Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Vertically Integrated Utilities	$ 2,236,000,000	$ 2,176,000,000	$ 4,785,000,000	$ 4,532,000,000
Transmission and Distribution Utilities	1,064,000,000	1,019,000,000	2,225,000,000	2,109,000,000
Generation & Marketing	573,000,000	298,000,000	1,394,000,000	556,000,000
Other Revenues	171,000,000	89,000,000	288,000,000	211,000,000
TOTAL REVENUES	4,044,000,000	3,582,000,000	8,692,000,000	7,408,000,000
Expenses
Fuel and Other Consumables Used for Electric Generation	1,043,000,000	908,000,000	2,211,000,000	1,939,000,000
Purchased Electricity for Resale	473,000,000	359,000,000	1,111,000,000	730,000,000
Other Operation	760,000,000	664,000,000	1,540,000,000	1,402,000,000
Maintenance	340,000,000	285,000,000	632,000,000	578,000,000
Asset Impairments and Other Related Charges	0	154,000,000	0	154,000,000
Depreciation and Amortization	443,000,000	443,000,000	934,000,000	863,000,000
Taxes Other Than Income Taxes	218,000,000	222,000,000	456,000,000	440,000,000
TOTAL EXPENSES	3,277,000,000	3,035,000,000	6,884,000,000	6,106,000,000
OPERATING INCOME (LOSS)	767,000,000	547,000,000	1,808,000,000	1,302,000,000
Other Income (Expense):
Interest and Investment Income	3,000,000	49,000,000	4,000,000	52,000,000
Carrying Costs Income	9,000,000	8,000,000	15,000,000	12,000,000
Allowance for Equity Funds Used During Construction	25,000,000	17,000,000	47,000,000	32,000,000
Interest Expense	(221,000,000)	(228,000,000)	(441,000,000)	(460,000,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	583,000,000	393,000,000	1,433,000,000	938,000,000
Income Tax Expense (Credit)	215,000,000	68,000,000	522,000,000	263,000,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	23,000,000	14,000,000	41,000,000	28,000,000
NET INCOME (LOSS)	391,000,000	339,000,000	952,000,000	703,000,000
Net Income Attributable to Noncontrolling Interests	1,000,000	1,000,000	2,000,000	2,000,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	390,000,000	338,000,000	950,000,000	701,000,000
Earnings Per Share
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING	488,291,576	486,293,026	488,080,505	486,059,643
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 0.80	$ 0.69	$ 1.95	$ 1.44
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING	488,538,227	486,763,615	488,405,869	486,555,121
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 0.80	$ 0.69	$ 1.95	$ 1.44
CASH DIVIDENDS DECLARED PER SHARE	$ 0.5	$ 0.49	$ 1	$ 0.96
Appalachian Power Co [Member]
Revenues
Vertically Integrated Utilities	664,051,000	670,249,000	1,530,508,000	1,542,981,000
Sales to AEP Affiliates	28,070,000	73,893,000	72,984,000	150,753,000
Other Revenues	2,547,000	2,362,000	4,567,000	4,264,000
TOTAL REVENUES	694,668,000	746,504,000	1,608,059,000	1,697,998,000
Expenses
Fuel and Other Consumables Used for Electric Generation	202,903,000	163,521,000	433,640,000	368,460,000
Purchased Electricity for Resale	86,033,000	59,487,000	255,024,000	124,943,000
Purchased Electricity from AEP Affiliates	0	181,856,000	4,662,000	404,798,000
Other Operation	99,896,000	79,764,000	193,434,000	158,672,000
Maintenance	69,484,000	58,560,000	129,574,000	157,946,000
Depreciation and Amortization	95,650,000	83,240,000	200,236,000	171,143,000
Taxes Other Than Income Taxes	30,025,000	28,004,000	60,802,000	55,404,000
TOTAL EXPENSES	583,991,000	654,432,000	1,277,372,000	1,441,366,000
OPERATING INCOME (LOSS)	110,677,000	92,072,000	330,687,000	256,632,000
Other Income (Expense):
