Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities
Net Income (Loss)	$ 1,348.2	$ 916.5
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	1,609.0	1,517.1
Deferred Income Taxes	(56.1)	135.8
Asset Impairments and Other Related Charges	142.5	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio	142.5	0.0
Allowance for Equity Funds Used During Construction	(98.8)	(72.3)
Mark-to-Market of Risk Management Contracts	(75.0)	(124.7)
Property Taxes	213.2	202.7
Deferred Fuel Over/Under-Recovery, Net	120.0	342.5
Change in Other Noncurrent Assets	(131.0)	(375.5)
Change in Other Noncurrent Liabilities	189.9	(55.4)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(209.3)	277.8
Fuel, Materials and Supplies	111.3	(315.1)
Accounts Payable	77.0	62.6
Accrued Taxes, Net	(301.3)	(433.7)
Other Current Assets	(144.0)	(76.6)
Other Current Liabilities	108.6	(232.1)
Net Cash Flows from (Used for) Operating Activities	2,904.2	1,881.6
Investing Activities
Construction Expenditures	(3,318.3)	(4,049.7)
Purchases of Investment Securities	(1,190.1)	(1,235.6)
Sales of Investment Securities	1,157.1	1,206.3
Acquisitions of Nuclear Fuel	(69.8)	(73.9)
Proceeds from Sale of Equity Method Investments	114.0	0.0
Other Investing Activities	57.4	33.1
Net Cash Flows from (Used for) Investing Activities	(3,249.7)	(4,265.5)
Financing Activities
Issuance of Common Stock	475.8	77.6
Issuance of Long-term Debt	3,663.3	3,958.8
Issuance of Short-term Debt with Original Maturities greater than 90 Days	376.6	597.4
Change in Short-term Debt with Original Maturities less than 90 Days, Net	(860.0)	(688.2)
Retirement of Long-term Debt	(1,769.1)	(641.7)
Redemption of Short-term Debt with Original Maturities Greater than 90 Days	(665.1)	(153.8)
Principal Payments for Finance Leases Obligations	(35.8)	(40.6)
Dividends Paid on Common Stock	(936.0)	(863.6)
Other Financing Activities	(35.3)	(67.8)
Net Cash Flows from (Used for) Financing Activities	214.4	2,178.1
Net Increase (Decrease) in Cash and Cash Equivalents	(131.1)	(205.8)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	379.0	556.5
Cash and Cash Equivalents at Beginning of Period	330.1
Cash, Cash Equivalents and Restricted Cash at End of Period	247.9	350.7
Cash and Cash Equivalents at End of Period	202.5
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	881.0	773.5
Net Cash Paid (Received) for Income Taxes	60.8	9.9
Cash Paid (Received) for Transferable Tax Credits	(72.2)	0.0
Noncash Acquisitions Under Finance Leases	20.5	25.6
Construction Expenditures Included in Current Liabilities as of June 30,	1,049.9	966.6
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	8.2	(36.0)
Renewable Energy Facilities
Investing Activities
Acquisitions of Renewable Energy Facilities	0.0	(145.7)
Competitive Contracted Renewable Portfolio
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Loss on the Sale of the Competitive Contracted Renewables Portfolio	0.0	112.0
Competitive Contracted Renewable Portfolio
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Loss on the Sale of the Competitive Contracted Renewables Portfolio	0.0	112.0
AEP Texas Inc. [Member]
Operating Activities
Net Income (Loss)	208.1	156.7
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	241.6	225.9
Deferred Income Taxes	45.1	28.5
Allowance for Equity Funds Used During Construction	(24.1)	(11.6)
Mark-to-Market of Risk Management Contracts	0.0	0.4
Property Taxes	(53.5)	(60.0)
Change in Other Noncurrent Assets	(57.0)	(89.7)
Change in Other Noncurrent Liabilities	19.7	7.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(73.1)	(33.1)
Fuel, Materials and Supplies	5.0	(18.5)
Accounts Payable	26.0	1.9
Accrued Taxes, Net	43.6	50.2
Other Current Assets	0.0	2.9
Other Current Liabilities	4.7	(34.4)
Net Cash Flows from (Used for) Operating Activities	386.1	227.0
Investing Activities
Construction Expenditures	(665.3)	(834.2)
Change in Advances to Affiliates, Net	(251.1)	0.0
Other Investing Activities	32.8	20.2
Net Cash Flows from (Used for) Investing Activities	(883.6)	(814.0)
Financing Activities
Capital Contributions from Parent	1.6	275.3
Return of Capital to Parent	0.0	(4.3)
Issuance of Long-term Debt	841.9	445.9
Change in Advances from Affiliates, Net	(103.7)	39.4
