Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Current Assets
Cash and Cash Equivalents		$ 178,000	$ 163,000
Other Temporary Investments		315,000	386,000
Accounts Receivable:
Customers		662,000	637,000
Accrued Unbilled Revenues		147,000	146,000
Pledged Accounts Receivable - AEP Credit		987,000	987,000
Miscellaneous		84,000	85,000
Allowance for Uncollectible Accounts		(27,000)	(20,000)
Total Accounts Receivable		1,853,000	1,835,000
Fuel		376,000	581,000
Materials and Supplies		729,000	736,000
Risk Management Assets		143,000	178,000
Regulatory Asset for Under-Recovered Fuel Costs		105,000	127,000
Margin Deposits		85,000	95,000
Assets Held for Sale		608,000	103,000
Prepayments and Other Current Assets		156,000	274,000
TOTAL CURRENT ASSETS		4,548,000	4,478,000
Property, Plant and Equipment
Generation		25,665,000	25,727,000
Transmission		13,305,000	12,433,000
Distribution		17,812,000	17,157,000
Other Property, Plant and Equipment		4,036,000	5,074,000
Construction Work in Progress		4,008,000	3,215,000
Total Property, Plant and Equipment		64,826,000	63,606,000
Accumulated Depreciation and Amortization		19,588,000	19,971,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		45,238,000	43,635,000
Other Noncurrent Assets
Regulatory Assets		4,950,000	4,264,000
Securitized Assets		1,841,000	2,072,000
Spent Nuclear Fuel and Decommissioning Trusts		2,047,000	2,096,000
Goodwill		53,000	53,000
Long-term Risk Management Assets		353,000	294,000
Assets Held for Sale		0	522,000
Deferred Charges and Other Noncurrent Assets		2,069,000	2,219,000
TOTAL OTHER NONCURRENT ASSETS		11,313,000	11,520,000
TOTAL ASSETS		61,099,000	59,633,000
Current Liabilities
Accounts Payable		1,274,000	1,258,000
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	750,000	744,000
Other Short-term Debt		32,000	602,000
Total Short-term Debt		782,000	1,346,000
Long-term Debt Due Within One Year		1,826,000	2,500,000
Long-term Debt Due Within One Year - Affiliated		0	0
Risk Management Liabilities		75,000	92,000
Customer Deposits		335,000	324,000
Accrued Taxes		748,000	863,000
Accrued Interest		236,000	238,000
Regulatory Liability for Over-Recovered Fuel Costs		74,000	55,000
Liabilities Held for Sale		474,000	85,000
Other Current Liabilities		1,234,000	1,206,000
TOTAL CURRENT LIABILITIES		7,058,000	7,967,000
Noncurrent Liabilities
Long-term Debt		17,600,000	16,101,000
Long-term Risk Management Liabilities		201,000	131,000
Deferred Income Taxes		11,425,000	10,892,000
Regulatory Liabilities and Deferred Investment Tax Credits		3,762,000	3,892,000
Asset Retirement Obligations		1,944,000	1,951,000
Employee Benefits and Pension Obligations		535,000	630,000
Liabilities Held for Sale		0	350,000
Deferred Credits and Other Noncurrent Liabilities		865,000	895,000
TOTAL NONCURRENT LIABILITIES		36,332,000	34,842,000
TOTAL LIABILITIES		$ 43,390,000	$ 42,809,000
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		600,000,000	600,000,000
Common Stock, Shares, Issued		511,141,256	509,739,159
Equity
Common Stock		$ 3,322,000	$ 3,313,000
Paid-in Capital		6,282,000	6,204,000
Retained Earnings		8,204,000	7,406,000
Accumulated Other Comprehensive Income (Loss)		(109,000)	(103,000)
TOTAL COMMON SHAREHOLDER'S EQUITY		17,699,000	16,820,000
Noncontrolling Interests		10,000	4,000
TOTAL EQUITY		17,709,000	16,824,000
TOTAL LIABILITIES AND EQUITY		61,099,000	59,633,000
