Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities
Net Income (Loss)	$ 1,638,000,000	$ 1,040,000,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	1,258,000,000	1,237,000,000
Deferred Income Taxes	764,000,000	404,000,000
Gain on Settlement with BOA and Enron	(51,000,000)	0
Settlement of Litigation with BOA and Enron	(211,000,000)	0
Extraordinary Item, Net of Tax	(273,000,000)	0
Asset Impairments and Other Related Charges	90,000,000	0
Carrying Costs Income	(323,000,000)	(51,000,000)
Allowance for Equity Funds Used During Construction	(69,000,000)	(60,000,000)
Mark-to-Market of Risk Management Contracts	84,000,000	(108,000,000)
Amortization of Nuclear Fuel	108,000,000	113,000,000
Pension Contributions to Qualified Plan Trust	(150,000,000)	(463,000,000)
Property Taxes	173,000,000	157,000,000
Fuel Over/Under-Recovery, Net	(94,000,000)	(233,000,000)
Change in Other Noncurrent Assets	(32,000,000)	(50,000,000)
Change in Other Noncurrent Liabilities	225,000,000	183,000,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	51,000,000	(766,000,000)
Fuel, Materials and Supplies	275,000,000	240,000,000
Margin Deposits	26,000,000	3,000,000
Accounts Payable	(66,000,000)	(163,000,000)
Accrued Taxes, Net	(42,000,000)	223,000,000
Accrued Interest	(46,000,000)	(32,000,000)
Other Current Assets	(13,000,000)	35,000,000
Other Current Liabilities	16,000,000	(7,000,000)
Net Cash Flows from (Used for) Operating Activities	3,338,000,000	1,702,000,000
Investing Activities
Construction Expenditures	(1,849,000,000)	(1,629,000,000)
Change in Other Temporary Investments, Net	62,000,000	63,000,000
Purchases of Investment Securities	(1,024,000,000)	(1,542,000,000)
Sales of Investment Securities	1,094,000,000	1,477,000,000
Acquisitions of Nuclear Fuel	(104,000,000)	(69,000,000)
Acquisitions of Assets	(10,000,000)	(16,000,000)
Acquisition of Cushion Gas from BOA	(214,000,000)	0
Proceeds from Sales of Assets	116,000,000	160,000,000
Other Investing Activities	(38,000,000)	(19,000,000)
Net Cash Flows from (Used for) Investing Activities	(1,967,000,000)	(1,575,000,000)
Financing Activities
Issuance of Common Stock, Net	70,000,000	65,000,000
Issuance of Long-term Debt	1,118,000,000	1,201,000,000
Credit Facility Borrowings	462,000,000	195,000,000
Change in Short-term Debt, Net	290,000,000	1,223,000,000
Retirement of Long-term Debt	(1,520,000,000)	(1,454,000,000)
Credit Facility Repayments	(819,000,000)	(78,000,000)
Principal Payments for Capital Lease Obligations	(53,000,000)	(74,000,000)
Dividends Paid on Common Stock	(668,000,000)	(602,000,000)
Dividends Paid on Cumulative Preferred Stock	(2,000,000)	(2,000,000)
Other Financing Activities	3,000,000	(1,000,000)
Net Cash Flows from (Used for) Financing Activities	(1,119,000,000)	473,000,000
Net Increase (Decrease) in Cash and Cash Equivalents	252,000,000	600,000,000
Cash and Cash Equivalents at Beginning of Period	294,000,000	490,000,000
Cash and Cash Equivalents at End of Period	546,000,000	1,090,000,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	716,000,000	755,000,000
Net Cash Paid (Received) for Income Taxes	(119,000,000)	(243,000,000)
Noncash Acquisitions Under Capital Leases	39,000,000	190,000,000
Government Grants Included in Accounts Receivable at September 30,	2,000,000	0
Construction Expenditures Included in Current Liabilities at September 30,	304,000,000	229,000,000
Noncash Increase in Long-Term Debt Through the Fort Wayne Lease Settlement	27,000,000	0
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	123,411,000	100,734,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	205,492,000	227,327,000
Deferred Income Taxes	184,986,000	52,798,000
Carrying Costs Income	(17,560,000)	(23,627,000)