Retirement of Long-term Debt	(244.5)	(168.2)
Principal Payments for Finance Leases Obligations	(3.7)	(3.7)
Other Financing Activities	1.3	0.6
Net Cash Flows from (Used for) Financing Activities	492.9	585.0
Net Increase (Decrease) in Cash and Cash Equivalents	(4.6)	(2.0)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	34.1	32.8
Cash and Cash Equivalents at Beginning of Period	0.1
Cash, Cash Equivalents and Restricted Cash at End of Period	29.5	30.8
Cash and Cash Equivalents at End of Period	0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	111.0	108.3
Net Cash Paid (Received) for Income Taxes	(5.4)	0.7
Noncash Acquisitions Under Finance Leases	2.1	2.6
Construction Expenditures Included in Current Liabilities as of June 30,	191.3	147.2
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	356.9	338.4
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	212.6	191.6
Deferred Income Taxes	49.4	42.7
Allowance for Equity Funds Used During Construction	(40.4)	(39.5)
Property Taxes	116.2	110.7
Provision for Refund Affiliated	22.6	13.1
Change in Other Noncurrent Assets	0.0	3.4
Change in Other Noncurrent Liabilities	(28.9)	1.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(23.8)	(104.1)
Fuel, Materials and Supplies	(0.2)	(4.8)
Accounts Payable	(6.5)	64.6
Accrued Taxes, Net	(65.3)	(133.3)
Other Current Assets	0.5	1.3
Other Current Liabilities	2.6	10.2
Net Cash Flows from (Used for) Operating Activities	573.1	482.9
Investing Activities
Construction Expenditures	(657.8)	(876.1)
Change in Advances to Affiliates, Net	(208.1)	(75.0)
Other Investing Activities	11.3	2.6
Net Cash Flows from (Used for) Investing Activities	(854.6)	(948.5)
Financing Activities
Capital Contributions from Parent	34.6	25.0
Return of Capital to Parent	0.0	(8.6)
Issuance of Long-term Debt	445.7	689.1
Change in Advances from Affiliates, Net	(127.8)	(154.9)
Dividends Paid on Common Stock	(71.0)	(85.0)
Net Cash Flows from (Used for) Financing Activities	281.5	465.6
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	0.0
Cash and Cash Equivalents at Beginning of Period	0.0	0.0
Cash and Cash Equivalents at End of Period	0.0	0.0
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	96.9	82.8
Net Cash Paid (Received) for Income Taxes	(12.5)	32.0
Construction Expenditures Included in Current Liabilities as of June 30,	237.9	238.4
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	194.8	155.4
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	295.5	281.1
Deferred Income Taxes	(27.4)	(2.8)
Allowance for Equity Funds Used During Construction	(7.2)	(5.1)
Mark-to-Market of Risk Management Contracts	(54.4)	27.4
Deferred Fuel Over/Under-Recovery, Net	81.2	54.2
Change in Other Noncurrent Assets	0.5	7.7
Change in Other Noncurrent Liabilities	5.9	(39.3)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(32.2)	60.4
Fuel, Materials and Supplies	45.4	(113.4)
Increase (Decrease) in Margin Deposits Outstanding	(12.4)	(11.7)
Accounts Payable	66.4	(128.7)
Accrued Taxes, Net	41.6	13.4
Other Current Assets	2.3	5.1
Other Current Liabilities	10.8	(20.8)
Net Cash Flows from (Used for) Operating Activities	610.8	282.9
Investing Activities
Construction Expenditures	(443.5)	(558.2)
Change in Advances to Affiliates, Net	(23.6)	0.9
Other Investing Activities	9.1	2.7
Net Cash Flows from (Used for) Investing Activities	(458.0)	(554.6)
Financing Activities
Capital Contributions from Parent	109.5	4.3
Issuance of Long-term Debt	480.8	200.0
Change in Advances from Affiliates, Net	(339.6)	83.9
Retirement of Long-term Debt	(399.5)	(13.0)
Principal Payments for Finance Leases Obligations	(4.4)	(4.1)
Other Financing Activities	0.4	0.6
Net Cash Flows from (Used for) Financing Activities	(152.8)	271.7
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	19.9	21.9
Cash and Cash Equivalents at Beginning of Period	5.0
Cash, Cash Equivalents and Restricted Cash at End of Period	19.9	21.9
Cash and Cash Equivalents at End of Period	4.0
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	126.6	125.9
Net Cash Paid (Received) for Income Taxes	9.6	23.4
Cash Paid (Received) for Transferable Tax Credits	(0.1)	0.0
Noncash Acquisitions Under Finance Leases	0.7	1.7
Construction Expenditures Included in Current Liabilities as of June 30,	143.7	139.6
