQUITY	17,248,000,000		16,824,000,000
TOTAL LIABILITIES AND EQUITY	60,038,000,000		59,633,000,000
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents	3,902,000		2,613,000
Restricted Cash for Securitized Funding	7,884,000		15,599,000
Advances to Affiliates	152,148,000		48,519,000
Accounts Receivable:
Customers	130,929,000		114,711,000
Affiliated Companies	60,106,000		67,294,000
Accrued Unbilled Revenues	42,753,000		58,022,000
Miscellaneous	2,016,000		1,956,000
Allowance for Uncollectible Accounts	(3,445,000)		(2,364,000)
Total Accounts Receivable	232,359,000		239,619,000
Fuel	71,131,000		113,386,000
Materials and Supplies	133,917,000		131,285,000
Risk Management Assets	12,384,000		23,792,000
Deferred Income Tax Benefits	600,000		23,955,000
Regulatory Asset for Under-Recovered Fuel Costs	95,994,000		66,076,000
Prepayments and Other Current Assets	16,870,000		13,660,000
TOTAL CURRENT ASSETS	727,189,000		678,504,000
Property, Plant and Equipment
Generation	6,849,458,000		6,824,029,000
Transmission	2,238,121,000		2,228,029,000
Distribution	3,283,917,000		3,258,306,000
Other Property, Plant and Equipment	380,512,000		373,520,000
Construction Work in Progress	381,475,000		321,495,000
Total Property, Plant and Equipment	13,133,483,000		13,005,379,000
Accumulated Depreciation and Amortization	3,897,327,000		3,823,664,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	9,236,156,000		9,181,715,000
Other Noncurrent Assets
Regulatory Assets	842,030,000		857,872,000
Securitized Assets	344,631,000		350,170,000
Long-term Risk Management Assets	4,157,000		4,891,000
Deferred Charges and Other Noncurrent Assets	162,878,000		159,230,000
TOTAL OTHER NONCURRENT ASSETS	1,353,696,000		1,372,163,000
TOTAL ASSETS	11,317,041,000		11,232,382,000
Current Liabilities
Accounts Payable	186,116,000		166,821,000
Affiliated Companies	59,718,000		80,602,000
Short-term Debt:
Long-term Debt Due Within One Year	552,409,000		552,212,000
Long-term Debt Due Within One Year - Affiliated	86,000,000		86,000,000
Risk Management Liabilities	8,661,000		11,017,000
Customer Deposits	73,978,000		71,766,000
Accrued Taxes	140,980,000		109,482,000
Accrued Interest	62,966,000		52,141,000
Other Current Liabilities	113,427,000		145,017,000
TOTAL CURRENT LIABILITIES	1,284,255,000		1,275,058,000
Noncurrent Liabilities
Long-term Debt	3,330,996,000		3,342,062,000
Long-term Risk Management Liabilities	2,033,000		2,057,000
Deferred Income Taxes	2,315,890,000		2,288,842,000
Regulatory Liabilities and Deferred Investment Tax Credits	651,625,000		652,867,000
Asset Retirement Obligations	120,310,000		122,300,000
Employee Benefits and Pension Obligations	127,626,000		127,980,000
Deferred Credits and Other Noncurrent Liabilities	32,164,000		54,288,000
TOTAL NONCURRENT LIABILITIES	6,580,644,000		6,590,396,000
TOTAL LIABILITIES	7,864,899,000		7,865,454,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	260,458,000		260,458,000
Paid-in Capital	1,809,562,000		1,809,562,000
Retained Earnings	1,377,419,000		1,291,876,000
Accumulated Other Comprehensive Income (Loss)	4,703,000		5,032,000
TOTAL EQUITY	3,452,142,000		3,366,928,000
TOTAL LIABILITIES AND EQUITY	11,317,041,000		11,232,382,000
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,771,000		1,020,000
Advances to Affiliates	13,497,000		13,481,000
Accounts Receivable:
Customers	38,919,000		56,978,000
Affiliated Companies	57,523,000		72,582,000
Accrued Unbilled Revenues	1,551,000		503,000
Miscellaneous	1,663,000		1,625,000
Allowance for Uncollectible Accounts	(377,000)		(494,000)
Total Accounts Receivable	99,279,000		131,194,000
Fuel	47,969,000		54,623,000
Materials and Supplies	198,985,000		201,089,000
