Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net Income (Loss)	$ 952,000,000	$ 703,000,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	934,000,000	863,000,000
Deferred Income Taxes	410,000,000	367,000,000
Asset Impairments and Other Related Charges	0	154,000,000
Carrying Costs Income	(15,000,000)	(12,000,000)
Allowance for Equity Funds Used During Construction	(47,000,000)	(32,000,000)
Mark-to-Market of Risk Management Contracts	9,000,000	16,000,000
Amortization of Nuclear Fuel	79,000,000	63,000,000
Pension Contributions to Qualified Plan Trust	(71,000,000)	0
Property Taxes	92,000,000	68,000,000
Fuel Over/Under-Recovery, Net	(105,000,000)	(4,000,000)
Deferral of Ohio Capacity Costs, Net	(99,000,000)	(102,000,000)
Change in Other Noncurrent Assets	11,000,000	(20,000,000)
Change in Other Noncurrent Liabilities	132,000,000	12,000,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(73,000,000)	(53,000,000)
Fuel, Materials and Supplies	207,000,000	(61,000,000)
Accounts Payable	(39,000,000)	(57,000,000)
Accrued Taxes, Net	(86,000,000)	(214,000,000)
Other Current Assets	(3,000,000)	(10,000,000)
Other Current Liabilities	(91,000,000)	(165,000,000)
Net Cash Flows from (Used for) Operating Activities	2,197,000,000	1,516,000,000
Investing Activities
Construction Expenditures	(1,883,000,000)	(1,637,000,000)
Change in Other Temporary Investments, Net	(24,000,000)	38,000,000
Purchases of Investment Securities	(510,000,000)	(423,000,000)
Sales of Investment Securities	483,000,000	385,000,000
Acquisitions of Nuclear Fuel	(58,000,000)	(59,000,000)
Acquisitions of Assets/Businesses	(45,000,000)	(4,000,000)
Insurance Proceeds Related to Cook Plant Fire	0	72,000,000
Proceeds from Sales of Assets	2,000,000	11,000,000
Other Investing Activities	(33,000,000)	(26,000,000)
Net Cash Flows from (Used for) Investing Activities	(2,068,000,000)	(1,643,000,000)
Financing Activities
Issuance of Common Stock, Net	29,000,000	41,000,000
Issuance of Long-term Debt	939,000,000	941,000,000
Credit Facility Borrowings	0	17,000,000
Change in Short-term Debt, Net	725,000,000	560,000,000
Retirement of Long-term Debt	(1,205,000,000)	(1,073,000,000)
Credit Facility Repayments	0	(20,000,000)
Principal Payments for Capital Lease Obligations	(60,000,000)	(33,000,000)
Dividends Paid on Common Stock	(490,000,000)	(469,000,000)
Other Financing Activities	5,000,000	1,000,000
Net Cash Flows from (Used for) Financing Activities	(57,000,000)	(35,000,000)
Net Increase (Decrease) in Cash and Cash Equivalents	72,000,000	(162,000,000)
Cash and Cash Equivalents at Beginning of Period	118,000,000	279,000,000
Cash and Cash Equivalents at End of Period	190,000,000	117,000,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	422,000,000	455,000,000
Net Cash Paid (Received) for Income Taxes	63,000,000	(10,000,000)
Noncash Acquisitions Under Capital Leases	33,000,000	31,000,000
Construction Expenditures Included in Current Liabilities as of June 30,	432,000,000	297,000,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	42,000,000	41,000,000
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	138,098,000	100,410,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	200,236,000	171,143,000
Deferred Income Taxes	90,236,000	42,158,000
Carrying Costs Income	1,612,000	(3,236,000)
Allowance for Equity Funds Used During Construction	(2,860,000)	(1,983,000)
Mark-to-Market of Risk Management Contracts	(6,025,000)	6,765,000
Pension Contributions to Qualified Plan Trust	(8,963,000)	0
Fuel Over/Under-Recovery, Net	(108,943,000)	25,919,000
Change in Other Noncurrent Assets	2,861,000	35,219,000
Change in Other Noncurrent Liabilities	23,626,000	9,670,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	93,553,000	73,280,000
