Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net Income (Loss)	$ 703,000,000	$ 753,000,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	863,000,000	883,000,000
Deferred Income Taxes	367,000,000	417,000,000
Asset Impairments and Other Related Charges	154,000,000	0
Carrying Costs Income	(12,000,000)	(31,000,000)
Allowance for Equity Funds Used During Construction	(32,000,000)	(47,000,000)
Mark-to-Market of Risk Management Contracts	16,000,000	8,000,000
Amortization of Nuclear Fuel	63,000,000	64,000,000
Property Taxes	68,000,000	68,000,000
Fuel Over/Under-Recovery, Net	(4,000,000)	91,000,000
Deferral of Ohio Capacity Costs, Net	(102,000,000)	0
Change in Other Noncurrent Assets	(20,000,000)	(80,000,000)
Change in Other Noncurrent Liabilities	12,000,000	31,000,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(53,000,000)	93,000,000
Fuel, Materials and Supplies	(61,000,000)	(199,000,000)
Accounts Payable	(57,000,000)	(100,000,000)
Accrued Taxes, Net	(214,000,000)	(92,000,000)
Other Current Assets	(10,000,000)	(7,000,000)
Other Current Liabilities	(165,000,000)	(139,000,000)
Net Cash Flows from (Used for) Operating Activities	1,516,000,000	1,713,000,000
Investing Activities
Construction Expenditures	(1,637,000,000)	(1,371,000,000)
Change in Other Temporary Investments, Net	38,000,000	(1,000,000)
Purchases of Investment Securities	(423,000,000)	(546,000,000)
Sales of Investment Securities	385,000,000	517,000,000
Acquisitions of Nuclear Fuel	(59,000,000)	(11,000,000)
Acquisitions of Assets/Businesses	(4,000,000)	(88,000,000)
Insurance Proceeds Related to Cook Plant Fire	72,000,000	0
Proceeds from Sales of Assets	11,000,000	8,000,000
Other Investing Activities	(26,000,000)	(38,000,000)
Net Cash Flows from (Used for) Investing Activities	(1,643,000,000)	(1,530,000,000)
Financing Activities
Issuance of Common Stock, Net	41,000,000	50,000,000
Issuance of Long-term Debt	941,000,000	1,261,000,000
Credit Facility Borrowings	17,000,000	21,000,000
Change in Short-term Debt, Net	560,000,000	(425,000,000)
Retirement of Long-term Debt	(1,073,000,000)	(487,000,000)
Credit Facility Repayments	(20,000,000)	(38,000,000)
Principal Payments for Capital Lease Obligations	(33,000,000)	(36,000,000)
Dividends Paid on Common Stock	(469,000,000)	(458,000,000)
Other Financing Activities	1,000,000	5,000,000
Net Cash Flows from (Used for) Financing Activities	(35,000,000)	(107,000,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(162,000,000)	76,000,000
Cash and Cash Equivalents at Beginning of Period	279,000,000	221,000,000
Cash and Cash Equivalents at End of Period	117,000,000	297,000,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	455,000,000	444,000,000
Net Cash Paid (Received) for Income Taxes	(10,000,000)	(42,000,000)
Noncash Acquisitions Under Capital Leases	31,000,000	33,000,000
Construction Expenditures Included in Current Liabilities as of June 30,	297,000,000	255,000,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	41,000,000	0
Noncash Assumption of Liabilities Related to Acquisitions	0	56,000,000
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	100,410,000	137,643,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	171,143,000	165,552,000
Deferred Income Taxes	42,158,000	56,927,000
Carrying Costs Income	(3,236,000)	(13,252,000)
Allowance for Equity Funds Used During Construction	(1,983,000)	(517,000)
Mark-to-Market of Risk Management Contracts	6,765,000	(2,323,000)
Fuel Over/Under-Recovery, Net	25,919,000	26,417,000
Change in Other Noncurrent Assets	35,219,000	(16,708,000)