Risk Management Assets	9,954,000		22,328,000
Accrued Tax Benefits	6,358,000		24,788,000
Prepayments and Other Current Assets	17,963,000		27,968,000
TOTAL CURRENT ASSETS	395,776,000		476,491,000
Property, Plant and Equipment
Generation	3,780,570,000		3,741,831,000
Transmission	1,361,626,000		1,358,419,000
Distribution	1,712,898,000		1,698,409,000
Other Property, Plant and Equipment	1,474,324,000		1,490,820,000
Construction Work in Progress	563,975,000		537,237,000
Total Property, Plant and Equipment	8,893,393,000		8,826,716,000
Accumulated Depreciation and Amortization	3,440,400,000		3,410,341,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	5,452,993,000		5,416,375,000
Other Noncurrent Assets
Regulatory Assets	534,898,000		536,152,000
Spent Nuclear Fuel and Decommissioning Trusts	2,122,387,000		2,095,732,000
Long-term Risk Management Assets	2,820,000		3,317,000
Deferred Charges and Other Noncurrent Assets	137,647,000		137,209,000
TOTAL OTHER NONCURRENT ASSETS	2,797,752,000		2,772,410,000
TOTAL ASSETS	8,646,521,000		8,665,276,000
Current Liabilities
Advances from Affiliates	168,150,000		142,501,000
Accounts Payable	143,030,000		168,294,000
Affiliated Companies	57,727,000		76,010,000
Short-term Debt:
Long-term Debt Due Within One Year	374,347,000		382,187,000
Risk Management Liabilities	4,808,000		5,223,000
Customer Deposits	35,803,000		35,206,000
Accrued Taxes	82,787,000		72,742,000
Accrued Interest	13,135,000		26,677,000
Obligations Under Capital Leases	41,178,000		42,050,000
Other Current Liabilities	122,673,000		150,566,000
TOTAL CURRENT LIABILITIES	1,043,638,000		1,101,456,000
Noncurrent Liabilities
Long-term Debt	1,627,262,000		1,645,210,000
Long-term Risk Management Liabilities	1,378,000		1,395,000
Deferred Income Taxes	1,292,309,000		1,264,167,000
Regulatory Liabilities and Deferred Investment Tax Credits	1,186,521,000		1,199,694,000
Asset Retirement Obligations	1,352,747,000		1,337,179,000
Deferred Credits and Other Noncurrent Liabilities	145,764,000		162,226,000
TOTAL NONCURRENT LIABILITIES	5,605,981,000		5,609,871,000
TOTAL LIABILITIES	6,649,619,000		6,711,327,000
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	973,503,000		930,829,000
Accumulated Other Comprehensive Income (Loss)	(14,081,000)		(14,360,000)
TOTAL EQUITY	1,996,902,000		1,953,949,000
TOTAL LIABILITIES AND EQUITY	8,646,521,000		8,665,276,000
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents	4,366,000		2,870,000
Restricted Cash for Securitized Funding	17,125,000		28,687,000
Advances to Affiliates	291,256,000		312,473,000
Accounts Receivable:
Customers	59,645,000		57,906,000
Affiliated Companies	75,151,000		79,822,000
Accrued Unbilled Revenues	34,247,000		35,755,000
Miscellaneous	590,000		927,000
Allowance for Uncollectible Accounts	(113,000)		(171,000)
Total Accounts Receivable	169,520,000		174,239,000
Notes Receivable Due Within One Year - Affiliated	86,000,000		86,000,000
Materials and Supplies	68,180,000		60,909,000
Risk Management Assets	1,272,000		7,242,000
Deferred Income Tax Benefits	48,724,000		49,306,000
Accrued Tax Benefits	5,497,000		6,100,000
Prepayments and Other Current Assets	9,142,000		8,997,000
TOTAL CURRENT ASSETS	701,082,000		736,823,000
Property, Plant and Equipment
Transmission	2,124,497,000		2,104,613,000
Distribution	4,129,839,000		4,087,601,000
Other Property, Plant and Equipment	417,682,000		390,848,000
Construction Work in Progress	227,764,000		218,667,000
Total Property, Plant and Equipment	6,899,782,000		6,801,729,000
Accumulated Depreciation and Amortization	2,053,450,000		2,038,120,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	4,846,332,000		4,763,609,000
