Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net Income (Loss)	$ 631,000,000us-gaap_ProfitLoss	$ 561,000,000us-gaap_ProfitLoss
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	505,000,000	491,000,000
Deferred Income Taxes	243,000,000us-gaap_DeferredIncomeTaxExpenseBenefit	299,000,000us-gaap_DeferredIncomeTaxExpenseBenefit
Carrying Costs Income	(8,000,000)aep_CarryingCostsIncome	(6,000,000)aep_CarryingCostsIncome
Allowance for Equity Funds Used During Construction	(30,000,000)	(22,000,000)
Mark-to-Market of Risk Management Contracts	(21,000,000)us-gaap_UnrealizedGainLossOnDerivatives	6,000,000us-gaap_UnrealizedGainLossOnDerivatives
Amortization of Nuclear Fuel	38,000,000aep_AmortizationOfNuclearFuel	38,000,000aep_AmortizationOfNuclearFuel
Property Taxes	(35,000,000)	(54,000,000)
Fuel Over/Under-Recovery, Net	3,000,000aep_FuelOverUnderRecoveryNet	(137,000,000)aep_FuelOverUnderRecoveryNet
Deferral of Ohio Capacity Costs, Net	(7,000,000)aep_DeferralOfOhioCapacityCosts	(56,000,000)aep_DeferralOfOhioCapacityCosts
Change in Other Noncurrent Assets	1,000,000	(25,000,000)
Change in Other Noncurrent Liabilities	(31,000,000)	77,000,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	37,000,000	(83,000,000)
Fuel, Materials and Supplies	133,000,000us-gaap_IncreaseDecreaseInInventories	209,000,000us-gaap_IncreaseDecreaseInInventories
Accounts Payable	49,000,000	33,000,000
Accrued Taxes, Net	35,000,000	(16,000,000)
Other Current Assets	(17,000,000)	(51,000,000)
Other Current Liabilities	(269,000,000)	(131,000,000)
Net Cash Flows from (Used for) Operating Activities	1,257,000,000	1,133,000,000
Investing Activities
Construction Expenditures	(1,077,000,000)	(907,000,000)
Change in Other Temporary Investments, Net	93,000,000	44,000,000
Purchases of Investment Securities	(246,000,000)us-gaap_PaymentsToAcquireInvestments	(165,000,000)us-gaap_PaymentsToAcquireInvestments
Sales of Investment Securities	228,000,000	148,000,000
Acquisitions of Nuclear Fuel	(52,000,000)us-gaap_PaymentsForNuclearFuel	(49,000,000)us-gaap_PaymentsForNuclearFuel
Acquisitions of Assets/Businesses	(2,000,000)	(43,000,000)
Other Investing Activities	39,000,000	(9,000,000)
Net Cash Flows from (Used for) Investing Activities	(1,017,000,000)	(981,000,000)
Financing Activities
Issuance of Common Stock, Net	31,000,000	15,000,000
Issuance of Long-term Debt	774,000,000	76,000,000
Change in Short-term Debt, Net	(491,000,000)	575,000,000
Retirement of Long-term Debt	(239,000,000)us-gaap_RepaymentsOfLongTermDebt	(370,000,000)us-gaap_RepaymentsOfLongTermDebt
Principal Payments for Capital Lease Obligations	(31,000,000)	(33,000,000)
Dividends Paid on Common Stock	(260,000,000)us-gaap_PaymentsOfDividendsCommonStock	(245,000,000)us-gaap_PaymentsOfDividendsCommonStock
Other Financing Activities	3,000,000	4,000,000
Net Cash Flows from (Used for) Financing Activities	(213,000,000)	22,000,000
Net Increase (Decrease) in Cash and Cash Equivalents	27,000,000	174,000,000
Cash and Cash Equivalents at Beginning of Period	163,000,000	118,000,000
Cash and Cash Equivalents at End of Period	190,000,000	292,000,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	223,000,000us-gaap_InterestPaidNet	234,000,000us-gaap_InterestPaidNet
Net Cash Paid (Received) for Income Taxes	2,000,000us-gaap_IncomeTaxesPaidNet	(6,000,000)us-gaap_IncomeTaxesPaidNet
Noncash Acquisitions Under Capital Leases	29,000,000us-gaap_CapitalLeaseObligationsIncurred	20,000,000us-gaap_CapitalLeaseObligationsIncurred
Construction Expenditures Included in Current Liabilities as of March 31,	529,000,000	387,000,000
Construction Expenditures Included in Noncurrent Liabilities as of March 31,	43,000,000	0
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	141,793,000	101,851,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	100,143,000	104,586,000
Deferred Income Taxes	49,834,000	65,690,000
Carrying Costs Income	(293,000)	1,875,000
Allowance for Equity Funds Used During Construction	(3,008,000)	(1,235,000)
Mark-to-Market of Risk Management Contracts	9,760,000	1,625,000
Fuel Over/Under-Recovery, Net	(26,209,000)	(102,051,000)
Change in Other Noncurrent Assets	3,886,000	4,959,000
Change in Other Noncurrent Liabilities	(32,562,000)	7,799,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	7,260,000	41,382,000
Fuel, Materials and Supplies	39,623,000	88,057,000
Accounts Payable	(2,199,000)	(4,314,000)
Accrued Taxes, Net	31,805,000	929,000
Other Current Assets	(2,980,000)	(7,276,000)
Other Current Liabilities	(15,801,000)	(6,707,000)
Net Cash Flows from (Used for) Operating Activities	301,052,000	297,170,000
Investing Activities
Construction Expenditures	(140,964,000)	(112,824,000)
Change in Advances to Affiliates, Net	(103,629,000)	(153,031,000)
Other Investing Activities	13,047,000	(8,677,000)
Net Cash Flows from (Used for) Investing Activities	(231,546,000)	(274,532,000)
Financing Activities
Retirement of Long-term Debt	(11,046,000)	(8,000)
