Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Utility Operations	$ 3,253,000,000	$ 3,235,000,000	$ 6,742,000,000	$ 6,598,000,000
Other Revenues	329,000,000	316,000,000	666,000,000	578,000,000
TOTAL REVENUES	3,582,000,000	3,551,000,000	7,408,000,000	7,176,000,000
Expenses
Fuel and Other Consumables Used for Electric Generation	908,000,000	904,000,000	1,939,000,000	1,957,000,000
Purchased Electricity for Resale	359,000,000	268,000,000	730,000,000	528,000,000
Other Operation	664,000,000	719,000,000	1,402,000,000	1,375,000,000
Maintenance	285,000,000	252,000,000	578,000,000	514,000,000
Asset Impairments and Other Related Charges	154,000,000	0	154,000,000	0
Depreciation and Amortization	443,000,000	460,000,000	863,000,000	883,000,000
Taxes Other Than Income Taxes	222,000,000	207,000,000	440,000,000	424,000,000
TOTAL EXPENSES	3,035,000,000	2,810,000,000	6,106,000,000	5,681,000,000
OPERATING INCOME (LOSS)	547,000,000	741,000,000	1,302,000,000	1,495,000,000
Other Income (Expense):
Interest and Investment Income	49,000,000	2,000,000	52,000,000	4,000,000
Carrying Costs Income	8,000,000	11,000,000	12,000,000	31,000,000
Allowance for Equity Funds Used During Construction	17,000,000	24,000,000	32,000,000	47,000,000
Interest Expense	(228,000,000)	(235,000,000)	(460,000,000)	(464,000,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	393,000,000	543,000,000	938,000,000	1,113,000,000
Income Tax Expense (Credit)	68,000,000	190,000,000	263,000,000	379,000,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	14,000,000	10,000,000	28,000,000	19,000,000
NET INCOME (LOSS)	339,000,000	363,000,000	703,000,000	753,000,000
Net Income Attributable to Noncontrolling Interests	1,000,000	1,000,000	2,000,000	2,000,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	338,000,000	362,000,000	701,000,000	751,000,000
Earnings Per Share
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING	486,293,026	484,500,029	486,059,643	484,164,065
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 0.69	$ 0.75	$ 1.44	$ 1.55
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING	486,763,615	484,860,690	486,555,121	484,554,779
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 0.69	$ 0.75	$ 1.44	$ 1.55
CASH DIVIDENDS DECLARED PER SHARE	$ 0.49	$ 0.47	$ 0.96	$ 0.94
Appalachian Power Co [Member]
Revenues
Utility Operations	670,249,000	647,236,000	1,542,981,000	1,385,835,000
Sales to AEP Affiliates	73,893,000	67,043,000	150,753,000	131,344,000
Other Revenues	2,362,000	2,182,000	4,264,000	4,758,000
TOTAL REVENUES	746,504,000	716,461,000	1,697,998,000	1,521,937,000
Expenses
Fuel and Other Consumables Used for Electric Generation	163,521,000	181,653,000	368,460,000	368,537,000
Purchased Electricity for Resale	59,487,000	44,869,000	124,943,000	110,225,000
Purchased Electricity from AEP Affiliates	181,856,000	125,864,000	404,798,000	281,881,000
Other Operation	79,764,000	72,685,000	158,672,000	147,004,000
Maintenance	58,560,000	37,830,000	157,946,000	84,165,000
Depreciation and Amortization	83,240,000	85,139,000	171,143,000	165,552,000
Taxes Other Than Income Taxes	28,004,000	24,995,000	55,404,000	51,957,000
TOTAL EXPENSES	654,432,000	573,035,000	1,441,366,000	1,209,321,000
OPERATING INCOME (LOSS)	92,072,000	143,426,000	256,632,000	312,616,000
Other Income (Expense):
Interest Income	1,469,000	359,000	1,800,000	702,000
Carrying Costs Income	3,133,000	5,467,000	3,236,000	13,252,000