Other Noncurrent Assets
Notes Receivable - Affiliated	32,245,000		32,245,000
Regulatory Assets	1,261,382,000		1,318,939,000
Securitized Assets	103,924,000		109,999,000
Long-term Risk Management Assets	50,422,000		45,102,000
Deferred Charges and Other Noncurrent Assets	215,448,000		264,150,000
TOTAL OTHER NONCURRENT ASSETS	1,663,421,000		1,770,435,000
TOTAL ASSETS	7,210,835,000		7,270,867,000
Current Liabilities
Accounts Payable	156,577,000		145,328,000
Affiliated Companies	139,114,000		172,741,000
Short-term Debt:
Long-term Debt Due Within One Year	132,044,000		131,497,000
Risk Management Liabilities	1,491,000		1,943,000
Customer Deposits	54,854,000		53,922,000
Accrued Taxes	360,641,000		420,772,000
Accrued Interest	45,854,000		34,279,000
Other Current Liabilities	157,120,000		179,093,000
TOTAL CURRENT LIABILITIES	1,047,695,000		1,139,575,000
Noncurrent Liabilities
Long-term Debt	2,142,997,000		2,165,626,000
Long-term Risk Management Liabilities	4,292,000		3,013,000
Deferred Income Taxes	1,406,172,000		1,405,620,000
Regulatory Liabilities and Deferred Investment Tax Credits	534,000,000		514,691,000
Employee Benefits and Pension Obligations	36,378,000		36,662,000
Deferred Credits and Other Noncurrent Liabilities	31,567,000		25,470,000
TOTAL NONCURRENT LIABILITIES	4,155,406,000		4,151,082,000
TOTAL LIABILITIES	5,203,101,000		5,290,657,000
Rate Matters
Commitments and Contingencies
Equity
Common Stock	321,201,000		321,201,000
Paid-in Capital	838,782,000		838,782,000
Retained Earnings	842,492,000		814,625,000
Accumulated Other Comprehensive Income (Loss)	5,259,000		5,602,000
TOTAL EQUITY	2,007,734,000		1,980,210,000
TOTAL LIABILITIES AND EQUITY	7,210,835,000		7,270,867,000
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents	1,424,000		1,352,000
Advances to Affiliates	62,255,000		0
Accounts Receivable:
Customers	29,156,000		28,448,000
Affiliated Companies	19,075,000		22,114,000
Miscellaneous	3,793,000		6,026,000
Allowance for Uncollectible Accounts	(64,000)		(147,000)
Total Accounts Receivable	51,960,000		56,441,000
Fuel	16,639,000		16,436,000
Materials and Supplies	52,640,000		50,880,000
Risk Management Assets	9,000		0
Accrued Tax Benefits	24,986,000		24,369,000
Regulatory Asset for Under-Recovered Fuel Costs	10,704,000		35,699,000
Prepayments and Other Current Assets	15,428,000		6,524,000
TOTAL CURRENT ASSETS	236,045,000		191,701,000
Property, Plant and Equipment
Generation	1,279,389,000		1,264,724,000
Transmission	793,850,000		788,911,000
Distribution	2,124,964,000		2,080,221,000
Other Property, Plant and Equipment	428,190,000		421,568,000
Construction Work in Progress	218,241,000		204,753,000
Total Property, Plant and Equipment	4,844,634,000		4,760,177,000
Accumulated Depreciation and Amortization	1,342,464,000		1,319,554,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	3,502,170,000		3,440,623,000
Other Noncurrent Assets
Regulatory Assets	154,239,000		154,327,000
Employee Benefits and Pension Assets	19,934,000		19,335,000
Deferred Charges and Other Noncurrent Assets	32,763,000		7,557,000
TOTAL OTHER NONCURRENT ASSETS	206,936,000		181,219,000
TOTAL ASSETS	3,945,151,000		3,813,543,000
Current Liabilities
Advances from Affiliates	0		154,249,000
Accounts Payable	84,206,000		92,672,000
Affiliated Companies	47,906,000		51,744,000
Short-term Debt:
Long-term Debt Due Within One Year	430,000		427,000
Risk Management Liabilities	702,000		918,000
Customer Deposits	49,952,000		48,700,000
Accrued Taxes	36,280,000		20,887,000
Accrued Interest	16,029,000		12,699,000
Other Current Liabilities	37,311,000		58,878,000
TOTAL CURRENT LIABILITIES	272,816,000		441,174,000
Noncurrent Liabilities
