Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net Income (Loss)	$ 364,000,000	$ 390,000,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	420,000,000	423,000,000
Deferred Income Taxes	246,000,000	261,000,000
Carrying Costs Income	(4,000,000)	(20,000,000)
Allowance for Equity Funds Used During Construction	(15,000,000)	(23,000,000)
Mark-to-Market of Risk Management Contracts	34,000,000	10,000,000
Amortization of Nuclear Fuel	34,000,000	34,000,000
Property Taxes	(51,000,000)	(49,000,000)
Fuel Over/Under-Recovery, Net	(4,000,000)	112,000,000
Change in Other Noncurrent Assets	(13,000,000)	(59,000,000)
Change in Other Noncurrent Liabilities	17,000,000	(47,000,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(4,000,000)	207,000,000
Fuel, Materials and Supplies	(1,000,000)	(126,000,000)
Accounts Payable	(3,000,000)	(26,000,000)
Accrued Taxes, Net	(69,000,000)	(30,000,000)
Other Current Assets	(16,000,000)	(15,000,000)
Other Current Liabilities	(179,000,000)	(166,000,000)
Net Cash Flows from (Used for) Operating Activities	756,000,000	876,000,000
Investing Activities
Construction Expenditures	(843,000,000)	(741,000,000)
Change in Other Temporary Investments, Net	75,000,000	79,000,000
Purchases of Investment Securities	(196,000,000)	(353,000,000)
Sales of Investment Securities	168,000,000	334,000,000
Acquisitions of Nuclear Fuel	(47,000,000)	(11,000,000)
Acquisitions of Assets/Businesses	(2,000,000)	(85,000,000)
Insurance Proceeds Related to Cook Plant Fire	72,000,000	0
Proceeds from Sales of Assets	1,000,000	8,000,000
Other Investing Activities	0	(23,000,000)
Net Cash Flows from (Used for) Investing Activities	(772,000,000)	(792,000,000)
Financing Activities
Issuance of Common Stock, Net	15,000,000	31,000,000
Issuance of Long-term Debt	671,000,000	1,132,000,000
Credit Facility Borrowings	17,000,000	21,000,000
Change in Short-term Debt, Net	329,000,000	(583,000,000)
Retirement of Long-term Debt	(858,000,000)	(339,000,000)
Credit Facility Repayments	(20,000,000)	(38,000,000)
Principal Payments for Capital Lease Obligations	(16,000,000)	(18,000,000)
Dividends Paid on Common Stock	(230,000,000)	(229,000,000)
Other Financing Activities	8,000,000	4,000,000
Net Cash Flows from (Used for) Financing Activities	(84,000,000)	(19,000,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(100,000,000)	65,000,000
Cash and Cash Equivalents at Beginning of Period	279,000,000	221,000,000
Cash and Cash Equivalents at End of Period	179,000,000	286,000,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	253,000,000	265,000,000
Net Cash Paid (Received) for Income Taxes	(19,000,000)	(65,000,000)
Noncash Acquisitions Under Capital Leases	24,000,000	20,000,000
Construction Expenditures Included in Current Liabilities as of March 31,	300,000,000	250,000,000
Noncash Assumption of Liabilities Related to Acquisitions	0	56,000,000
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	70,548,000	75,311,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	87,903,000	80,413,000
Deferred Income Taxes	17,185,000	27,343,000
Carrying Costs Income	(103,000)	(7,785,000)
Allowance for Equity Funds Used During Construction	(770,000)	(513,000)
Mark-to-Market of Risk Management Contracts	9,404,000	(2,426,000)
Fuel Over/Under-Recovery, Net	20,135,000	24,741,000
Change in Other Noncurrent Assets	28,314,000	(11,020,000)
Change in Other Noncurrent Liabilities	5,634,000	8,866,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	7,238,000	100,202,000
Fuel, Materials and Supplies	(8,726,000)	(45,137,000)