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		2,411	2,613
Restricted Cash for Securitized Funding		7,436	15,599
Advances to Affiliates		23,535	48,519
Accounts Receivable:
Customers		118,331	114,711
Affiliated Companies		56,687	67,294
Accrued Unbilled Revenues		36,629	58,022
Miscellaneous		3,180	1,956
Allowance for Uncollectible Accounts		(3,961)	(2,364)
Total Accounts Receivable		210,866	239,619
Fuel		77,785	113,386
Materials and Supplies		126,941	131,285
Risk Management Assets		25,970	23,792
Risk Management Assets - Affiliated		1,380	0
Deferred Income Tax Benefits		0	23,955
Regulatory Asset for Under-Recovered Fuel Costs		69,013	66,076
Prepayments and Other Current Assets		27,673	13,660
TOTAL CURRENT ASSETS		573,010	678,504
Property, Plant and Equipment
Generation		6,174,000	6,824,029
Transmission		2,271,351	2,228,029
Distribution		3,351,264	3,258,306
Other Property, Plant and Equipment		390,180	373,520
Construction Work in Progress		535,112	321,495
Total Property, Plant and Equipment		12,721,907	13,005,379
Accumulated Depreciation and Amortization		3,426,961	3,823,664
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,294,946	9,181,715
Other Noncurrent Assets
Regulatory Assets		1,061,715	857,872
Securitized Assets		333,491	350,170
Long-term Risk Management Assets		2,035	4,891
Deferred Charges and Other Noncurrent Assets		141,012	159,230
TOTAL OTHER NONCURRENT ASSETS		1,538,253	1,372,163
TOTAL ASSETS		11,406,209	11,232,382
Current Liabilities
Advances from Affiliates		35,224	0
Accounts Payable		186,317	166,821
Affiliated Companies		74,006	80,602
Short-term Debt:
Long-term Debt Due Within One Year		318,020	552,212
Long-term Debt Due Within One Year - Affiliated		0	86,000
Risk Management Liabilities		6,902	11,017
Customer Deposits		79,237	71,766
Accrued Taxes		45,938	109,482
Accrued Interest		63,837	52,141
Other Current Liabilities		182,191	145,017
TOTAL CURRENT LIABILITIES		991,672	1,275,058
Noncurrent Liabilities
Long-term Debt		3,637,275	3,342,062
Long-term Risk Management Liabilities		973	2,057
Deferred Income Taxes		2,410,754	2,288,842
Regulatory Liabilities and Deferred Investment Tax Credits		646,262	652,867
Asset Retirement Obligations		110,474	122,300
Employee Benefits and Pension Obligations		119,986	127,980
Deferred Credits and Other Noncurrent Liabilities		29,159	54,288
TOTAL NONCURRENT LIABILITIES		6,954,883	6,590,396
TOTAL LIABILITIES		$ 7,946,555	$ 7,865,454
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		30,000,000	30,000,000
Equity
Common Stock		$ 260,458	$ 260,458
Paid-in Capital		1,809,562	1,809,562
Retained Earnings		1,386,067	1,291,876
Accumulated Other Comprehensive Income (Loss)		3,567	5,032
TOTAL EQUITY		3,459,654	3,366,928
TOTAL LIABILITIES AND EQUITY		11,406,209	11,232,382
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		1,264	1,020
Advances to Affiliates		13,508	13,481
Accounts Receivable:
Customers		58,950	56,978
Affiliated Companies		63,135	72,582
Accrued Unbilled Revenues		2,254	503
Miscellaneous		1,409	1,625
Allowance for Uncollectible Accounts		(21)	(494)
Total Accounts Receivable		125,727	131,194
Fuel		24,687	54,623
Materials and Supplies		189,764	201,089
Risk Management Assets		8,574	22,328
Risk Management Assets - Affiliated		2,053	0
Accrued Tax Benefits		6,232	24,788
Prepayments and Other Current Assets		27,549	27,968