Interest Income	389,000	1,469,000	790,000	1,800,000
Carrying Costs Income	263,000	3,133,000	(1,612,000)	3,236,000
Allowance for Equity Funds Used During Construction	1,625,000	1,213,000	2,860,000	1,983,000
Interest Expense	(53,130,000)	(48,128,000)	(104,802,000)	(96,332,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	59,824,000	49,759,000	227,923,000	167,319,000
Income Tax Expense (Credit)	23,577,000	19,897,000	89,825,000	66,909,000
NET INCOME (LOSS)	36,247,000	29,862,000	138,098,000	100,410,000
Indiana Michigan Power Co [Member]
Revenues
Vertically Integrated Utilities	506,997,000	490,301,000	1,121,840,000	980,904,000
Sales to AEP Affiliates	1,068,000	31,335,000	3,352,000	86,312,000
Other Revenues - Affiliated	25,262,000	26,815,000	49,989,000	62,640,000
Other Revenues	549,000	1,050,000	549,000	3,038,000
TOTAL REVENUES	533,876,000	549,501,000	1,175,730,000	1,132,894,000
Expenses
Fuel and Other Consumables Used for Electric Generation	113,700,000	85,030,000	270,343,000	189,895,000
Purchased Electricity for Resale	27,086,000	36,814,000	32,448,000	78,626,000
Purchased Electricity from AEP Affiliates	65,190,000	99,547,000	137,246,000	200,923,000
Other Operation	146,272,000	132,478,000	287,622,000	277,716,000
Maintenance	54,246,000	50,238,000	102,811,000	95,752,000
Depreciation and Amortization	49,446,000	45,696,000	99,477,000	86,598,000
Taxes Other Than Income Taxes	20,803,000	22,165,000	42,626,000	44,621,000
TOTAL EXPENSES	476,743,000	471,968,000	972,573,000	974,131,000
OPERATING INCOME (LOSS)	57,133,000	77,533,000	203,157,000	158,763,000
Other Income (Expense):
Interest Income	1,729,000	2,662,000	2,778,000	4,717,000
Allowance for Equity Funds Used During Construction	4,804,000	4,881,000	8,768,000	10,527,000
Interest Expense	(23,705,000)	(24,436,000)	(49,338,000)	(48,647,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	39,961,000	60,640,000	165,365,000	125,360,000
Income Tax Expense (Credit)	12,627,000	19,886,000	50,942,000	41,149,000
NET INCOME (LOSS)	27,334,000	40,754,000	114,423,000	84,211,000
Ohio Power Co [Member]
Revenues
Transmission and Distribution Utilities	739,962,000	817,493,000	1,586,868,000	1,751,174,000
Sales to AEP Affiliates	44,443,000	274,390,000	76,421,000	560,032,000
Other Revenues - Affiliated	0	7,583,000	0	15,423,000
Other Revenues	1,756,000	3,528,000	3,064,000	10,155,000
TOTAL REVENUES	786,161,000	1,102,994,000	1,666,353,000	2,336,784,000
Expenses
Fuel and Other Consumables Used for Electric Generation	0	352,368,000	0	761,952,000
Purchased Electricity for Resale	64,059,000	37,158,000	143,189,000	80,343,000
Purchased Electricity from AEP Affiliates	267,631,000	73,290,000	581,755,000	153,671,000
Amortization of Generation Deferrals	24,977,000	0	56,163,000	0
Other Operation	131,485,000	137,265,000	282,911,000	321,452,000
Maintenance	48,590,000	72,997,000	83,241,000	147,292,000
Asset Impairments and Other Related Charges	0	154,304,000	0	154,304,000
Depreciation and Amortization	51,485,000	102,346,000	110,184,000	194,670,000
Taxes Other Than Income Taxes	83,913,000	100,194,000	179,170,000	205,215,000
TOTAL EXPENSES	672,140,000	1,029,922,000	1,436,613,000	2,018,899,000
OPERATING INCOME (LOSS)	114,021,000	73,072,000	229,740,000	317,885,000
Other Income (Expense):
Interest Income	2,899,000	2,326,000	6,173,000	2,689,000
Carrying Costs Income	6,874,000	3,757,000	13,988,000	7,020,000
Allowance for Equity Funds Used During Construction	1,342,000	521,000	3,068,000	1,825,000