Accounts Payable	(20,597,000)	(24,787,000)
Accrued Taxes, Net	30,197,000	22,142,000
Other Current Assets	642,000	(269,000)
Other Current Liabilities	(10,917,000)	(16,921,000)
Net Cash Flows from (Used for) Operating Activities	236,087,000	230,160,000
Investing Activities
Construction Expenditures	(110,552,000)	(117,359,000)
Change in Advances to Affiliates, Net	(179,000)	(398,000)
Other Investing Activities	(179,000)	2,295,000
Net Cash Flows from (Used for) Investing Activities	(110,910,000)	(115,462,000)
Financing Activities
Issuance of Long-term Debt	(258,000)	0
Change in Advances from Affiliates, Net	(77,314,000)	(14,208,000)
Retirement of Long-term Debt	(7,000)	(49,506,000)
Principal Payments for Capital Lease Obligations	(1,238,000)	(1,637,000)
Dividends Paid on Common Stock	(50,000,000)	(50,000,000)
Other Financing Activities	1,320,000	139,000
Net Cash Flows from (Used for) Financing Activities	(127,497,000)	(115,212,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(2,320,000)	(514,000)
Cash and Cash Equivalents at Beginning of Period	3,576,000	2,317,000
Cash and Cash Equivalents at End of Period	1,256,000	1,803,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	31,018,000	46,159,000
Net Cash Paid (Received) for Income Taxes	231,000	(2,984,000)
Noncash Acquisitions Under Capital Leases	1,548,000	1,037,000
Construction Expenditures Included in Current Liabilities as of March 31,	35,733,000	30,998,000
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	43,457,000	39,221,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	40,902,000	33,979,000
Deferred Income Taxes	26,791,000	26,638,000
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	(5,840,000)	(4,878,000)
Allowance for Equity Funds Used During Construction	(5,646,000)	(3,011,000)
Mark-to-Market of Risk Management Contracts	9,238,000	(5,624,000)
Amortization of Nuclear Fuel	34,000,000	33,585,000
Fuel Over/Under-Recovery, Net	417,000	(3,493,000)
Change in Other Noncurrent Assets	(9,217,000)	(9,931,000)
Change in Other Noncurrent Liabilities	8,577,000	32,710,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	22,531,000	49,885,000
Fuel, Materials and Supplies	(6,868,000)	(13,890,000)
Accounts Payable	(31,801,000)	(4,269,000)
Accrued Taxes, Net	14,198,000	30,624,000
Other Current Assets	8,487,000	(6,197,000)
Other Current Liabilities	(13,443,000)	(23,279,000)
Net Cash Flows from (Used for) Operating Activities	135,783,000	172,070,000
Investing Activities
Construction Expenditures	(153,262,000)	(72,867,000)
Change in Advances to Affiliates, Net	(205,008,000)	(48,248,000)
Purchases of Investment Securities	(184,299,000)	(352,877,000)
Sales of Investment Securities	167,670,000	334,400,000
Acquisitions of Nuclear Fuel	(46,739,000)	(10,936,000)
Insurance Proceeds Related to Cook Plant Fire	72,000,000	0
Other Investing Activities	3,077,000	8,745,000
Net Cash Flows from (Used for) Investing Activities	(346,561,000)	(141,783,000)
Financing Activities
Issuance of Long-term Debt	247,771,000	0
Retirement of Long-term Debt	(24,864,000)	(16,074,000)
Principal Payments for Capital Lease Obligations	(1,265,000)	(1,890,000)
Dividends Paid on Common Stock	(12,500,000)	(12,500,000)
Other Financing Activities	646,000	(200,000)
Net Cash Flows from (Used for) Financing Activities	209,788,000	(30,664,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(990,000)	(377,000)
Cash and Cash Equivalents at Beginning of Period	1,562,000	1,020,000
Cash and Cash Equivalents at End of Period	572,000	643,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	30,116,000	29,398,000