Long-term Debt	1,290,585,000		1,040,609,000
Deferred Income Taxes	916,258,000		898,352,000
Regulatory Liabilities and Deferred Investment Tax Credits	346,265,000		334,479,000
Asset Retirement Obligations	37,619,000		37,030,000
Employee Benefits and Pension Obligations	20,514,000		20,095,000
Deferred Credits and Other Noncurrent Liabilities	19,384,000		13,589,000
TOTAL NONCURRENT LIABILITIES	2,630,625,000		2,344,154,000
TOTAL LIABILITIES	2,903,441,000		2,785,328,000
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	515,690,000		502,005,000
Accumulated Other Comprehensive Income (Loss)	4,753,000		4,943,000
TOTAL EQUITY	1,041,710,000		1,028,215,000
TOTAL LIABILITIES AND EQUITY	3,945,151,000		3,813,543,000
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents	7,975,000		14,356,000
Advances to Affiliates	293,378,000		41,033,000
Accounts Receivable:
Customers	39,995,000		46,738,000
Affiliated Companies	20,234,000		37,114,000
Miscellaneous	22,807,000		25,625,000
Allowance for Uncollectible Accounts	(76,000)		(516,000)
Total Accounts Receivable	82,960,000		108,961,000
Fuel	117,097,000		116,955,000
Materials and Supplies	73,982,000		73,666,000
Risk Management Assets	11,000		31,000
Deferred Income Tax Benefits	8,764,000		9,041,000
Accrued Tax Benefits	13,499,000		15,408,000
Regulatory Asset for Under-Recovered Fuel Costs	21,188,000		24,024,000
Prepayments and Other Current Assets	37,996,000		25,779,000
TOTAL CURRENT ASSETS	656,850,000		429,254,000
Property, Plant and Equipment
Generation	3,907,999,000		3,864,543,000
Transmission	1,310,952,000		1,300,729,000
Distribution	1,906,290,000		1,894,572,000
Other Property, Plant and Equipment	887,719,000		878,753,000
Construction Work in Progress	519,678,000		471,980,000
Total Property, Plant and Equipment	8,532,638,000		8,410,577,000
Accumulated Depreciation and Amortization	2,541,492,000		2,503,290,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	5,991,146,000		5,907,287,000
Other Noncurrent Assets
Regulatory Assets	410,925,000		393,602,000
Deferred Charges and Other Noncurrent Assets	130,685,000		86,750,000
TOTAL OTHER NONCURRENT ASSETS	541,610,000		480,352,000
TOTAL ASSETS	7,189,606,000		6,816,893,000
Current Liabilities
Accounts Payable	143,229,000		175,109,000
Affiliated Companies	60,373,000		67,410,000
Short-term Debt:
Long-term Debt Due Within One Year	253,250,000		306,750,000
Risk Management Liabilities	4,197,000		1,082,000
Customer Deposits	60,861,000		59,903,000
Accrued Taxes	85,192,000		43,965,000
Accrued Interest	18,841,000		44,328,000
Obligations Under Capital Leases	17,572,000		17,557,000
Other Current Liabilities	55,579,000		104,553,000
TOTAL CURRENT LIABILITIES	699,094,000		820,657,000
Noncurrent Liabilities
Long-term Debt	2,282,111,000		1,833,687,000
Deferred Income Taxes	1,379,089,000		1,351,111,000
Regulatory Liabilities and Deferred Investment Tax Credits	457,238,000		458,530,000
Asset Retirement Obligations	92,635,000		92,015,000
Employee Benefits and Pension Obligations	31,147,000		25,374,000
Obligations Under Capital Leases	87,434,000		91,044,000
Deferred Credits and Other Noncurrent Liabilities	47,655,000		47,274,000
TOTAL NONCURRENT LIABILITIES	4,377,309,000		3,899,035,000
TOTAL LIABILITIES	5,076,403,000		4,719,692,000
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	1,309,690,000		1,293,986,000
Accumulated Other Comprehensive Income (Loss)	(7,139,000)		(7,466,000)
TOTAL COMMON SHAREHOLDER'S EQUITY	2,112,817,000		2,096,786,000
Noncontrolling Interests	386,000		415,000
TOTAL EQUITY	2,113,203,000		2,097,201,000
TOTAL LIABILITIES AND EQUITY	$ 7,189,606,000		$ 6,816,893,000

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