Interest Expense	(32,759,000)	(47,244,000)	(65,766,000)	(97,417,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	92,377,000	32,432,000	187,203,000	232,002,000
Income Tax Expense (Credit)	35,842,000	11,376,000	69,894,000	81,172,000
NET INCOME (LOSS)	56,535,000	21,056,000	117,309,000	150,830,000
Public Service Co Of Oklahoma [Member]
Revenues
Vertically Integrated Utilities	316,524,000	317,302,000	613,234,000	577,205,000
Sales to AEP Affiliates	854,000	5,693,000	5,451,000	7,527,000
Other Revenues	1,437,000	1,692,000	1,515,000	2,244,000
TOTAL REVENUES	318,815,000	324,687,000	620,200,000	586,976,000
Expenses
Fuel and Other Consumables Used for Electric Generation	41,612,000	86,241,000	107,549,000	129,551,000
Purchased Electricity for Resale	104,604,000	58,835,000	184,295,000	123,490,000
Purchased Electricity from AEP Affiliates	0	6,823,000	11,024,000	17,039,000
Other Operation	62,785,000	53,659,000	121,496,000	101,466,000
Maintenance	29,678,000	24,753,000	54,423,000	53,325,000
Depreciation and Amortization	24,607,000	24,078,000	48,589,000	48,258,000
Taxes Other Than Income Taxes	6,651,000	11,827,000	18,620,000	21,824,000
TOTAL EXPENSES	269,937,000	266,216,000	545,996,000	494,953,000
OPERATING INCOME (LOSS)	48,878,000	58,471,000	74,204,000	92,023,000
Other Income (Expense):
Interest Income	4,000	193,000	1,000	1,121,000
Carrying Costs Income	0	110,000	0	317,000
Allowance for Equity Funds Used During Construction	590,000	844,000	2,021,000	1,824,000
Interest Expense	(13,779,000)	(13,259,000)	(27,096,000)	(26,599,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	35,693,000	46,359,000	49,130,000	68,686,000
Income Tax Expense (Credit)	13,244,000	17,927,000	18,233,000	26,561,000
NET INCOME (LOSS)	22,449,000	28,432,000	30,897,000	42,125,000
Southwestern Electric Power Co [Member]
Revenues
Vertically Integrated Utilities	444,652,000	408,852,000	871,279,000	790,129,000
Sales to AEP Affiliates	3,947,000	10,930,000	17,545,000	23,639,000
Other Revenues	684,000	391,000	1,049,000	722,000
TOTAL REVENUES	449,283,000	420,173,000	889,873,000	814,490,000
Expenses
Fuel and Other Consumables Used for Electric Generation	161,116,000	137,065,000	306,703,000	288,423,000
Purchased Electricity for Resale	40,255,000	43,008,000	101,420,000	82,768,000
Purchased Electricity from AEP Affiliates	0	4,925,000	3,766,000	5,942,000
Other Operation	69,304,000	60,795,000	137,841,000	120,243,000
Maintenance	33,668,000	32,280,000	64,079,000	60,071,000
Depreciation and Amortization	45,864,000	45,732,000	91,525,000	90,614,000
Taxes Other Than Income Taxes	20,289,000	19,336,000	41,026,000	38,758,000
TOTAL EXPENSES	370,496,000	343,141,000	746,360,000	686,819,000
OPERATING INCOME (LOSS)	78,787,000	77,032,000	143,513,000	127,671,000
Other Income (Expense):
Interest Income	206,000	169,000	92,000	199,000
Allowance for Equity Funds Used During Construction	2,197,000	1,368,000	4,278,000	2,392,000
Interest Expense	(31,738,000)	(33,547,000)	(63,614,000)	(67,537,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	49,452,000	45,022,000	84,269,000	62,725,000
Income Tax Expense (Credit)	17,045,000	15,326,000	29,210,000	22,122,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	416,000	531,000	726,000	1,172,000
NET INCOME (LOSS)	32,823,000	30,227,000	55,785,000	41,775,000
Net Income Attributable to Noncontrolling Interests	1,126,000	1,056,000	2,228,000	2,146,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 31,697,000	$ 29,171,000	$ 53,557,000	$ 39,629,000