Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Vertically Integrated Utilities	$ 2,436,000	$ 2,432,000	$ 7,082,000	$ 7,217,000
Transmission and Distribution Utilities	1,164,000	1,163,000	3,378,000	3,388,000
Generation & Marketing	802,000	538,000	2,289,000	1,932,000
Other Revenues	30,000	28,000	90,000	22,000
TOTAL REVENUES	4,432,000	4,161,000	12,839,000	12,559,000
Expenses
Fuel and Other Consumables Used for Electric Generation	955,000	1,080,000	2,782,000	3,291,000
Purchased Electricity for Resale	731,000	449,000	2,050,000	1,560,000
Other Operation	691,000	685,000	1,955,000	1,985,000
Maintenance	312,000	313,000	923,000	929,000
Depreciation and Amortization	535,000	499,000	1,528,000	1,418,000
Taxes Other Than Income Taxes	248,000	230,000	733,000	679,000
TOTAL EXPENSES	3,472,000	3,256,000	9,971,000	9,862,000
OPERATING INCOME (LOSS)	960,000	905,000	2,868,000	2,697,000
Other Income (Expense):
Interest and Investment Income	2,000	1,000	6,000	5,000
Carrying Costs Income	1,000	7,000	18,000	22,000
Allowance for Equity Funds Used During Construction	33,000	27,000	97,000	74,000
Interest Expense	(221,000)	(217,000)	(659,000)	(650,000)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	775,000	723,000	2,330,000	2,148,000
Income Tax Expense (Credit)	275,000	264,000	827,000	783,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	12,000	24,000	61,000	65,000
Income from Continuing Operations	512,000	483,000	1,564,000	1,430,000
Income from Discontinued Operations, Net of Tax	8,000	11,000	18,000	16,000
NET INCOME (LOSS)	520,000	494,000	1,582,000	1,446,000
Net Income Attributable to Noncontrolling Interests	1,000	1,000	4,000	3,000
EARNINGS ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 519,000	$ 493,000	$ 1,578,000	$ 1,443,000
Earnings Per Share
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING	490,648,929	488,912,892	490,155,315	488,361,017
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.04	$ 0.99	$ 3.18	$ 2.92
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.02	0.02	0.04	0.03
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 1.06	$ 1.01	$ 3.22	$ 2.95
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING	490,800,335	488,970,647	490,411,020	488,597,178
Income (Loss) from Continuing Operations, Per Diluted Share	$ 1.04	$ 0.99	$ 3.18	$ 2.92
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.02	0.02	0.04	0.03
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	1.06	1.01	3.22	2.95
CASH DIVIDENDS DECLARED PER SHARE	$ 0.53	$ 0.5	$ 1.59	$ 1.5
Appalachian Power Co [Member]
Revenues
Vertically Integrated Utilities	$ 685,312	$ 672,459	$ 2,184,943	$ 2,202,967
Sales to AEP Affiliates	39,389	35,455	115,740	108,439
Other Revenues	2,857	1,970	7,870	6,537
TOTAL REVENUES	727,558	709,884	2,308,553	2,317,943
Expenses
Fuel and Other Consumables Used for Electric Generation	188,576	194,303	595,308	627,943
Purchased Electricity for Resale	80,452	85,656	258,836	340,680
Purchased Electricity from AEP Affiliates	0	0	0	4,662
Other Operation	101,841	103,835	311,631	297,269
Maintenance	70,459	64,333	179,793	193,907
Depreciation and Amortization	96,295	99,889	292,735	300,125
Taxes Other Than Income Taxes	32,002	31,632	93,089	92,434
TOTAL EXPENSES	569,625	579,648	1,731,392	1,857,020
OPERATING INCOME (LOSS)	157,933	130,236	577,161	460,923
Other Income (Expense):
Interest Income	290	521	1,128	1,311
Carrying Costs Income	73	482	783	(1,130)
Allowance for Equity Funds Used During Construction	3,432	1,665	10,337	4,525
Interest Expense	(46,625)	(52,738)	(145,600)	(157,540)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	115,103	80,166	443,809	308,089
Income Tax Expense (Credit)	40,507	31,408	168,368	121,233
NET INCOME (LOSS)	74,596	48,758	275,441	186,856
Indiana Michigan Power Co [Member]
Revenues
Vertically Integrated Utilities	536,227	520,881	1,617,504	1,642,721
Sales to AEP Affiliates	9,677	401	16,634	3,753
Other Revenues - Affiliated	21,672	20,832	62,183	70,821
Other Revenues	786	749	2,626	1,298
TOTAL REVENUES	568,362	542,863	1,698,947	1,718,593
Expenses
Fuel and Other Consumables Used for Electric Generation	90,499	117,414	264,424	387,757
Purchased Electricity for Resale	41,544	20,019	147,711	52,467
Purchased Electricity from AEP Affiliates	67,281	66,561	182,239	203,807
Other Operation	141,054	144,331	407,320	431,953
Maintenance	53,727	59,043	160,907	161,854