Allowance for Equity Funds Used During Construction	(4,546,000)	(1,727,000)
Mark-to-Market of Risk Management Contracts	13,161,000	(2,573,000)
Pension Contributions to Qualified Plan Trust	(14,700,000)	(31,952,000)
Property Taxes	19,231,000	19,660,000
Fuel Over/Under-Recovery, Net	(20,603,000)	(17,136,000)
Change in Other Noncurrent Assets	(5,856,000)	29,275,000
Change in Other Noncurrent Liabilities	15,714,000	4,558,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	124,404,000	93,787,000
Fuel, Materials and Supplies	132,579,000	132,801,000
Accounts Payable	(72,682,000)	(113,912,000)
Accrued Taxes, Net	(54,214,000)	107,404,000
Other Current Assets	13,023,000	(4,416,000)
Other Current Liabilities	3,984,000	(5,537,000)
Net Cash Flows from (Used for) Operating Activities	645,824,000	567,464,000
Investing Activities
Construction Expenditures	(300,357,000)	(362,792,000)
Change in Advances to Affiliates, Net	(81,825,000)	0
Acquisitions of Assets	(302,217,000)	(9,595,000)
Other Investing Activities	11,885,000	9,141,000
Net Cash Flows from (Used for) Investing Activities	(672,514,000)	(363,246,000)
Financing Activities
Capital Contribution from Parent	100,000,000	0
Issuance of Long-term Debt	640,027,000	363,736,000
Change in Advances from Affiliates, Net	(128,331,000)	(174,433,000)
Retirement of Long-term Debt	(479,666,000)	(200,014,000)
Retirement of Long-term Debt - Affiliated	0	(100,000,000)
Retirement of Cumulative Preferred Stock	(8,000)	(4,000)
Principal Payments for Capital Lease Obligations	(5,546,000)	(5,350,000)
Dividends Paid on Common Stock	(97,500,000)	(88,000,000)
Dividends Paid on Cumulative Preferred Stock	(599,000)	(599,000)
Other Financing Activities	31,000	641,000
Net Cash Flows from (Used for) Financing Activities	28,408,000	(204,023,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,718,000	195,000
Cash and Cash Equivalents at Beginning of Period	951,000	2,006,000
Cash and Cash Equivalents at End of Period	2,669,000	2,201,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	145,969,000	140,391,000
Net Cash Paid (Received) for Income Taxes	(74,384,000)	(140,113,000)
Noncash Acquisitions Under Capital Leases	697,000	22,623,000
Government Grants Included in Accounts Receivable at September 30,	137,000	0
Construction Expenditures Included in Current Liabilities at September 30,	60,265,000	52,863,000
Columbus Southern Power Co [Member]
Operating Activities
Net Income (Loss)	213,599,000	210,823,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	117,831,000	113,733,000
Deferred Income Taxes	64,204,000	30,333,000
Carrying Costs Income	(9,115,000)	(6,212,000)
Allowance for Equity Funds Used During Construction	(1,890,000)	(1,502,000)
Mark-to-Market of Risk Management Contracts	6,723,000	(6,397,000)
Property Taxes	83,427,000	71,795,000
Fuel Over/Under-Recovery, Net	14,236,000	22,912,000
Change in Other Noncurrent Assets	(17,457,000)	(5,506,000)
Change in Other Noncurrent Liabilities	4,316,000	(14,413,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	61,290,000	11,164,000
Fuel, Materials and Supplies	25,278,000	6,419,000
Accounts Payable	(27,077,000)	(20,468,000)
Accrued Taxes, Net	(116,972,000)	(49,443,000)
Other Current Assets	9,873,000	6,110,000
Other Current Liabilities	(28,429,000)	(219,000)
Net Cash Flows from (Used for) Operating Activities	399,837,000	369,129,000
Investing Activities
Construction Expenditures	(137,360,000)	(148,441,000)
Change in Other Cash Deposits	2,243,000	13,890,000
Change in Advances to Affiliates, Net	(102,404,000)	(182,225,000)
Proceeds from Sales of Assets	6,855,000	4,278,000
Other Investing Activities	22,028,000	(586,000)
Net Cash Flows from (Used for) Investing Activities	(208,638,000)	(313,084,000)
