Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Vertically Integrated Utilities	$ 2,432,000,000	$ 2,543,000,000	$ 7,217,000,000	$ 7,075,000,000
Transmission and Distribution Utilities	1,163,000,000	1,139,000,000	3,388,000,000	3,248,000,000
Generation & Marketing	538,000,000	359,000,000	1,932,000,000	915,000,000
Other Revenues	169,000,000	135,000,000	457,000,000	346,000,000
TOTAL REVENUES	4,302,000,000	4,176,000,000	12,994,000,000	11,584,000,000
Expenses
Fuel and Other Consumables Used for Electric Generation	1,080,000,000	1,168,000,000	3,291,000,000	3,107,000,000
Purchased Electricity for Resale	449,000,000	373,000,000	1,560,000,000	1,103,000,000
Other Operation	787,000,000	677,000,000	2,327,000,000	2,079,000,000
Maintenance	321,000,000	261,000,000	953,000,000	839,000,000
Asset Impairments and Other Related Charges	0	144,000,000	0	298,000,000
Depreciation and Amortization	507,000,000	447,000,000	1,441,000,000	1,310,000,000
Taxes Other Than Income Taxes	233,000,000	231,000,000	689,000,000	671,000,000
TOTAL EXPENSES	3,377,000,000	3,301,000,000	10,261,000,000	9,407,000,000
OPERATING INCOME (LOSS)	925,000,000	875,000,000	2,733,000,000	2,177,000,000
Other Income (Expense):
Interest and Investment Income	1,000,000	3,000,000	5,000,000	55,000,000
Carrying Costs Income	7,000,000	8,000,000	22,000,000	20,000,000
Allowance for Equity Funds Used During Construction	27,000,000	19,000,000	74,000,000	51,000,000
Interest Expense	(221,000,000)	(225,000,000)	(662,000,000)	(685,000,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	739,000,000	680,000,000	2,172,000,000	1,618,000,000
Income Tax Expense (Credit)	269,000,000	257,000,000	791,000,000	520,000,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	24,000,000	11,000,000	65,000,000	39,000,000
NET INCOME (LOSS)	494,000,000	434,000,000	1,446,000,000	1,137,000,000
Net Income Attributable to Noncontrolling Interests	1,000,000	1,000,000	3,000,000	3,000,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	493,000,000	433,000,000	1,443,000,000	1,134,000,000
Earnings Per Share
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING	488,912,892	486,932,747	488,361,017	486,353,876
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 1.01	$ 0.89	$ 2.95	$ 2.33
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING	488,970,647	487,258,905	488,597,178	486,792,914
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 1.01	$ 0.89	$ 2.95	$ 2.33
CASH DIVIDENDS DECLARED PER SHARE	$ 0.5	$ 0.49	$ 1.5	$ 1.45
Appalachian Power Co [Member]
Revenues
Vertically Integrated Utilities	672,459,000	756,606,000	2,202,967,000	2,299,587,000
Sales to AEP Affiliates	35,455,000	90,558,000	108,439,000	241,311,000
Other Revenues	1,970,000	2,569,000	6,537,000	6,833,000
TOTAL REVENUES	709,884,000	849,733,000	2,317,943,000	2,547,731,000
Expenses
Fuel and Other Consumables Used for Electric Generation	194,303,000	207,442,000	627,943,000	575,902,000
Purchased Electricity for Resale	85,656,000	47,391,000	340,680,000	172,334,000
Purchased Electricity from AEP Affiliates	0	220,736,000	4,662,000	625,534,000
Other Operation	103,835,000	64,508,000	297,269,000	223,180,000
Maintenance	64,333,000	49,924,000	193,907,000	207,870,000
Depreciation and Amortization	99,889,000	84,513,000	300,125,000	255,656,000
Taxes Other Than Income Taxes	31,632,000	27,527,000	92,434,000	82,931,000
TOTAL EXPENSES	579,648,000	702,041,000	1,857,020,000	2,143,407,000
OPERATING INCOME (LOSS)	130,236,000	147,692,000	460,923,000	404,324,000
Other Income (Expense):