Change in Other Noncurrent Liabilities	9,670,000	18,266,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	73,280,000	103,680,000
Fuel, Materials and Supplies	(36,078,000)	(54,954,000)
Accounts Payable	(57,034,000)	(43,538,000)
Accrued Taxes, Net	18,058,000	30,032,000
Other Current Assets	1,621,000	2,579,000
Other Current Liabilities	(14,440,000)	(15,880,000)
Net Cash Flows from (Used for) Operating Activities	371,472,000	393,924,000
Investing Activities
Construction Expenditures	(194,200,000)	(212,959,000)
Change in Advances to Affiliates, Net	(279,000)	(565,000)
Other Investing Activities	(108,000)	3,158,000
Net Cash Flows from (Used for) Investing Activities	(194,587,000)	(210,366,000)
Financing Activities
Change in Advances from Affiliates, Net	(86,182,000)	(31,260,000)
Retirement of Long-term Debt	(14,000)	(49,512,000)
Principal Payments for Capital Lease Obligations	(2,623,000)	(3,258,000)
Dividends Paid on Common Stock	(90,000,000)	(100,000,000)
Other Financing Activities	1,093,000	264,000
Net Cash Flows from (Used for) Financing Activities	(177,726,000)	(183,766,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(841,000)	(208,000)
Cash and Cash Equivalents at Beginning of Period	3,576,000	2,317,000
Cash and Cash Equivalents at End of Period	2,735,000	2,109,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	92,994,000	100,319,000
Net Cash Paid (Received) for Income Taxes	425,000	(10,090,000)
Noncash Acquisitions Under Capital Leases	2,422,000	1,265,000
Construction Expenditures Included in Current Liabilities as of June 30,	34,114,000	30,439,000
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	84,211,000	69,031,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	86,598,000	71,539,000
Deferred Income Taxes	51,234,000	40,899,000
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	(18,283,000)	(9,163,000)
Allowance for Equity Funds Used During Construction	(10,527,000)	(5,335,000)
Mark-to-Market of Risk Management Contracts	9,096,000	(2,798,000)
Amortization of Nuclear Fuel	62,625,000	64,228,000
Fuel Over/Under-Recovery, Net	(1,796,000)	(2,650,000)
Change in Other Noncurrent Assets	(2,690,000)	6,849,000
Change in Other Noncurrent Liabilities	3,599,000	42,793,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	9,376,000	31,614,000
Fuel, Materials and Supplies	(17,460,000)	(8,475,000)
Accounts Payable	(48,048,000)	(33,573,000)
Accrued Taxes, Net	10,250,000	19,642,000
Other Current Assets	12,209,000	(9,183,000)
Other Current Liabilities	(16,764,000)	(26,557,000)
Net Cash Flows from (Used for) Operating Activities	213,630,000	248,861,000
Investing Activities
Construction Expenditures	(267,201,000)	(137,473,000)
Change in Advances to Affiliates, Net	(156,140,000)	(142,752,000)
Purchases of Investment Securities	(411,769,000)	(544,981,000)
Sales of Investment Securities	385,942,000	516,579,000
Acquisitions of Nuclear Fuel	(58,900,000)	(11,263,000)
Insurance Proceeds Related to Cook Plant Fire	72,000,000	0
Other Investing Activities	3,898,000	26,692,000
Net Cash Flows from (Used for) Investing Activities	(432,170,000)	(293,198,000)
Financing Activities
Issuance of Long-term Debt	348,899,000	128,533,000
Retirement of Long-term Debt	(103,793,000)	(55,995,000)
Principal Payments for Capital Lease Obligations	(2,791,000)	(3,490,000)
Dividends Paid on Common Stock	(25,000,000)	(25,000,000)
Other Financing Activities	677,000	167,000
Net Cash Flows from (Used for) Financing Activities	217,992,000	44,215,000
Net Increase (Decrease) in Cash and Cash Equivalents	(548,000)	(122,000)
Cash and Cash Equivalents at Beginning of Period	1,562,000	1,020,000