Financing Activities
Issuance of Long-term Debt	0	149,443,000
Change in Advances from Affiliates, Net	0	(24,202,000)
Retirement of Long-term Debt - Affiliated	0	(100,000,000)
Principal Payments for Capital Lease Obligations	(2,519,000)	(3,322,000)
Dividends Paid on Common Stock	(187,500,000)	(77,500,000)
Other Financing Activities	145,000	119,000
Net Cash Flows from (Used for) Financing Activities	(189,874,000)	(55,462,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,325,000	583,000
Cash and Cash Equivalents at Beginning of Period	509,000	1,096,000
Cash and Cash Equivalents at End of Period	1,834,000	1,679,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	56,599,000	59,840,000
Net Cash Paid (Received) for Income Taxes	61,439,000	51,120,000
Noncash Acquisitions Under Capital Leases	679,000	9,521,000
Government Grants Included in Accounts Receivable at September 30,	1,539,000	0
Construction Expenditures Included in Current Liabilities at September 30,	12,534,000	12,561,000
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	128,515,000	121,960,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	100,564,000	101,932,000
Deferred Income Taxes	71,121,000	40,125,000
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	13,544,000	(12,323,000)
Allowance for Equity Funds Used During Construction	(11,790,000)	(11,945,000)
Mark-to-Market of Risk Management Contracts	9,014,000	(16,887,000)
Amortization of Nuclear Fuel	107,801,000	113,031,000
Pension Contributions to Qualified Plan Trust	(21,030,000)	(66,711,000)
Fuel Over/Under-Recovery, Net	(4,676,000)	(280,000)
Change in Other Noncurrent Assets	15,975,000	20,044,000
Change in Other Noncurrent Liabilities	45,633,000	63,409,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	78,062,000	4,814,000
Fuel, Materials and Supplies	40,476,000	(12,021,000)
Accounts Payable	(50,265,000)	(10,928,000)
Accrued Taxes, Net	74,510,000	72,156,000
Received Cook Plant Fire Costs	0	63,247,000
Other Current Assets	2,924,000	408,000
Other Current Liabilities	24,264,000	14,671,000
Net Cash Flows from (Used for) Operating Activities	624,642,000	484,702,000
Investing Activities
Construction Expenditures	(224,749,000)	(224,488,000)
Change in Advances to Affiliates, Net	(134,004,000)	(78,767,000)
Purchases of Investment Securities	(870,769,000)	(1,128,747,000)
Sales of Investment Securities	825,689,000	1,087,484,000
Acquisitions of Nuclear Fuel	(103,970,000)	(69,459,000)
Other Investing Activities	35,583,000	(6,213,000)
Net Cash Flows from (Used for) Investing Activities	(472,220,000)	(420,190,000)
Financing Activities
Issuance of Long-term Debt	76,414,000	84,564,000
Change in Advances from Affiliates, Net	(42,769,000)	0
Retirement of Long-term Debt	(122,469,000)	(19,208,000)
Retirement of Long-term Debt - Affiliated	0	(25,000,000)
Retirement of Cumulative Preferred Stock	0	(1,000)
Principal Payments for Capital Lease Obligations	(6,353,000)	(26,785,000)
Dividends Paid on Common Stock	(56,250,000)	(78,250,000)
Dividends Paid on Cumulative Preferred Stock	(255,000)	(255,000)
Other Financing Activities	53,000	433,000
Net Cash Flows from (Used for) Financing Activities	(151,629,000)	(64,502,000)
Net Increase (Decrease) in Cash and Cash Equivalents	793,000	10,000
Cash and Cash Equivalents at Beginning of Period	361,000	779,000
Cash and Cash Equivalents at End of Period	1,154,000	789,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	76,390,000	81,576,000
Net Cash Paid (Received) for Income Taxes	(96,339,000)	(66,680,000)
Noncash Acquisitions Under Capital Leases	2,492,000	9,708,000
Construction Expenditures Included in Current Liabilities at September 30,	28,132,000	19,690,000