Interest Income	521,000	334,000	1,311,000	2,134,000
Carrying Costs Income	482,000	2,793,000	(1,130,000)	6,029,000
Allowance for Equity Funds Used During Construction	1,665,000	826,000	4,525,000	2,809,000
Interest Expense	(52,738,000)	(47,375,000)	(157,540,000)	(143,707,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	80,166,000	104,270,000	308,089,000	271,589,000
Income Tax Expense (Credit)	31,408,000	41,645,000	121,233,000	108,554,000
NET INCOME (LOSS)	48,758,000	62,625,000	186,856,000	163,035,000
Indiana Michigan Power Co [Member]
Revenues
Vertically Integrated Utilities	520,881,000	537,453,000	1,642,721,000	1,518,357,000
Sales to AEP Affiliates	401,000	73,576,000	3,753,000	159,888,000
Other Revenues - Affiliated	20,832,000	27,322,000	70,821,000	89,962,000
Other Revenues	749,000	514,000	1,298,000	3,552,000
TOTAL REVENUES	542,863,000	638,865,000	1,718,593,000	1,771,759,000
Expenses
Fuel and Other Consumables Used for Electric Generation	117,414,000	140,193,000	387,757,000	330,088,000
Purchased Electricity for Resale	20,019,000	32,976,000	52,467,000	111,602,000
Purchased Electricity from AEP Affiliates	66,561,000	116,511,000	203,807,000	317,434,000
Other Operation	144,331,000	136,702,000	431,953,000	414,418,000
Maintenance	59,043,000	43,448,000	161,854,000	139,200,000
Depreciation and Amortization	50,585,000	45,393,000	150,062,000	131,991,000
Taxes Other Than Income Taxes	22,059,000	21,278,000	64,685,000	65,899,000
TOTAL EXPENSES	480,012,000	536,501,000	1,452,585,000	1,510,632,000
OPERATING INCOME (LOSS)	62,851,000	102,364,000	266,008,000	261,127,000
Other Income (Expense):
Interest Income	1,450,000	2,360,000	4,228,000	7,077,000
Allowance for Equity Funds Used During Construction	5,596,000	5,041,000	14,364,000	15,568,000
Interest Expense	(22,617,000)	(23,932,000)	(71,955,000)	(72,579,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	47,280,000	85,833,000	212,645,000	211,193,000
Income Tax Expense (Credit)	20,654,000	27,953,000	71,596,000	69,102,000
NET INCOME (LOSS)	26,626,000	57,880,000	141,049,000	142,091,000
Ohio Power Co [Member]
Revenues
Transmission and Distribution Utilities	793,900,000	959,816,000	2,380,768,000	2,710,990,000
Sales to AEP Affiliates	43,733,000	313,818,000	120,154,000	873,850,000
Other Revenues - Affiliated	0	2,715,000	0	18,138,000
Other Revenues	1,564,000	2,827,000	4,628,000	12,982,000
TOTAL REVENUES	839,197,000	1,279,176,000	2,505,550,000	3,615,960,000
Expenses
Fuel and Other Consumables Used for Electric Generation	0	396,437,000	0	1,158,389,000
Purchased Electricity for Resale	48,541,000	34,568,000	191,730,000	114,911,000
Purchased Electricity from AEP Affiliates	315,903,000	103,869,000	897,658,000	257,540,000
Amortization of Generation Deferrals	26,655,000	0	82,818,000	0
Other Operation	145,163,000	159,965,000	428,074,000	481,417,000
Maintenance	53,724,000	71,670,000	136,965,000	218,962,000
Asset Impairments and Other Related Charges	0	0	0	154,304,000
Depreciation and Amortization	54,968,000	94,802,000	165,152,000	289,472,000
Taxes Other Than Income Taxes	89,564,000	105,070,000	268,734,000	310,285,000
TOTAL EXPENSES	734,518,000	966,381,000	2,171,131,000	2,985,280,000
OPERATING INCOME (LOSS)	104,679,000	312,795,000	334,419,000	630,680,000
Other Income (Expense):
Interest Income	1,986,000	476,000	8,159,000	3,165,000
Carrying Costs Income	5,606,000	2,813,000	19,594,000	9,833,000
Allowance for Equity Funds Used During Construction	1,825,000	1,028,000	4,893,000	2,853,000