Allowance for Equity Funds Used During Construction	1,213,000	4,000	1,983,000	517,000
Interest Expense	(48,128,000)	(51,945,000)	(96,332,000)	(103,252,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	49,759,000	97,311,000	167,319,000	223,835,000
Income Tax Expense (Credit)	19,897,000	34,979,000	66,909,000	86,192,000
NET INCOME (LOSS)	29,862,000	62,332,000	100,410,000	137,643,000
Indiana Michigan Power Co [Member]
Revenues
Utility Operations	490,301,000	435,965,000	980,904,000	871,992,000
Sales to AEP Affiliates	31,335,000	45,728,000	86,312,000	121,643,000
Other Revenues - Affiliated	26,815,000	29,052,000	62,640,000	59,763,000
Other Revenues	1,050,000	131,000	3,038,000	3,685,000
TOTAL REVENUES	549,501,000	510,876,000	1,132,894,000	1,057,083,000
Expenses
Fuel and Other Consumables Used for Electric Generation	85,030,000	96,715,000	189,895,000	209,085,000
Purchased Electricity for Resale	36,814,000	29,488,000	78,626,000	65,398,000
Purchased Electricity from AEP Affiliates	99,547,000	82,188,000	200,923,000	170,141,000
Other Operation	132,478,000	134,274,000	277,716,000	269,490,000
Maintenance	50,238,000	47,244,000	95,752,000	89,509,000
Depreciation and Amortization	45,696,000	37,560,000	86,598,000	71,539,000
Taxes Other Than Income Taxes	22,165,000	18,604,000	44,621,000	40,793,000
TOTAL EXPENSES	471,968,000	446,073,000	974,131,000	915,955,000
OPERATING INCOME (LOSS)	77,533,000	64,803,000	158,763,000	141,128,000
Other Income (Expense):
Interest Income	2,662,000	524,000	4,717,000	1,775,000
Allowance for Equity Funds Used During Construction	4,881,000	2,324,000	10,527,000	5,335,000
Interest Expense	(24,436,000)	(25,373,000)	(48,647,000)	(50,426,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	60,640,000	42,278,000	125,360,000	97,812,000
Income Tax Expense (Credit)	19,886,000	12,468,000	41,149,000	28,781,000
NET INCOME (LOSS)	40,754,000	29,810,000	84,211,000	69,031,000
Ohio Power Co [Member]
Revenues
Utility Operations	817,493,000	929,487,000	1,751,174,000	1,970,318,000
Sales to AEP Affiliates	274,390,000	172,561,000	560,032,000	354,318,000
Other Revenues - Affiliated	7,583,000	7,979,000	15,423,000	17,090,000
Other Revenues	3,528,000	3,723,000	10,155,000	9,247,000
TOTAL REVENUES	1,102,994,000	1,113,750,000	2,336,784,000	2,350,973,000
Expenses
Fuel and Other Consumables Used for Electric Generation	352,368,000	298,294,000	761,952,000	668,287,000
Purchased Electricity for Resale	37,158,000	52,104,000	80,343,000	110,238,000
Purchased Electricity from AEP Affiliates	73,290,000	81,818,000	153,671,000	170,501,000
Other Operation	137,265,000	162,086,000	321,452,000	292,428,000
Maintenance	72,997,000	74,015,000	147,292,000	154,619,000
Asset Impairments and Other Related Charges	154,304,000	0	154,304,000	0
Depreciation and Amortization	102,346,000	137,009,000	194,670,000	271,439,000
Taxes Other Than Income Taxes	100,194,000	98,420,000	205,215,000	203,838,000
TOTAL EXPENSES	1,029,922,000	903,746,000	2,018,899,000	1,871,350,000
OPERATING INCOME (LOSS)	73,072,000	210,004,000	317,885,000	479,623,000
Other Income (Expense):
Interest Income	2,326,000	345,000	2,689,000	1,443,000
Carrying Costs Income	3,757,000	4,511,000	7,020,000	7,269,000
Allowance for Equity Funds Used During Construction	521,000	915,000	1,825,000	2,038,000
Interest Expense	(47,244,000)	(53,147,000)	(97,417,000)	(107,408,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	32,432,000	162,628,000	232,002,000	382,965,000