Depreciation and Amortization	49,215	50,585	150,162	150,062
Taxes Other Than Income Taxes	21,608	22,059	66,992	64,685
TOTAL EXPENSES	464,928	480,012	1,379,755	1,452,585
OPERATING INCOME (LOSS)	103,434	62,851	319,192	266,008
Other Income (Expense):
Interest Income	1,896	1,450	7,222	4,228
Allowance for Equity Funds Used During Construction	2,157	5,596	9,107	14,364
Interest Expense	(23,144)	(22,617)	(68,889)	(71,955)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	84,343	47,280	266,632	212,645
Income Tax Expense (Credit)	27,691	20,654	86,725	71,596
NET INCOME (LOSS)	56,652	26,626	179,907	141,049
Ohio Power Co [Member]
Revenues
Transmission and Distribution Utilities	775,905	793,900	2,320,372	2,380,768
Sales to AEP Affiliates	4,426	43,733	79,690	120,154
Other Revenues	1,953	1,564	6,416	4,628
TOTAL REVENUES	782,284	839,197	2,406,478	2,505,550
Expenses
Purchased Electricity for Resale	173,094	48,541	431,608	191,730
Purchased Electricity from AEP Affiliates	45,834	315,903	462,645	897,658
Amortization of Generation Deferrals	55,466	26,655	122,221	82,818
Other Operation	170,144	145,163	446,817	428,074
Maintenance	39,437	53,724	121,224	136,965
Depreciation and Amortization	63,757	54,968	178,609	165,152
Taxes Other Than Income Taxes	93,666	89,564	283,092	268,734
TOTAL EXPENSES	641,398	734,518	2,046,216	2,171,131
OPERATING INCOME (LOSS)	140,886	104,679	360,262	334,419
Other Income (Expense):
Interest Income	1,165	1,986	4,328	8,159
Carrying Costs Income	(1,576)	5,606	10,037	19,594
Allowance for Equity Funds Used During Construction	2,228	1,825	7,015	4,893
Interest Expense	(32,593)	(31,171)	(96,313)	(96,937)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	110,110	82,925	285,329	270,128
Income Tax Expense (Credit)	38,541	28,865	100,641	98,759
NET INCOME (LOSS)	71,569	54,060	184,688	171,369
Public Service Co Of Oklahoma [Member]
Revenues
Vertically Integrated Utilities	418,592	415,193	1,040,876	1,028,427
Sales to AEP Affiliates	1,062	789	3,505	6,240
Other Revenues	709	1,009	2,258	2,524
TOTAL REVENUES	420,363	416,991	1,046,639	1,037,191
Expenses
Fuel and Other Consumables Used for Electric Generation	87,680	85,018	226,260	192,567
Purchased Electricity for Resale	103,226	117,521	253,785	301,816
Purchased Electricity from AEP Affiliates	0	0	0	11,024
Other Operation	77,541	71,605	199,334	193,101
Maintenance	27,239	21,800	74,322	76,223
Depreciation and Amortization	30,832	24,496	90,148	73,085
Taxes Other Than Income Taxes	9,327	9,137	27,843	27,757
TOTAL EXPENSES	335,845	329,577	871,692	875,573
OPERATING INCOME (LOSS)	84,518	87,414	174,947	161,618
Other Income (Expense):
Interest Income	127	137	255	138
Allowance for Equity Funds Used During Construction	2,342	194	5,952	2,215
Interest Expense	(14,950)	(13,913)	(44,372)	(41,009)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	72,037	73,832	136,782	122,962
Income Tax Expense (Credit)	27,298	28,746	51,260	46,979
NET INCOME (LOSS)	44,739	45,086	85,522	75,983
Southwestern Electric Power Co [Member]
Revenues
Vertically Integrated Utilities	525,922	526,047	1,387,644	1,397,326
Sales to AEP Affiliates	5,959	5,203	13,115	22,748
Other Revenues	618	521	1,486	1,570
TOTAL REVENUES	532,499	531,771	1,402,245	1,421,644
Expenses
Fuel and Other Consumables Used for Electric Generation	179,995	194,175	463,092	500,878
Purchased Electricity for Resale	23,597	36,960	70,799	138,380
Purchased Electricity from AEP Affiliates	0	0	0	3,766
Other Operation	81,391	68,601	214,835	206,442
Maintenance	34,425	29,867	100,076	93,946
Depreciation and Amortization	48,862	46,791	143,780	138,316
Taxes Other Than Income Taxes	23,014	22,246	66,062	63,272
TOTAL EXPENSES	391,284	398,640	1,058,644	1,145,000
OPERATING INCOME (LOSS)	141,215	133,131	343,601	276,644
Other Income (Expense):
Interest Income	69	230	1,233	322
Allowance for Equity Funds Used During Construction	7,053	3,137	18,164	7,415
Interest Expense	(29,263)	(31,644)	(91,423)	(95,258)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	119,074	104,854	271,575	189,123
Income Tax Expense (Credit)	37,358	31,042	85,417	60,252
Equity Earnings (Loss) of Unconsolidated Subsidiaries	410	735	2,131	1,461
NET INCOME (LOSS)	82,126	74,547	188,289	130,332
Net Income Attributable to Noncontrolling Interests	1,013	1,109	3,002	3,337
EARNINGS ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 81,113	$ 73,438	$ 185,287	$ 126,995