TOTAL CURRENT ASSETS		399,358	476,491
Property, Plant and Equipment
Generation		3,968,224	3,741,831
Transmission		1,380,689	1,358,419
Distribution		1,758,347	1,698,409
Other Property, Plant and Equipment		745,858	1,490,820
Construction Work in Progress		470,794	537,237
Total Property, Plant and Equipment		8,323,912	8,826,716
Accumulated Depreciation and Amortization		3,084,188	3,410,341
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,239,724	5,416,375
Other Noncurrent Assets
Regulatory Assets		818,168	536,152
Spent Nuclear Fuel and Decommissioning Trusts		2,047,260	2,095,732
Long-term Risk Management Assets		1,338	3,317
Deferred Charges and Other Noncurrent Assets		123,676	137,209
TOTAL OTHER NONCURRENT ASSETS		2,990,442	2,772,410
TOTAL ASSETS		8,629,524	8,665,276
Current Liabilities
Advances from Affiliates		151,004	142,501
Accounts Payable		132,292	168,294
Affiliated Companies		70,812	76,010
Short-term Debt:
Long-term Debt Due Within One Year		301,148	382,187
Risk Management Liabilities		4,615	5,223
Customer Deposits		35,641	35,206
Accrued Taxes		58,791	72,742
Accrued Interest		13,263	26,677
Obligations Under Capital Leases		40,375	42,050
Other Current Liabilities		151,489	150,566
TOTAL CURRENT LIABILITIES		959,430	1,101,456
Noncurrent Liabilities
Long-term Debt		1,759,503	1,645,210
Long-term Risk Management Liabilities		1,248	1,395
Deferred Income Taxes		1,329,163	1,264,167
Regulatory Liabilities and Deferred Investment Tax Credits		1,041,910	1,199,694
Asset Retirement Obligations		1,379,004	1,337,179
Deferred Credits and Other Noncurrent Liabilities		114,575	162,226
TOTAL NONCURRENT LIABILITIES		5,625,403	5,609,871
TOTAL LIABILITIES		$ 6,584,833	$ 6,711,327
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		2,500,000	2,500,000
Equity
Common Stock		$ 56,584	$ 56,584
Paid-in Capital		980,896	980,896
Retained Earnings		1,020,736	930,829
Accumulated Other Comprehensive Income (Loss)		(13,525)	(14,360)
TOTAL EQUITY		2,044,691	1,953,949
TOTAL LIABILITIES AND EQUITY		8,629,524	8,665,276
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		3,248	2,870
Restricted Cash for Securitized Funding		16,195	28,687
Advances to Affiliates		279,129	312,473
Accounts Receivable:
Customers		35,711	57,906
Affiliated Companies		57,240	79,822
Accrued Unbilled Revenues		39,236	35,755
Miscellaneous		1,246	927
Allowance for Uncollectible Accounts		(421)	(171)
Total Accounts Receivable		133,012	174,239
Notes Receivable Due Within One Year - Affiliated		0	86,000
Materials and Supplies		75,878	60,909
Risk Management Assets		0	7,242
Deferred Income Tax Benefits		20,568	49,306
Accrued Tax Benefits		5,030	6,100
Prepayments and Other Current Assets		11,141	8,997
TOTAL CURRENT ASSETS		544,201	736,823
Property, Plant and Equipment
Transmission		2,181,389	2,104,613
Distribution		4,231,051	4,087,601
Other Property, Plant and Equipment		446,485	390,848
Construction Work in Progress		212,093	218,667
Total Property, Plant and Equipment		7,071,018	6,801,729
Accumulated Depreciation and Amortization		2,086,931	2,038,120
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		4,984,087	4,763,609
Other Noncurrent Assets
Notes Receivable - Affiliated		32,245	32,245
Regulatory Assets		1,150,864	1,318,939
Securitized Assets		91,899	109,999
Long-term Risk Management Assets		23,265	45,102