Interest Expense	(31,171,000)	(45,070,000)	(96,937,000)	(142,487,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	82,925,000	272,042,000	270,128,000	504,044,000
Income Tax Expense (Credit)	28,865,000	93,141,000	98,759,000	174,313,000
NET INCOME (LOSS)	54,060,000	178,901,000	171,369,000	329,731,000
Public Service Co Of Oklahoma [Member]
Revenues
Vertically Integrated Utilities	415,193,000	408,803,000	1,028,427,000	986,008,000
Sales to AEP Affiliates	789,000	1,659,000	6,240,000	9,186,000
Other Revenues	1,009,000	621,000	2,524,000	2,865,000
TOTAL REVENUES	416,991,000	411,083,000	1,037,191,000	998,059,000
Expenses
Fuel and Other Consumables Used for Electric Generation	85,018,000	124,763,000	192,567,000	254,314,000
Purchased Electricity for Resale	117,521,000	55,915,000	301,816,000	179,405,000
Purchased Electricity from AEP Affiliates	0	13,129,000	11,024,000	30,168,000
Other Operation	71,605,000	60,566,000	193,101,000	162,032,000
Maintenance	21,800,000	25,071,000	76,223,000	78,396,000
Depreciation and Amortization	24,496,000	24,191,000	73,085,000	72,449,000
Taxes Other Than Income Taxes	9,137,000	11,616,000	27,757,000	33,440,000
TOTAL EXPENSES	329,577,000	315,251,000	875,573,000	810,204,000
OPERATING INCOME (LOSS)	87,414,000	95,832,000	161,618,000	187,855,000
Other Income (Expense):
Interest Income	137,000	25,000	138,000	1,146,000
Carrying Costs Income	0	21,000	0	338,000
Allowance for Equity Funds Used During Construction	194,000	852,000	2,215,000	2,676,000
Interest Expense	(13,913,000)	(13,417,000)	(41,009,000)	(40,016,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	73,832,000	83,313,000	122,962,000	151,999,000
Income Tax Expense (Credit)	28,746,000	32,217,000	46,979,000	58,778,000
NET INCOME (LOSS)	45,086,000	51,096,000	75,983,000	93,221,000
Southwestern Electric Power Co [Member]
Revenues
Vertically Integrated Utilities	526,047,000	534,196,000	1,397,326,000	1,324,325,000
Sales to AEP Affiliates	5,203,000	18,296,000	22,748,000	41,935,000
Other Revenues	521,000	441,000	1,570,000	1,163,000
TOTAL REVENUES	531,771,000	552,933,000	1,421,644,000	1,367,423,000
Expenses
Fuel and Other Consumables Used for Electric Generation	194,175,000	202,024,000	500,878,000	490,447,000
Purchased Electricity for Resale	36,960,000	37,505,000	138,380,000	120,273,000
Purchased Electricity from AEP Affiliates	0	815,000	3,766,000	6,757,000
Other Operation	68,601,000	62,108,000	206,442,000	182,351,000
Maintenance	29,867,000	24,654,000	93,946,000	84,725,000
Asset Impairments and Other Related Charges	0	110,850,000	0	110,850,000
Depreciation and Amortization	46,791,000	41,846,000	138,316,000	132,460,000
Taxes Other Than Income Taxes	22,246,000	20,772,000	63,272,000	59,530,000
TOTAL EXPENSES	398,640,000	500,574,000	1,145,000,000	1,187,393,000
OPERATING INCOME (LOSS)	133,131,000	52,359,000	276,644,000	180,030,000
Other Income (Expense):
Allowance for Equity Funds Used During Construction			7,415,000	4,872,000
Other Income	3,367,000	2,457,000	7,737,000	5,048,000
Interest Expense	(31,644,000)	(32,614,000)	(95,258,000)	(100,151,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	104,854,000	22,202,000	189,123,000	84,927,000
Income Tax Expense (Credit)	31,042,000	14,935,000	60,252,000	37,057,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	735,000	653,000	1,461,000	1,825,000
NET INCOME (LOSS)	74,547,000	7,920,000	130,332,000	49,695,000
Net Income Attributable to Noncontrolling Interests	1,109,000	1,058,000	3,337,000	3,204,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 73,438,000	$ 6,862,000	$ 126,995,000	$ 46,491,000