Cash and Cash Equivalents at End of Period	1,014,000	898,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	44,165,000	48,565,000
Net Cash Paid (Received) for Income Taxes	(27,608,000)	(31,921,000)
Noncash Acquisitions Under Capital Leases	1,888,000	4,341,000
Construction Expenditures Included in Current Liabilities as of June 30,	44,060,000	26,509,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	41,086,000	14,000
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	150,830,000	252,253,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	194,670,000	271,439,000
Deferred Income Taxes	55,839,000	82,961,000
Asset Impairments and Other Related Charges	154,304,000	0
Carrying Costs Income	(7,020,000)	(7,269,000)
Allowance for Equity Funds Used During Construction	(1,825,000)	(2,038,000)
Mark-to-Market of Risk Management Contracts	9,448,000	(8,328,000)
Property Taxes	111,392,000	109,892,000
Fuel Over/Under-Recovery, Net	15,267,000	(19,433,000)
Deferral of Ohio Capacity Costs, Net	(102,240,000)	0
Change in Other Noncurrent Assets	(16,273,000)	(20,063,000)
Change in Other Noncurrent Liabilities	2,421,000	416,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	100,747,000	64,404,000
Fuel, Materials and Supplies	9,714,000	(70,666,000)
Accounts Payable	(66,947,000)	(134,823,000)
Accrued Taxes, Net	(168,818,000)	(115,596,000)
Other Current Assets	5,391,000	7,982,000
Other Current Liabilities	(25,859,000)	(13,884,000)
Net Cash Flows from (Used for) Operating Activities	421,041,000	397,247,000
Investing Activities
Construction Expenditures	(296,888,000)	(246,657,000)
Change in Advances to Affiliates, Net	106,101,000	186,787,000
Proceeds from Sales of Assets	10,875,000	5,475,000
Other Investing Activities	1,085,000	6,705,000
Net Cash Flows from (Used for) Investing Activities	(178,827,000)	(47,690,000)
Financing Activities
Issuance of Long-term Debt	49,562,000	0
Issuance of Long-term Debt - Affiliated	200,000,000	0
Change in Advances from Affiliates, Net	292,051,000	0
Retirement of Long-term Debt	(606,000,000)	(194,500,000)
Principal Payments for Capital Lease Obligations	(4,747,000)	(4,920,000)
Dividends Paid on Common Stock	(175,000,000)	(150,000,000)
Other Financing Activities	825,000	134,000
Net Cash Flows from (Used for) Financing Activities	(243,309,000)	(349,286,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(1,095,000)	271,000
Cash and Cash Equivalents at Beginning of Period	3,640,000	2,095,000
Cash and Cash Equivalents at End of Period	2,545,000	2,366,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	105,876,000	107,216,000
Net Cash Paid (Received) for Income Taxes	48,841,000	15,019,000
Noncash Acquisitions Under Capital Leases	3,335,000	4,239,000
Government Grants Included in Accounts Receivable as of June 30,	0	1,094,000
Construction Expenditures Included in Current Liabilities as of June 30,	56,618,000	41,873,000
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	42,125,000	47,859,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	48,258,000	46,923,000
Deferred Income Taxes	27,562,000	15,275,000
Carrying Costs Income	(317,000)	(1,142,000)
Allowance for Equity Funds Used During Construction	(1,824,000)	(890,000)
Mark-to-Market of Risk Management Contracts	(3,779,000)	4,652,000
Property Taxes	(20,353,000)	(19,347,000)
Fuel Over/Under-Recovery, Net	(19,331,000)	76,098,000
Change in Other Noncurrent Assets	10,999,000	1,043,000
Change in Other Noncurrent Liabilities	(10,740,000)	(5,409,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(4,747,000)	2,560,000
Fuel, Materials and Supplies	(1,099,000)	2,481,000
Accounts Payable	21,581,000	(3,263,000)
Accrued Taxes, Net	13,052,000	32,771,000