Deferred Charges and Other Noncurrent Assets		118,942	264,150
TOTAL OTHER NONCURRENT ASSETS		1,417,215	1,770,435
TOTAL ASSETS		6,945,503	7,270,867
Current Liabilities
Accounts Payable		141,073	145,328
Affiliated Companies		88,324	172,741
Short-term Debt:
Long-term Debt Due Within One Year		395,938	131,497
Risk Management Liabilities		2,823	1,943
Customer Deposits		60,235	53,922
Accrued Taxes		285,003	420,772
Accrued Interest		45,452	34,279
Other Current Liabilities		147,567	179,093
TOTAL CURRENT LIABILITIES		1,166,415	1,139,575
Noncurrent Liabilities
Long-term Debt		1,770,112	2,165,626
Long-term Risk Management Liabilities		4,871	3,013
Deferred Income Taxes		1,402,369	1,405,620
Regulatory Liabilities and Deferred Investment Tax Credits		535,458	514,691
Employee Benefits and Pension Obligations		29,978	36,662
Deferred Credits and Other Noncurrent Liabilities		28,682	25,470
TOTAL NONCURRENT LIABILITIES		3,771,470	4,151,082
TOTAL LIABILITIES		$ 4,937,885	$ 5,290,657
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		40,000,000	40,000,000
Equity
Common Stock		$ 321,201	$ 321,201
Paid-in Capital		838,782	838,782
Retained Earnings		843,063	814,625
Accumulated Other Comprehensive Income (Loss)		4,572	5,602
TOTAL EQUITY		2,007,618	1,980,210
TOTAL LIABILITIES AND EQUITY		6,945,503	7,270,867
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		1,663	1,352
Advances to Affiliates		116,345	0
Accounts Receivable:
Customers		24,770	28,448
Affiliated Companies		25,117	22,114
Miscellaneous		9,559	6,026
Allowance for Uncollectible Accounts		(359)	(147)
Total Accounts Receivable		59,087	56,441
Fuel		15,864	16,436
Materials and Supplies		52,519	50,880
Risk Management Assets		1,035	0
Deferred Income Tax Benefits		8,975	0
Accrued Tax Benefits		19,093	24,369
Regulatory Asset for Under-Recovered Fuel Costs		0	35,699
Prepayments and Other Current Assets		7,280	6,524
TOTAL CURRENT ASSETS		281,861	191,701
Property, Plant and Equipment
Generation		1,296,921	1,264,724
Transmission		805,505	788,911
Distribution		2,185,778	2,080,221
Other Property, Plant and Equipment		435,807	421,568
Construction Work in Progress		274,470	204,753
Total Property, Plant and Equipment		4,998,481	4,760,177
Accumulated Depreciation and Amortization		1,383,116	1,319,554
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,615,365	3,440,623
Other Noncurrent Assets
Regulatory Assets		180,605	154,327
Employee Benefits and Pension Assets		21,231	19,335
Deferred Charges and Other Noncurrent Assets		15,664	7,557
TOTAL OTHER NONCURRENT ASSETS		217,500	181,219
TOTAL ASSETS		4,114,726	3,813,543
Current Liabilities
Advances from Affiliates		0	154,249
Accounts Payable		98,777	92,672
Affiliated Companies		37,267	51,744
Short-term Debt:
Long-term Debt Due Within One Year		150,437	427
Risk Management Liabilities		70	918
Customer Deposits		50,147	48,700
Accrued Taxes		36,637	20,887
Accrued Interest		15,499	12,699
Regulatory Liability for Over-Recovered Fuel Costs		41,175	0
Other Current Liabilities		56,255	58,878
TOTAL CURRENT LIABILITIES		486,264	441,174
Noncurrent Liabilities
Long-term Debt		1,140,536	1,040,609
Long-term Risk Management Liabilities		8	0
Deferred Income Taxes		958,168	898,352
Regulatory Liabilities and Deferred Investment Tax Credits		339,161	334,479
Asset Retirement Obligations		42,680	37,030
Employee Benefits and Pension Obligations		16,456	20,095