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	180.2	177.6
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	226.6	236.2
Deferred Income Taxes	(69.8)	(1.9)
Asset Impairments and Other Related Charges	13.4	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio	13.4	0.0
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expenses, Net	(20.5)	36.7
Allowance for Equity Funds Used During Construction	(6.7)	(2.8)
Mark-to-Market of Risk Management Contracts	9.5	(13.7)
Amortization of Nuclear Fuel	46.1	50.2
Deferred Fuel Over/Under-Recovery, Net	(9.5)	29.6
Change in Other Noncurrent Assets	10.2	(7.0)
Change in Other Noncurrent Liabilities	29.3	(4.6)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(0.1)	37.3
Fuel, Materials and Supplies	8.6	(52.7)
Accounts Payable	(7.5)	(25.2)
Accrued Taxes, Net	36.1	(3.0)
Other Current Assets	(8.8)	(3.6)
Other Current Liabilities	(10.8)	(23.4)
Net Cash Flows from (Used for) Operating Activities	426.3	429.7
Investing Activities
Construction Expenditures	(275.0)	(267.1)
Change in Advances to Affiliates, Net	0.0	(17.5)
Purchases of Investment Securities	(1,187.1)	(1,233.3)
Sales of Investment Securities	1,154.1	1,206.3
Acquisitions of Nuclear Fuel	(69.8)	(1.9)
Other Investing Activities	3.7	3.3
Net Cash Flows from (Used for) Investing Activities	(374.1)	(310.2)
Financing Activities
Capital Contributions from Parent	5.0	0.1
Issuance of Long-term Debt	80.4	494.9
Change in Advances from Affiliates, Net	(10.7)	(249.9)
Retirement of Long-term Debt	(48.6)	(299.2)
Principal Payments for Finance Leases Obligations	(3.6)	(3.8)
Dividends Paid on Common Stock	(75.0)	(62.5)
Other Financing Activities	0.6	0.5
Net Cash Flows from (Used for) Financing Activities	(51.9)	(119.9)
Net Increase (Decrease) in Cash and Cash Equivalents	0.3	(0.4)
Cash and Cash Equivalents at Beginning of Period	2.1	4.2
Cash and Cash Equivalents at End of Period	2.4	3.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	72.8	62.1
Net Cash Paid (Received) for Income Taxes	(14.5)	13.8
Noncash Acquisitions Under Finance Leases	1.0	3.2
Construction Expenditures Included in Current Liabilities as of June 30,	86.2	78.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	8.2	36.0
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	89.0	145.7
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	207.8	143.4
Deferred Income Taxes	(10.2)	7.1
Asset Impairments and Other Related Charges	52.9	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio	52.9	0.0
Allowance for Equity Funds Used During Construction	(9.8)	(5.7)
Mark-to-Market of Risk Management Contracts	(7.5)	14.3
Property Taxes	190.8	193.9
Change in Other Noncurrent Assets	4.8	(88.0)
Change in Other Noncurrent Liabilities	18.4	(37.7)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(80.4)	8.2
Fuel, Materials and Supplies	9.7	(2.5)
Accounts Payable	(47.2)	30.8
Customer Deposits	39.0	(37.0)
Accrued Taxes, Net	(207.1)	(289.9)
Other Current Assets	(4.9)	2.3
Other Current Liabilities	11.1	(15.3)
Net Cash Flows from (Used for) Operating Activities	256.4	69.6
Investing Activities
Construction Expenditures	(455.8)	(547.7)
Change in Advances to Affiliates, Net	(49.9)	0.0
Other Investing Activities	15.3	11.1
Net Cash Flows from (Used for) Investing Activities	(490.4)	(536.6)
Financing Activities
Capital Contributions from Parent	0.0	175.0
Issuance of Long-term Debt	346.3	395.1
Change in Advances from Affiliates, Net	(110.5)	(100.6)
Retirement of Long-term Debt	0.0	(0.6)
Principal Payments for Finance Leases Obligations	(2.7)	(2.4)
Other Financing Activities	0.8	0.6
Net Cash Flows from (Used for) Financing Activities	233.9	467.1
Net Increase (Decrease) in Cash and Cash Equivalents	(0.1)	0.1
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	6.4	9.6
Cash and Cash Equivalents at Beginning of Period	6.4
Cash, Cash Equivalents and Restricted Cash at End of Period	6.3	9.7
Cash and Cash Equivalents at End of Period	6.3
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	64.6	57.6
Net Cash Paid (Received) for Income Taxes	(13.0)	9.2
Noncash Acquisitions Under Finance Leases	0.8	2.1
Construction Expenditures Included in Current Liabilities as of June 30,	112.9	87.4
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	108.3	48.7