Fuel, Materials and Supplies	69,120,000	(36,078,000)
Accounts Payable	(46,812,000)	(57,034,000)
Accrued Taxes, Net	(9,690,000)	18,058,000
Other Current Assets	(2,294,000)	1,621,000
Other Current Liabilities	(10,469,000)	(14,440,000)
Net Cash Flows from (Used for) Operating Activities	423,286,000	371,472,000
Investing Activities
Construction Expenditures	(224,879,000)	(194,200,000)
Change in Advances to Affiliates, Net	63,691,000	(279,000)
Other Investing Activities	(14,754,000)	(108,000)
Net Cash Flows from (Used for) Investing Activities	(175,942,000)	(194,587,000)
Financing Activities
Issuance of Long-term Debt	295,042,000	0
Change in Advances from Affiliates, Net	0	(86,182,000)
Retirement of Long-term Debt	(500,016,000)	(14,000)
Principal Payments for Capital Lease Obligations	(2,904,000)	(2,623,000)
Dividends Paid on Common Stock	(40,000,000)	(90,000,000)
Other Financing Activities	1,002,000	1,093,000
Net Cash Flows from (Used for) Financing Activities	(246,876,000)	(177,726,000)
Net Increase (Decrease) in Cash and Cash Equivalents	468,000	(841,000)
Cash and Cash Equivalents at Beginning of Period	2,745,000	3,576,000
Cash and Cash Equivalents at End of Period	3,213,000	2,735,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	96,564,000	92,994,000
Net Cash Paid (Received) for Income Taxes	1,280,000	425,000
Noncash Acquisitions Under Capital Leases	3,133,000	2,422,000
Construction Expenditures Included in Current Liabilities as of June 30,	50,052,000	34,114,000
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	114,423,000	84,211,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	99,477,000	86,598,000
Deferred Income Taxes	17,499,000	51,234,000
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	28,358,000	(18,283,000)
Allowance for Equity Funds Used During Construction	(8,768,000)	(10,527,000)
Mark-to-Market of Risk Management Contracts	(4,378,000)	9,096,000
Amortization of Nuclear Fuel	78,560,000	62,625,000
Fuel Over/Under-Recovery, Net	14,567,000	(1,796,000)
Change in Other Noncurrent Assets	(42,263,000)	(2,690,000)
Change in Other Noncurrent Liabilities	44,269,000	3,599,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	45,666,000	9,376,000
Fuel, Materials and Supplies	4,668,000	(17,460,000)
Accounts Payable	(26,859,000)	(48,048,000)
Accrued Taxes, Net	17,381,000	10,250,000
Other Current Assets	9,815,000	12,209,000
Other Current Liabilities	(22,913,000)	(16,764,000)
Net Cash Flows from (Used for) Operating Activities	369,502,000	213,630,000
Investing Activities
Construction Expenditures	(224,937,000)	(267,201,000)
Change in Advances to Affiliates, Net	42,357,000	(156,140,000)
Purchases of Investment Securities	(508,835,000)	(411,769,000)
Sales of Investment Securities	482,534,000	385,942,000
Acquisitions of Nuclear Fuel	(57,991,000)	(58,900,000)
Insurance Proceeds Related to Cook Plant Fire	0	72,000,000
Other Investing Activities	9,299,000	3,898,000
Net Cash Flows from (Used for) Investing Activities	(257,573,000)	(432,170,000)
Financing Activities
Issuance of Long-term Debt	99,419,000	348,899,000
Change in Advances from Affiliates, Net	47,353,000	0
Retirement of Long-term Debt	(160,292,000)	(103,793,000)
Principal Payments for Capital Lease Obligations	(23,622,000)	(2,791,000)
Dividends Paid on Common Stock	(75,000,000)	(25,000,000)
Other Financing Activities	554,000	677,000
Net Cash Flows from (Used for) Financing Activities	(111,588,000)	217,992,000
Net Increase (Decrease) in Cash and Cash Equivalents	341,000	(548,000)
Cash and Cash Equivalents at Beginning of Period	1,317,000	1,562,000
Cash and Cash Equivalents at End of Period	1,658,000	1,014,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	42,779,000	44,165,000