Principal Payments for Capital Lease Obligations	(1,313,000)	(1,559,000)
Dividends Paid on Common Stock	(56,250,000)	(20,000,000)
Other Financing Activities	392,000	942,000
Net Cash Flows from (Used for) Financing Activities	(68,217,000)	(20,625,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,289,000	2,013,000
Cash and Cash Equivalents at Beginning of Period	2,613,000	2,745,000
Cash and Cash Equivalents at End of Period	3,902,000	4,758,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	37,335,000	39,431,000
Net Cash Paid (Received) for Income Taxes	61,000	0
Noncash Acquisitions Under Capital Leases	1,540,000	2,657,000
Construction Expenditures Included in Current Liabilities as of March 31,	69,980,000	38,972,000
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	72,674,000	87,089,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	51,407,000	50,031,000
Deferred Income Taxes	15,568,000	21,017,000
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net	(9,316,000)	14,821,000
Allowance for Equity Funds Used During Construction	(4,043,000)	(3,964,000)
Mark-to-Market of Risk Management Contracts	12,440,000	426,000
Amortization of Nuclear Fuel	38,327,000	38,049,000
Fuel Over/Under-Recovery, Net	(2,996,000)	11,683,000
Change in Other Noncurrent Assets	6,201,000	(16,211,000)
Change in Other Noncurrent Liabilities	(7,820,000)	11,505,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	31,915,000	24,411,000
Fuel, Materials and Supplies	8,758,000	7,340,000
Accounts Payable	(181,000)	(20,902,000)
Accrued Taxes, Net	28,475,000	29,583,000
Other Current Assets	7,632,000	5,933,000
Other Current Liabilities	(30,640,000)	(18,862,000)
Net Cash Flows from (Used for) Operating Activities	218,401,000	241,949,000
Investing Activities
Construction Expenditures	(111,802,000)	(117,807,000)
Change in Advances to Affiliates, Net	(16,000)	(3,299,000)
Purchases of Investment Securities	(245,841,000)	(164,511,000)
Sales of Investment Securities	228,164,000	147,700,000
Acquisitions of Nuclear Fuel	(51,834,000)	(49,420,000)
Other Investing Activities	5,631,000	8,860,000
Net Cash Flows from (Used for) Investing Activities	(175,698,000)	(178,477,000)
Financing Activities
Change in Advances from Affiliates, Net	25,649,000	0
Retirement of Long-term Debt	(25,937,000)	(26,337,000)
Principal Payments for Capital Lease Obligations	(12,154,000)	(11,569,000)
Dividends Paid on Common Stock	(30,000,000)	(25,000,000)
Other Financing Activities	490,000	405,000
Net Cash Flows from (Used for) Financing Activities	(41,952,000)	(62,501,000)
Net Increase (Decrease) in Cash and Cash Equivalents	751,000	971,000
Cash and Cash Equivalents at Beginning of Period	1,020,000	1,317,000
Cash and Cash Equivalents at End of Period	1,771,000	2,288,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	34,980,000	34,592,000
Net Cash Paid (Received) for Income Taxes	1,959,000	0
Noncash Acquisitions Under Capital Leases	827,000	2,406,000
Construction Expenditures Included in Current Liabilities as of March 31,	66,324,000	56,668,000
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	0	116,000
Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage	143,000	854,000
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	65,367,000	60,774,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	59,212,000	58,699,000
Amortization of Generation Deferrals	31,454,000	31,186,000
Deferred Income Taxes	1,749,000	24,917,000
Carrying Costs Income	(6,460,000)	(7,114,000)
Allowance for Equity Funds Used During Construction	(2,444,000)	(1,726,000)
Mark-to-Market of Risk Management Contracts	1,478,000	(1,060,000)
Property Taxes	49,760,000	48,743,000
Fuel Over/Under-Recovery, Net	(2,965,000)	12,265,000
Deferral of Ohio Capacity Costs, Net	(18,172,000)	(56,167,000)
Change in Other Noncurrent Assets	33,029,000	(21,285,000)
Change in Other Noncurrent Liabilities	24,903,000	29,277,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	4,719,000	(34,984,000)
Fuel, Materials and Supplies	(7,271,000)	(1,600,000)
Accounts Payable	(25,168,000)	(30,911,000)
Accrued Taxes, Net	(59,528,000)	(98,147,000)
Other Current Assets	(1,237,000)	(1,415,000)
Other Current Liabilities	(3,334,000)	(13,633,000)
Net Cash Flows from (Used for) Operating Activities	145,092,000	(2,181,000)
Investing Activities
Construction Expenditures	(119,723,000)	(100,220,000)
Change in Restricted Cash for Securitized Funding	11,562,000	(12,668,000)
Change in Advances to Affiliates, Net	21,217,000	339,070,000
Other Investing Activities	2,873,000	1,162,000
Net Cash Flows from (Used for) Investing Activities	(84,071,000)	227,344,000
Financing Activities
Change in Advances from Affiliates, Net	0	27,108,000
Retirement of Long-term Debt	(22,219,000)	(225,029,000)
Principal Payments for Capital Lease Obligations	(947,000)	(1,396,000)
Dividends Paid on Common Stock	(37,500,000)	(25,000,000)
Other Financing Activities	1,141,000	930,000