Other Current Assets	2,257,000	919,000
Other Current Liabilities	(7,298,000)	(3,987,000)
Net Cash Flows from (Used for) Operating Activities	96,346,000	196,543,000
Investing Activities
Construction Expenditures	(112,864,000)	(102,354,000)
Change in Advances to Affiliates, Net	10,558,000	(80,548,000)
Other Investing Activities	9,090,000	413,000
Net Cash Flows from (Used for) Investing Activities	(93,216,000)	(182,489,000)
Financing Activities
Issuance of Long-term Debt	0	2,395,000
Change in Advances from Affiliates, Net	25,276,000	0
Retirement of Long-term Debt	(200,000)	(32,000)
Principal Payments for Capital Lease Obligations	(1,586,000)	(1,704,000)
Dividends Paid on Common Stock	(27,500,000)	(15,000,000)
Other Financing Activities	555,000	107,000
Net Cash Flows from (Used for) Financing Activities	(3,455,000)	(14,234,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(325,000)	(180,000)
Cash and Cash Equivalents at Beginning of Period	1,367,000	1,413,000
Cash and Cash Equivalents at End of Period	1,042,000	1,233,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	26,155,000	26,581,000
Net Cash Paid (Received) for Income Taxes	6,295,000	5,992,000
Noncash Acquisitions Under Capital Leases	5,594,000	759,000
Construction Expenditures Included in Current Liabilities as of June 30,	26,812,000	14,881,000
Cash Dividends Declared but Not Paid	0	15,000,000
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	41,775,000	91,297,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	90,614,000	68,676,000
Deferred Income Taxes	39,624,000	138,594,000
Asset Impairments and Other Related Charges	0	13,000,000
Allowance for Equity Funds Used During Construction	(2,392,000)	(28,185,000)
Mark-to-Market of Risk Management Contracts	35,000	1,927,000
Property Taxes	(23,607,000)	(19,790,000)
Fuel Over/Under-Recovery, Net	(17,350,000)	(4,398,000)
Change in Other Noncurrent Assets	(3,639,000)	1,678,000
Change in Other Noncurrent Liabilities	5,647,000	17,707,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	6,979,000	(12,989,000)
Fuel, Materials and Supplies	(6,452,000)	(16,901,000)
Accounts Payable	1,277,000	2,938,000
Accrued Taxes, Net	11,079,000	(40,616,000)
Other Current Assets	3,541,000	(7,685,000)
Other Current Liabilities	(12,121,000)	(6,367,000)
Net Cash Flows from (Used for) Operating Activities	135,010,000	198,886,000
Investing Activities
Construction Expenditures	(187,607,000)	(246,957,000)
Change in Advances to Affiliates, Net	139,023,000	(97,022,000)
Other Investing Activities	342,000	(1,927,000)
Net Cash Flows from (Used for) Investing Activities	(48,242,000)	(345,906,000)
Financing Activities
Issuance of Long-term Debt	0	336,576,000
Credit Facility Borrowings	17,091,000	21,462,000
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)	(38,478,000)
Principal Payments for Capital Lease Obligations	(8,877,000)	(7,899,000)
Dividends Paid on Common Stock	(62,500,000)	0
Dividends Paid on Common Stock	(2,040,000)	(2,195,000)
Other Financing Activities	681,000	3,843,000
Net Cash Flows from (Used for) Financing Activities	(76,964,000)	160,836,000
Net Increase (Decrease) in Cash and Cash Equivalents	9,804,000	13,816,000
Cash and Cash Equivalents at Beginning of Period	2,036,000	801,000
Cash and Cash Equivalents at End of Period	11,840,000	14,617,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	61,663,000	32,595,000
Net Cash Paid (Received) for Income Taxes	1,161,000	(47,741,000)
Noncash Acquisitions Under Capital Leases	2,851,000	12,350,000
Construction Expenditures Included in Current Liabilities as of June 30,	$ 35,940,000	$ 79,960,000