Net Cash Paid (Received) for Income Taxes	13,206,000	(27,608,000)
Noncash Acquisitions Under Capital Leases	3,918,000	1,888,000
Construction Expenditures Included in Current Liabilities as of June 30,	59,759,000	44,060,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	42,076,000	41,086,000
Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage	2,444,000	0
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	117,309,000	150,830,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	110,184,000	194,670,000
Amortization of Generation Deferrals	56,163,000	0
Deferred Income Taxes	41,576,000	55,839,000
Asset Impairments and Other Related Charges	0	154,304,000
Carrying Costs Income	(13,988,000)	(7,020,000)
Allowance for Equity Funds Used During Construction	(3,068,000)	(1,825,000)
Mark-to-Market of Risk Management Contracts	(6,379,000)	9,448,000
Pension Contributions to Qualified Plan Trust	(6,547,000)	0
Property Taxes	100,522,000	111,392,000
Fuel Over/Under-Recovery, Net	28,671,000	15,267,000
Deferral of Ohio Capacity Costs, Net	(120,743,000)	(102,240,000)
Change in Other Noncurrent Assets	13,281,000	(16,273,000)
Change in Other Noncurrent Liabilities	46,213,000	2,421,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(2,256,000)	100,747,000
Fuel, Materials and Supplies	(4,205,000)	9,714,000
Accounts Payable	(70,228,000)	(66,947,000)
Customer Deposits	480,000	(2,302,000)
Accrued Taxes, Net	(138,584,000)	(168,818,000)
Other Current Assets	(560,000)	5,391,000
Other Current Liabilities	(24,522,000)	(23,557,000)
Net Cash Flows from (Used for) Operating Activities	123,319,000	421,041,000
Investing Activities
Construction Expenditures	(213,974,000)	(296,888,000)
Change in Restricted Cash for Securitized Funding	(23,616,000)	0
Change in Advances to Affiliates, Net	339,070,000	106,101,000
Proceeds from Notes Receivable Affiliated	139,450,000	0
Other Investing Activities	3,570,000	11,960,000
Net Cash Flows from (Used for) Investing Activities	244,500,000	(178,827,000)
Financing Activities
Issuance of Long-term Debt	0	49,562,000
Issuance of Long-term Debt - Affiliated	0	200,000,000
Change in Advances from Affiliates, Net	34,723,000	292,051,000
Retirement of Long-term Debt	(364,498,000)	(606,000,000)
Principal Payments for Capital Lease Obligations	(2,562,000)	(4,747,000)
Dividends Paid on Common Stock	(35,000,000)	(175,000,000)
Other Financing Activities	989,000	825,000
Net Cash Flows from (Used for) Financing Activities	(366,348,000)	(243,309,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,471,000	(1,095,000)
Cash and Cash Equivalents at Beginning of Period	3,004,000	3,640,000
Cash and Cash Equivalents at End of Period	4,475,000	2,545,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	69,127,000	105,876,000
Net Cash Paid (Received) for Income Taxes	10,863,000	48,841,000
Noncash Acquisitions Under Capital Leases	3,754,000	3,335,000
Construction Expenditures Included in Current Liabilities as of June 30,	40,878,000	56,618,000
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	30,897,000	42,125,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	48,589,000	48,258,000
Deferred Income Taxes	28,493,000	27,562,000
Carrying Costs Income	0	(317,000)
Allowance for Equity Funds Used During Construction	(2,021,000)	(1,824,000)
Mark-to-Market of Risk Management Contracts	578,000	(3,779,000)
Pension Contributions to Qualified Plan Trust	(4,439,000)	0
Property Taxes	(15,940,000)	(20,353,000)
Fuel Over/Under-Recovery, Net	(38,554,000)	(19,331,000)
Change in Other Noncurrent Assets	(10,411,000)	10,999,000
Change in Other Noncurrent Liabilities	(3,079,000)	(10,740,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(4,382,000)	(4,747,000)