Income Tax Expense (Credit)	11,376,000	61,205,000	81,172,000	130,712,000
NET INCOME (LOSS)	21,056,000	101,423,000	150,830,000	252,253,000
Public Service Co Of Oklahoma [Member]
Revenues
Utility Operations	317,302,000	311,310,000	577,205,000	603,832,000
Sales to AEP Affiliates	5,693,000	5,407,000	7,527,000	12,512,000
Other Revenues	1,692,000	594,000	2,244,000	1,498,000
TOTAL REVENUES	324,687,000	317,311,000	586,976,000	617,842,000
Expenses
Fuel and Other Consumables Used for Electric Generation	86,241,000	91,126,000	129,551,000	216,551,000
Purchased Electricity for Resale	58,835,000	44,822,000	123,490,000	70,264,000
Purchased Electricity from AEP Affiliates	6,823,000	4,260,000	17,039,000	10,458,000
Other Operation	53,659,000	48,880,000	101,466,000	95,859,000
Maintenance	24,753,000	24,853,000	53,325,000	53,178,000
Depreciation and Amortization	24,078,000	23,390,000	48,258,000	46,923,000
Taxes Other Than Income Taxes	11,827,000	10,681,000	21,824,000	21,820,000
TOTAL EXPENSES	266,216,000	248,012,000	494,953,000	515,053,000
OPERATING INCOME (LOSS)	58,471,000	69,299,000	92,023,000	102,789,000
Other Income (Expense):
Interest Income	193,000	97,000	1,121,000	1,032,000
Carrying Costs Income	110,000	529,000	317,000	1,142,000
Allowance for Equity Funds Used During Construction	844,000	468,000	1,824,000	890,000
Interest Expense	(13,259,000)	(13,766,000)	(26,599,000)	(28,477,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	46,359,000	56,627,000	68,686,000	77,376,000
Income Tax Expense (Credit)	17,927,000	21,416,000	26,561,000	29,517,000
NET INCOME (LOSS)	28,432,000	35,211,000	42,125,000	47,859,000
Southwestern Electric Power Co [Member]
Revenues
Utility Operations	408,852,000	383,659,000	790,129,000	723,362,000
Sales to AEP Affiliates	10,930,000	6,890,000	23,639,000	15,847,000
Other Revenues	391,000	397,000	722,000	723,000
TOTAL REVENUES	420,173,000	390,946,000	814,490,000	739,932,000
Expenses
Fuel and Other Consumables Used for Electric Generation	137,065,000	138,008,000	288,423,000	266,242,000
Purchased Electricity for Resale	43,008,000	26,574,000	82,768,000	62,041,000
Purchased Electricity from AEP Affiliates	4,925,000	4,589,000	5,942,000	10,844,000
Other Operation	60,795,000	54,067,000	120,243,000	105,660,000
Maintenance	32,280,000	29,757,000	60,071,000	51,019,000
Asset Impairments and Other Related Charges	0	13,000,000	0	13,000,000
Depreciation and Amortization	45,732,000	34,655,000	90,614,000	68,676,000
Taxes Other Than Income Taxes	19,336,000	17,320,000	38,758,000	34,106,000
TOTAL EXPENSES	343,141,000	317,970,000	686,819,000	611,588,000
OPERATING INCOME (LOSS)	77,032,000	72,976,000	127,671,000	128,344,000
Other Income (Expense):
Interest Income	169,000	11,000	199,000	1,132,000
Allowance for Equity Funds Used During Construction	1,368,000	14,412,000	2,392,000	28,185,000
Interest Expense	(33,547,000)	(21,710,000)	(67,537,000)	(43,712,000)
INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	45,022,000	65,689,000	62,725,000	113,949,000
Income Tax Expense (Credit)	15,326,000	11,505,000	22,122,000	23,977,000
Equity Earnings (Loss) of Unconsolidated Subsidiaries	531,000	718,000	1,172,000	1,325,000
NET INCOME (LOSS)	30,227,000	54,902,000	41,775,000	91,297,000
Net Income Attributable to Noncontrolling Interests	1,056,000	1,061,000	2,146,000	2,144,000
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 29,171,000	$ 53,841,000	$ 39,629,000	$ 89,153,000