Acquisition of Nuclear Fuel Included in Current Liabilities at September 30,	46,000	20,332,000
Noncash Increase in Long-Term Debt Through the Fort Wayne Lease Settlement	26,802,000	0
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	222,904,000	230,316,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	294,905,000	270,294,000
Deferred Income Taxes	53,598,000	126,128,000
Asset Impairments and Other Related Charges	89,824,000	0
Carrying Costs Income	(33,049,000)	(16,879,000)
Allowance for Equity Funds Used During Construction	(2,234,000)	(2,964,000)
Mark-to-Market of Risk Management Contracts	7,826,000	(7,726,000)
Pension Contributions to Qualified Plan Trust	(12,519,000)	(47,174,000)
Property Taxes	77,039,000	72,392,000
Fuel Over/Under-Recovery, Net	(56,225,000)	(115,926,000)
Change in Other Noncurrent Assets	(42,723,000)	(4,136,000)
Change in Other Noncurrent Liabilities	27,312,000	1,009,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	67,193,000	56,752,000
Fuel, Materials and Supplies	99,299,000	74,604,000
Accounts Payable	(51,959,000)	(45,601,000)
Accrued Taxes, Net	(80,406,000)	36,534,000
Other Current Assets	7,493,000	(5,170,000)
Other Current Liabilities	337,000	5,019,000
Net Cash Flows from (Used for) Operating Activities	668,615,000	627,472,000
Investing Activities
Construction Expenditures	(166,822,000)	(207,663,000)
Change in Advances to Affiliates, Net	(123,022,000)	147,638,000
Acquisitions of Assets	(1,200,000)	(4,876,000)
Proceeds from Sales of Assets	44,549,000	10,406,000
Other Investing Activities	1,207,000	(156,000)
Net Cash Flows from (Used for) Investing Activities	(245,288,000)	(54,651,000)
Financing Activities
Issuance of Long-term Debt	49,757,000	202,382,000
Retirement of Long-term Debt	(165,000,000)	(518,580,000)
Retirement of Cumulative Preferred Stock	(2,000)	0
Principal Payments for Capital Lease Obligations	(6,437,000)	(5,886,000)
Dividends Paid on Common Stock	(300,000,000)	(246,575,000)
Dividends Paid on Cumulative Preferred Stock	(549,000)	(549,000)
Other Financing Activities	(127,000)	(4,243,000)
Net Cash Flows from (Used for) Financing Activities	(422,358,000)	(573,451,000)
Net Increase (Decrease) in Cash and Cash Equivalents	969,000	(630,000)
Cash and Cash Equivalents at Beginning of Period	440,000	1,984,000
Cash and Cash Equivalents at End of Period	1,409,000	1,354,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	109,001,000	116,140,000
Net Cash Paid (Received) for Income Taxes	41,871,000	(110,627,000)
Noncash Acquisitions Under Capital Leases	1,519,000	23,645,000
Construction Expenditures Included in Current Liabilities at September 30,	33,604,000	13,156,000
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	104,298,000	75,060,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	72,761,000	80,911,000
Deferred Income Taxes	45,927,000	43,631,000
Carrying Costs Income	(3,333,000)	(2,449,000)
Allowance for Equity Funds Used During Construction	(839,000)	(387,000)
Mark-to-Market of Risk Management Contracts	(2,226,000)	(3,248,000)
Property Taxes	(9,715,000)	(9,198,000)
Fuel Over/Under-Recovery, Net	4,389,000	(107,657,000)
Change in Other Noncurrent Assets	14,041,000	(11,319,000)
Change in Other Noncurrent Liabilities	22,794,000	6,110,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	53,995,000	(162,000)
Fuel, Materials and Supplies	468,000	2,190,000
Accounts Payable	3,506,000	6,421,000
Accrued Taxes, Net	63,993,000	38,830,000
Other Current Assets	(3,839,000)	(494,000)
Other Current Liabilities	11,593,000	(10,554,000)
Net Cash Flows from (Used for) Operating Activities	377,813,000	107,685,000
Investing Activities
Construction Expenditures	(97,038,000)	(152,589,000)