Fuel, Materials and Supplies	3,330,000	(1,099,000)
Accounts Payable	959,000	21,581,000
Accrued Taxes, Net	(1,116,000)	13,052,000
Other Current Assets	(1,386,000)	1,940,000
Other Current Liabilities	9,888,000	(7,298,000)
Net Cash Flows from (Used for) Operating Activities	41,406,000	96,346,000
Investing Activities
Construction Expenditures	(170,565,000)	(112,864,000)
Change in Advances to Affiliates, Net	0	10,558,000
Other Investing Activities	1,560,000	9,090,000
Net Cash Flows from (Used for) Investing Activities	(169,005,000)	(93,216,000)
Financing Activities
Issuance of Long-term Debt	74,975,000	0
Change in Advances from Affiliates, Net	88,028,000	25,276,000
Retirement of Long-term Debt	(33,906,000)	(200,000)
Principal Payments for Capital Lease Obligations	(1,731,000)	(1,586,000)
Dividends Paid on Common Stock	0	(27,500,000)
Other Financing Activities	583,000	555,000
Net Cash Flows from (Used for) Financing Activities	127,949,000	(3,455,000)
Net Increase (Decrease) in Cash and Cash Equivalents	350,000	(325,000)
Cash and Cash Equivalents at Beginning of Period	1,277,000	1,367,000
Cash and Cash Equivalents at End of Period	1,627,000	1,042,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	26,684,000	26,155,000
Net Cash Paid (Received) for Income Taxes	2,463,000	6,295,000
Noncash Acquisitions Under Capital Leases	1,190,000	5,594,000
Construction Expenditures Included in Current Liabilities as of June 30,	40,150,000	26,812,000
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	55,785,000	41,775,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	91,525,000	90,614,000
Deferred Income Taxes	179,336,000	39,624,000
Allowance for Equity Funds Used During Construction	(4,278,000)	(2,392,000)
Mark-to-Market of Risk Management Contracts	593,000	35,000
Pension Contributions to Qualified Plan Trust	(3,832,000)	0
Property Taxes	(25,053,000)	(23,607,000)
Fuel Over/Under-Recovery, Net	(18,825,000)	(17,350,000)
Change in Other Noncurrent Assets	8,034,000	(3,639,000)
Change in Other Noncurrent Liabilities	(3,464,000)	5,647,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	21,194,000	6,979,000
Fuel, Materials and Supplies	22,914,000	(6,452,000)
Accounts Payable	8,186,000	1,277,000
Accrued Taxes, Net	(108,460,000)	11,079,000
Other Current Assets	(3,310,000)	3,541,000
Other Current Liabilities	(10,700,000)	(12,121,000)
Net Cash Flows from (Used for) Operating Activities	209,645,000	135,010,000
Investing Activities
Construction Expenditures	(220,968,000)	(187,607,000)
Change in Advances to Affiliates, Net	0	139,023,000
Other Investing Activities	3,394,000	342,000
Net Cash Flows from (Used for) Investing Activities	(217,574,000)	(48,242,000)
Financing Activities
Credit Facility Borrowings	0	17,091,000
Change in Advances from Affiliates, Net	69,918,000	0
Retirement of Long-term Debt	(1,625,000)	(1,625,000)
Credit Facility Repayments	0	(19,694,000)
Principal Payments for Capital Lease Obligations	(9,156,000)	(8,877,000)
Dividends Paid on Common Stock	(50,000,000)	(62,500,000)
Dividends Paid on Common Stock	(2,309,000)	(2,040,000)
Other Financing Activities	831,000	681,000
Net Cash Flows from (Used for) Financing Activities	7,659,000	(76,964,000)
Net Increase (Decrease) in Cash and Cash Equivalents	(270,000)	9,804,000
Cash and Cash Equivalents at Beginning of Period	17,241,000	2,036,000
Cash and Cash Equivalents at End of Period	16,971,000	11,840,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	60,001,000	61,663,000
Net Cash Paid (Received) for Income Taxes	(7,556,000)	1,161,000
Noncash Acquisitions Under Capital Leases	3,354,000	2,851,000
Construction Expenditures Included in Current Liabilities as of June 30,	$ 63,813,000	$ 35,940,000