Net Cash Paid (Received) for Income Taxes	(8,007,000)	(23,095,000)
Noncash Acquisitions Under Capital Leases	1,355,000	2,009,000
Construction Expenditures Included in Current Liabilities as of March 31,	42,430,000	26,957,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	1,485,000	0
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	129,774,000	150,830,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	92,324,000	134,430,000
Deferred Income Taxes	55,328,000	47,668,000
Carrying Costs Income	(3,263,000)	(2,758,000)
Allowance for Equity Funds Used During Construction	(1,304,000)	(1,123,000)
Mark-to-Market of Risk Management Contracts	12,901,000	(8,566,000)
Property Taxes	55,246,000	53,973,000
Fuel Over/Under-Recovery, Net	9,191,000	21,222,000
Change in Other Noncurrent Assets	(34,964,000)	(1,649,000)
Change in Other Noncurrent Liabilities	1,730,000	(20,486,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	58,235,000	98,001,000
Fuel, Materials and Supplies	(1,388,000)	(40,200,000)
Accounts Payable	(42,749,000)	(98,502,000)
Accrued Taxes, Net	(91,308,000)	(76,603,000)
Other Current Assets	(705,000)	(2,041,000)
Other Current Liabilities	(21,374,000)	(10,538,000)
Net Cash Flows from (Used for) Operating Activities	217,674,000	243,658,000
Investing Activities
Construction Expenditures	(131,590,000)	(148,956,000)
Change in Advances to Affiliates, Net	106,080,000	129,618,000
Proceeds from Sales of Assets	8,941,000	2,827,000
Other Investing Activities	819,000	(23,000)
Net Cash Flows from (Used for) Investing Activities	(15,750,000)	(16,534,000)
Financing Activities
Issuance of Long-term Debt - Affiliated	200,000,000	0
Change in Advances from Affiliates, Net	172,211,000	0
Retirement of Long-term Debt	(500,000,000)	(150,000,000)
Principal Payments for Capital Lease Obligations	(2,508,000)	(2,619,000)
Dividends Paid on Common Stock	(75,000,000)	(75,000,000)
Other Financing Activities	760,000	109,000
Net Cash Flows from (Used for) Financing Activities	(204,537,000)	(227,510,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(2,613,000)	(386,000)
Cash and Cash Equivalents at Beginning of Period	3,640,000	2,095,000
Cash and Cash Equivalents at End of Period	1,027,000	1,709,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	50,327,000	52,150,000
Net Cash Paid (Received) for Income Taxes	(2,390,000)	(7,359,000)
Noncash Acquisitions Under Capital Leases	1,811,000	819,000
Government Grants Included in Accounts Receivable as of March 31,	1,147,000	2,052,000
Construction Expenditures Included in Current Liabilities as of March 31,	69,152,000	28,330,000
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	13,693,000	12,648,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	24,180,000	23,533,000
Deferred Income Taxes	20,242,000	9,307,000
Carrying Costs Income	(207,000)	(613,000)
Allowance for Equity Funds Used During Construction	(980,000)	(422,000)
Mark-to-Market of Risk Management Contracts	(3,013,000)	4,818,000
Property Taxes	(28,730,000)	(29,020,000)
Fuel Over/Under-Recovery, Net	(17,812,000)	62,075,000
Change in Other Noncurrent Assets	592,000	(3,567,000)
Change in Other Noncurrent Liabilities	4,620,000	(372,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	1,665,000	(15,757,000)
Fuel, Materials and Supplies	1,344,000	1,111,000
Accounts Payable	(5,827,000)	(10,655,000)
Accrued Taxes, Net	6,106,000	15,852,000
Other Current Assets	1,181,000	(564,000)
Other Current Liabilities	10,663,000	(3,542,000)