Net Cash Flows from (Used for) Financing Activities	(59,525,000)	(223,387,000)
Net Increase (Decrease) in Cash and Cash Equivalents	1,496,000	1,776,000
Cash and Cash Equivalents at Beginning of Period	2,870,000	3,004,000
Cash and Cash Equivalents at End of Period	4,366,000	4,780,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	18,813,000	23,425,000
Net Cash Paid (Received) for Income Taxes	(46,000)	0
Noncash Acquisitions Under Capital Leases	1,619,000	3,324,000
Construction Expenditures Included in Current Liabilities as of March 31,	42,947,000	46,910,000
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	13,685,000	8,448,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	29,534,000	23,982,000
Deferred Income Taxes	8,870,000	19,178,000
Allowance for Equity Funds Used During Construction	(1,327,000)	(1,431,000)
Mark-to-Market of Risk Management Contracts	(225,000)	(267,000)
Property Taxes	(24,148,000)	(31,260,000)
Fuel Over/Under-Recovery, Net	24,995,000	(23,394,000)
Change in Regulatory Assets	132,000	(8,468,000)
Change in Regulatory Liabilities	8,111,000	254,000
Change in Other Noncurrent Assets	(4,922,000)	(1,045,000)
Change in Other Noncurrent Liabilities	8,313,000	(2,458,000)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	4,481,000	14,193,000
Fuel, Materials and Supplies	(1,963,000)	149,000
Accounts Payable	(6,805,000)	(16,891,000)
Accrued Taxes, Net	14,776,000	7,362,000
Other Current Assets	(8,998,000)	(395,000)
Other Current Liabilities	(7,297,000)	22,401,000
Net Cash Flows from (Used for) Operating Activities	57,212,000	10,358,000
Investing Activities
Construction Expenditures	(90,205,000)	(93,500,000)
Change in Advances to Affiliates, Net	(62,255,000)	0
Other Investing Activities	1,149,000	776,000
Net Cash Flows from (Used for) Investing Activities	(151,311,000)	(92,724,000)
Financing Activities
Issuance of Long-term Debt	248,792,000	49,975,000
Change in Advances from Affiliates, Net	(154,249,000)	33,347,000
Retirement of Long-term Debt	(106,000)	(102,000)
Principal Payments for Capital Lease Obligations	(995,000)	(941,000)
Other Financing Activities	729,000	566,000
Net Cash Flows from (Used for) Financing Activities	94,171,000	82,845,000
Net Increase (Decrease) in Cash and Cash Equivalents	72,000	479,000
Cash and Cash Equivalents at Beginning of Period	1,352,000	1,277,000
Cash and Cash Equivalents at End of Period	1,424,000	1,756,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	10,995,000	10,487,000
Net Cash Paid (Received) for Income Taxes	0	67,000
Noncash Acquisitions Under Capital Leases	908,000	904,000
Construction Expenditures Included in Current Liabilities as of March 31,	30,787,000	34,199,000
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	46,737,000	22,962,000
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	46,954,000	45,661,000
Deferred Income Taxes	18,745,000	11,351,000
Allowance for Equity Funds Used During Construction	(5,229,000)	(2,081,000)
Mark-to-Market of Risk Management Contracts	3,135,000	(825,000)
Property Taxes	(39,393,000)	(37,511,000)
Fuel Over/Under-Recovery, Net	2,836,000	(21,651,000)
Change in Other Noncurrent Assets	(549,000)	3,963,000
Change in Other Noncurrent Liabilities	(3,323,000)	2,914,000
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	26,001,000	13,614,000
Fuel, Materials and Supplies	(458,000)	5,102,000
Accounts Payable	(28,300,000)	(9,410,000)
Accrued Taxes, Net	43,136,000	42,596,000
Increase (Decrease) in Interest Payable, Net	(25,487,000)	(25,431,000)
Other Current Assets	(11,384,000)	(4,663,000)
Other Current Liabilities	(44,068,000)	(18,123,000)
Net Cash Flows from (Used for) Operating Activities	29,353,000	28,468,000
Investing Activities
Construction Expenditures	(138,110,000)	(105,165,000)
Change in Advances to Affiliates, Net	(252,345,000)	0
Other Investing Activities	(1,394,000)	1,046,000
Net Cash Flows from (Used for) Investing Activities	(391,849,000)	(104,119,000)
Financing Activities
Issuance of Long-term Debt	446,057,000	0
Change in Advances from Affiliates, Net	0	108,162,000
Retirement of Long-term Debt	(55,125,000)	(1,625,000)
Principal Payments for Capital Lease Obligations	(4,510,000)	(4,470,000)
Dividends Paid on Common Stock	(30,000,000)	(25,000,000)
Dividends Paid on Common Stock	(1,062,000)	(1,236,000)
Other Financing Activities	755,000	574,000
Net Cash Flows from (Used for) Financing Activities	356,115,000	76,405,000
Net Increase (Decrease) in Cash and Cash Equivalents	(6,381,000)	754,000
Cash and Cash Equivalents at Beginning of Period	14,356,000	17,241,000
Cash and Cash Equivalents at End of Period	7,975,000	17,995,000
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	53,390,000	55,123,000
Net Cash Paid (Received) for Income Taxes	(938,000)	734,000
Noncash Acquisitions Under Capital Leases	926,000	2,824,000
Construction Expenditures Included in Current Liabilities as of March 31,	$ 80,185,000	$ 53,628,000