Change in Advances to Affiliates, Net	(105,116,000)	62,695,000
Other Investing Activities	782,000	(450,000)
Net Cash Flows from (Used for) Investing Activities	(201,372,000)	(90,344,000)
Financing Activities
Issuance of Long-term Debt	247,481,000	1,740,000
Change in Advances from Affiliates, Net	(91,382,000)	23,024,000
Retirement of Long-term Debt	(275,000,000)	0
Retirement of Cumulative Preferred Stock	0	(300,000)
Principal Payments for Capital Lease Obligations	(3,103,000)	(3,025,000)
Dividends Paid on Common Stock	(52,500,000)	(38,026,000)
Dividends Paid on Cumulative Preferred Stock	(147,000)	(151,000)
Other Financing Activities	13,000	188,000
Net Cash Flows from (Used for) Financing Activities	(174,638,000)	(16,550,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,803,000	791,000
Cash and Cash Equivalents at Beginning of Period	470,000	796,000
Cash and Cash Equivalents at End of Period	2,273,000	1,587,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	23,397,000	37,915,000
Net Cash Paid (Received) for Income Taxes	(26,536,000)	(18,520,000)
Noncash Acquisitions Under Capital Leases	634,000	13,572,000
Construction Expenditures Included in Current Liabilities at September 30,	13,400,000	5,254,000
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	168,693,000	139,473,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	99,927,000	94,939,000
Deferred Income Taxes	36,979,000	1,227,000
Allowance for Equity Funds Used During Construction	(34,861,000)	(36,630,000)
Mark-to-Market of Risk Management Contracts	(3,148,000)	230,000
Pension Contributions to Qualified Plan Trust	(7,215,000)	(26,684,000)
Fuel Over/Under-Recovery, Net	(30,259,000)	(14,371,000)
Change in Other Noncurrent Assets	19,606,000	(16,101,000)
Change in Other Noncurrent Liabilities	39,900,000	41,231,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	9,718,000	(23,562,000)
Fuel, Materials and Supplies	(10,508,000)	27,811,000
Accounts Payable	2,906,000	(35,890,000)
Accrued Taxes, Net	68,674,000	49,249,000
Accrued Interest	(22,240,000)	(15,085,000)
Other Current Assets	(3,356,000)	(1,864,000)
Other Current Liabilities	(2,545,000)	(15,777,000)
Net Cash Flows from (Used for) Operating Activities	332,271,000	168,196,000
Investing Activities
Construction Expenditures	(395,193,000)	(288,043,000)
Change in Advances to Affiliates, Net	86,222,000	(161,873,000)
Other Investing Activities	(3,479,000)	863,000
Net Cash Flows from (Used for) Investing Activities	(312,450,000)	(449,053,000)
Financing Activities
Issuance of Long-term Debt	0	399,394,000
Credit Facility Borrowings	32,532,000	74,449,000
Change in Advances from Affiliates, Net	41,537,000	0
Retirement of Long-term Debt	(41,135,000)	(53,500,000)
Retirement of Long-term Debt - Affiliated	0	(50,000,000)
Retirement of Cumulative Preferred Stock	(2,000)	0
Credit Facility Repayments	(38,749,000)	(78,170,000)
Principal Payments for Capital Lease Obligations	(10,029,000)	(8,873,000)
Dividends Paid on Common Stock	(3,183,000)	(2,966,000)
Dividends Paid on Cumulative Preferred Stock	(172,000)	(172,000)
Other Financing Activities	3,650,000	916,000
Net Cash Flows from (Used for) Financing Activities	(15,551,000)	281,078,000
Net Increase (Decrease) in Cash and Cash Equivalents	4,270,000	221,000
Cash and Cash Equivalents at Beginning of Period	1,514,000	1,661,000
Cash and Cash Equivalents at End of Period	5,784,000	1,882,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	78,239,000	72,270,000
Net Cash Paid (Received) for Income Taxes	(8,586,000)	25,575,000
Noncash Acquisitions Under Capital Leases	10,296,000	653,000
Construction Expenditures Included in Current Liabilities at September 30,	$ 99,600,000	$ 101,017,000