Net Cash Flows from (Used for) Operating Activities	27,717,000	64,832,000
Investing Activities
Construction Expenditures	(54,298,000)	(62,696,000)
Change in Advances to Affiliates, Net	10,558,000	10,740,000
Other Investing Activities	5,196,000	290,000
Net Cash Flows from (Used for) Investing Activities	(38,544,000)	(51,666,000)
Financing Activities
Issuance of Long-term Debt	0	1,944,000
Change in Advances from Affiliates, Net	24,004,000	0
Retirement of Long-term Debt	(99,000)	0
Principal Payments for Capital Lease Obligations	(754,000)	(841,000)
Dividends Paid on Common Stock	(13,750,000)	(15,000,000)
Other Financing Activities	533,000	106,000
Net Cash Flows from (Used for) Financing Activities	9,934,000	(13,791,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(893,000)	(625,000)
Cash and Cash Equivalents at Beginning of Period	1,367,000	1,413,000
Cash and Cash Equivalents at End of Period	474,000	788,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	10,519,000	10,795,000
Net Cash Paid (Received) for Income Taxes	284,000	4,873,000
Noncash Acquisitions Under Capital Leases	1,015,000	437,000
Construction Expenditures Included in Current Liabilities as of March 31,	19,868,000	9,861,000
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	11,548,000	36,395,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	44,882,000	34,021,000
Deferred Income Taxes	25,583,000	82,540,000
Allowance for Equity Funds Used During Construction	(1,024,000)	(13,774,000)
Mark-to-Market of Risk Management Contracts	(293,000)	4,896,000
Property Taxes	(36,161,000)	(29,686,000)
Fuel Over/Under-Recovery, Net	(7,496,000)	(12,865,000)
Change in Other Noncurrent Assets	(1,245,000)	(4,400,000)
Change in Other Noncurrent Liabilities	4,953,000	(10,862,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	11,654,000	5,732,000
Fuel, Materials and Supplies	3,303,000	(183,000)
Accounts Payable	(12,658,000)	(7,399,000)
Customer Deposits	(14,202,000)	11,406,000
Accrued Taxes, Net	27,994,000	(42,370,000)
Accrued Interest	(25,447,000)	(20,801,000)
Other Current Assets	(638,000)	(8,557,000)
Other Current Liabilities	(13,551,000)	(11,533,000)
Net Cash Flows from (Used for) Operating Activities	17,202,000	12,560,000
Investing Activities
Construction Expenditures	(97,786,000)	(130,344,000)
Change in Advances to Affiliates, Net	126,944,000	(27,651,000)
Other Investing Activities	(1,108,000)	(1,096,000)
Net Cash Flows from (Used for) Investing Activities	28,050,000	(159,091,000)
Financing Activities
Issuance of Long-term Debt	0	336,664,000
Credit Facility Borrowings	17,091,000	20,701,000
Change in Advances from Affiliates, Net	0	(132,473,000)
Retirement of Long-term Debt	(1,625,000)	(20,000,000)
Credit Facility Repayments	(19,694,000)	(37,717,000)
Principal Payments for Capital Lease Obligations	(4,225,000)	(3,726,000)
Dividends Paid on Common Stock	(31,250,000)	0
Dividends Paid on Common Stock	(964,000)	(1,092,000)
Other Financing Activities	522,000	1,405,000
Net Cash Flows from (Used for) Financing Activities	(40,145,000)	163,762,000
Net Increase (Decrease) in Cash and Cash Equivalents	5,107,000	17,231,000
Cash and Cash Equivalents at Beginning of Period	2,036,000	801,000
Cash and Cash Equivalents at End of Period	7,143,000	18,032,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	55,626,000	39,581,000
Net Cash Paid (Received) for Income Taxes	(8,387,000)	1,168,000
Noncash Acquisitions Under Capital Leases	2,454,000	8,396,000
Construction Expenditures Included in Current Liabilities as of March 31,	$ 40,990,000	$ 95,570,000