Future cash outflow to pay for acquired nuclear fuel.

No definition available.

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Amortizations related to recoveries of pre-2012 deferred fuel balances are recovered by the Phase In Recover Rider. Amortizations related to recoveries of deferred capacity costs are recovered by the Retail Stability Rider ($1/MWH is the Distribution portion through 5/31/15).

+ References

No definition available.

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The expense charged against earnings for the periodic recognition of nuclear fuel usage.

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Income recorded to accrue a return on certain regulatory assets as granted by a regulator.

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No definition available.

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Change in investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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The increase (decrease) during the reporting period in regulatory assets.

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The increase (decrease) during the reporting period in regulatory liabilities.

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- Definition

The net cash inflow or outflow due to Cook Unit 1 & 2 refueling outage levelization.

+ References

No definition available.

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The increase (decrease) during the reporting period in amounts for the net under recovery of capacity deferrals related to the differential between $189/MW-day capacity cost and RPM (reliability pricing model) pricing.

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No definition available.

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Future cash inflow for nuclear fuel dry cask storage reimbursement from the DOE.

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No definition available.

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The net change during the reporting period in the value of the asset (liability) created by an (over) under recovery of fuel costs. An over recovery represents the excess of fuel revenues billed to customers over fuel costs incurred and an under recovery represents excess fuel costs incurred over fuel revenues billed to customers.

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The amount of amortization charged against earnings during the period for deferred property taxes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The increase during the period in capital lease obligations due to entering into new capital leases.

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- Definition

The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 835

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 835

-Section 25

-Paragraph 1

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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- Definition

Amount of operating expense for depreciation and amortization of regulated operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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