Deferred Credits and Other Noncurrent Liabilities		18,285	13,589
TOTAL NONCURRENT LIABILITIES		2,515,294	2,344,154
TOTAL LIABILITIES		$ 3,001,558	$ 2,785,328
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		11,000,000	11,000,000
Common Stock, Shares, Issued		10,482,000	10,482,000
Equity
Common Stock		$ 157,230	$ 157,230
Paid-in Capital		364,037	364,037
Retained Earnings		587,527	502,005
Accumulated Other Comprehensive Income (Loss)		4,374	4,943
TOTAL EQUITY		1,113,168	1,028,215
TOTAL LIABILITIES AND EQUITY		4,114,726	3,813,543
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		14,258	14,356
Advances to Affiliates		45,019	41,033
Accounts Receivable:
Customers		41,086	46,738
Affiliated Companies		33,937	37,114
Miscellaneous		31,322	25,625
Allowance for Uncollectible Accounts		(148)	(516)
Total Accounts Receivable		106,197	108,961
Fuel		93,125	116,955
Materials and Supplies		72,735	73,666
Risk Management Assets		1,280	31
Deferred Income Tax Benefits		7,406	9,041
Accrued Tax Benefits		1,413	15,408
Regulatory Asset for Under-Recovered Fuel Costs		14,352	24,024
Prepayments and Other Current Assets		20,083	25,779
TOTAL CURRENT ASSETS		375,868	429,254
Property, Plant and Equipment
Generation		3,928,939	3,864,543
Transmission		1,362,543	1,300,729
Distribution		1,945,074	1,894,572
Other Property, Plant and Equipment		895,958	878,753
Construction Work in Progress		681,991	471,980
Total Property, Plant and Equipment		8,814,505	8,410,577
Accumulated Depreciation and Amortization		2,611,129	2,503,290
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,203,376	5,907,287
Other Noncurrent Assets
Regulatory Assets		413,434	393,602
Employee Benefits and Pension Assets		23,437	21,427
Deferred Charges and Other Noncurrent Assets		85,491	65,323
TOTAL OTHER NONCURRENT ASSETS		522,362	480,352
TOTAL ASSETS		7,101,606	6,816,893
Current Liabilities
Accounts Payable		160,885	175,109
Affiliated Companies		58,866	67,410
Short-term Debt:
Long-term Debt Due Within One Year		3,250	306,750
Risk Management Liabilities		1,302	1,082
Customer Deposits		60,594	59,903
Accrued Taxes		83,125	43,965
Accrued Interest		23,097	44,328
Obligations Under Capital Leases		22,081	17,557
Other Current Liabilities		81,965	104,553
TOTAL CURRENT LIABILITIES		495,165	820,657
Noncurrent Liabilities
Long-term Debt		2,280,716	1,833,687
Long-term Risk Management Liabilities		757	0
Deferred Income Taxes		1,415,833	1,351,111
Regulatory Liabilities and Deferred Investment Tax Credits		457,438	458,530
Asset Retirement Obligations		108,093	92,015
Employee Benefits and Pension Obligations		26,224	25,374
Obligations Under Capital Leases		74,533	91,044
Deferred Credits and Other Noncurrent Liabilities		47,664	47,274
TOTAL NONCURRENT LIABILITIES		4,411,258	3,899,035
TOTAL LIABILITIES		$ 4,906,423	$ 4,719,692
Rate Matters
Commitments and Contingencies
Common Stock, Shares Authorized		7,600,000	7,600,000
Equity
Common Stock		$ 135,660	$ 135,660
Paid-in Capital		676,551	674,606
Retained Earnings		1,389,273	1,293,986
Accumulated Other Comprehensive Income (Loss)		(6,619)	(7,466)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,194,865	2,096,786
Noncontrolling Interests		318	415
TOTAL EQUITY		2,195,183	2,097,201
TOTAL LIABILITIES AND EQUITY		$ 7,101,606	$ 6,816,893

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