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	131.5	126.0
Deferred Income Taxes	8.2	13.1
Allowance for Equity Funds Used During Construction	(3.3)	(2.9)
Mark-to-Market of Risk Management Contracts	(37.5)	(19.3)
Property Taxes	(29.7)	(27.9)
Deferred Fuel Over/Under-Recovery, Net	(13.8)	146.3
Change in Other Regulatory Assets	(4.2)	(57.3)
Change in Other Noncurrent Assets	(13.7)	(22.7)
Change in Other Noncurrent Liabilities	(6.2)	(0.6)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(21.4)	(25.0)
Fuel, Materials and Supplies	(3.7)	(2.6)
Accounts Payable	109.8	75.2
Accrued Taxes, Net	(7.9)	8.9
Other Current Assets	(27.4)	5.3
Other Current Liabilities	(52.2)	(8.4)
Net Cash Flows from (Used for) Operating Activities	136.8	256.8
Investing Activities
Construction Expenditures	(270.8)	(263.6)
Other Investing Activities	(2.2)	1.1
Net Cash Flows from (Used for) Investing Activities	(273.0)	(408.2)
Financing Activities
Capital Contributions from Parent	0.2	0.0
Return of Capital to Parent	0.0	(2.5)
Issuance of Long-term Debt	0.0	469.8
Change in Advances from Affiliates, Net	207.4	(296.1)
Retirement of Long-term Debt	(0.3)	(0.3)
Principal Payments for Finance Leases Obligations	(1.7)	(1.7)
Dividends Paid on Common Stock	(70.0)	(17.5)
Other Financing Activities	0.6	0.3
Net Cash Flows from (Used for) Financing Activities	136.2	152.0
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	0.6
Cash and Cash Equivalents at Beginning of Period	2.5	4.0
Cash and Cash Equivalents at End of Period	2.5	4.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	51.6	37.6
Net Cash Paid (Received) for Income Taxes	(3.0)	(6.1)
Cash Paid (Received) for Transferable Tax Credits	(29.6)	0.0
Noncash Acquisitions Under Finance Leases	0.8	1.2
Construction Expenditures Included in Current Liabilities as of June 30,	61.8	83.6
Public Service Co Of Oklahoma [Member] | Renewable Energy Facilities
Investing Activities
Acquisitions of Renewable Energy Facilities	0.0	(145.7)
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	140.5	123.1
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	179.9	166.2
Deferred Income Taxes	(136.2)	28.0
Allowance for Equity Funds Used During Construction	(6.8)	(3.0)
Mark-to-Market of Risk Management Contracts	(31.1)	(11.1)
Property Taxes	(47.4)	(49.3)
Deferred Fuel Over/Under-Recovery, Net	82.7	103.6
Change in Other Noncurrent Assets	(12.8)	(38.8)
Change in Other Noncurrent Liabilities	(40.1)	(22.4)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(43.0)	(4.3)
Fuel, Materials and Supplies	22.1	(12.2)
Accounts Payable	60.2	81.2
Accrued Taxes, Net	19.7	39.7
Other Current Assets	(26.0)	20.5
Other Current Liabilities	(10.8)	(36.5)
Net Cash Flows from (Used for) Operating Activities	310.9	384.7
Investing Activities
Construction Expenditures	(347.7)	(429.6)
Change in Advances to Affiliates, Net	(0.6)	(0.1)
Other Investing Activities	0.9	0.8
Net Cash Flows from (Used for) Investing Activities	(347.4)	(428.9)
Financing Activities
Capital Contributions from Parent	0.0	50.0
Issuance of Long-term Debt	0.0	346.8
Change in Short-term Debt with Original Maturities less than 90 Days, Net	1.4	3.9
Change in Advances from Affiliates, Net	196.7	(278.1)
Retirement of Long-term Debt	0.0	(94.1)
Principal Payments for Finance Leases Obligations	(9.8)	(16.2)
Dividends Paid on Common Stock	(150.0)	(50.0)
Dividends Paid on Common Stock	(2.4)	(2.1)
Other Financing Activities	0.6	0.2
Net Cash Flows from (Used for) Financing Activities	36.5	(39.6)
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	(83.8)
Cash and Cash Equivalents at Beginning of Period	2.4	88.4
Cash and Cash Equivalents at End of Period	2.4	4.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	71.6	48.7
Net Cash Paid (Received) for Income Taxes	14.9	(17.1)
Cash Paid (Received) for Transferable Tax Credits	(25.4)	0.0
Noncash Acquisitions Under Finance Leases	1.3	2.6
Construction Expenditures Included in Current Liabilities as of June 30,	93.1	85.7
Southwestern Electric Power Co [Member] | Turk AFUDC Refunds [Member]
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Change in Other Noncurrent Liabilities	133.3	0.0
Changes in Certain Components of Working Capital:
Other Current Liabilities	$ 26.7	$ 0.0