Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net Income (Loss)	$ 2,309.9	$ 1,874.8
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	2,461.7	2,309.4
Deferred Income Taxes	89.5	171.5
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	(153.0)	(123.4)
Mark-to-Market of Risk Management Contracts	(97.6)	(82.8)
Property Taxes	(508.3)	(486.1)
Deferred Fuel Over/Under-Recovery, Net	304.6	542.8
Change in Other Noncurrent Assets	(244.0)	(396.8)
Change in Other Noncurrent Liabilities	193.8	(21.5)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(131.8)	114.0
Fuel, Materials and Supplies	188.5	(344.4)
Accounts Payable	14.2	(163.0)
Accrued Taxes, Net	(532.3)	(566.7)
Other Current Assets	(139.2)	(91.5)
Other Current Liabilities	161.8	(144.8)
Net Cash Flows from (Used for) Operating Activities	5,076.9	3,675.7
Investing Activities
Construction Expenditures	(5,168.6)	(5,767.1)
Purchases of Investment Securities	(2,398.0)	(2,199.7)
Sales of Investment Securities	2,343.5	2,140.1
Acquisitions of Nuclear Fuel	(98.4)	(60.9)
Proceeds from Sale of Assets	365.0	1,335.6
Proceeds from Sale of Equity Method Investments	114.0	0.0
Other Investing Activities	73.0	62.5
Net Cash Flows from (Used for) Investing Activities	(4,769.5)	(4,643.5)
Financing Activities
Issuance of Common Stock	513.0	959.3
Issuance of Long-term Debt	3,748.5	4,017.8
Issuance of Short-term Debt with Original Maturities greater than 90 Days	376.6	791.7
Change in Short-term Debt with Original Maturities less than 90 Days, Net	(676.1)	(1,044.7)
Retirement of Long-term Debt	(1,969.1)	(1,353.3)
Redemption of Short-term Debt with Original Maturities Greater than 90 Days	(871.1)	(1,128.8)
Principal Payments for Finance Leases Obligations	(51.2)	(53.9)
Dividends Paid on Common Stock	(1,407.4)	(1,293.8)
Other Financing Activities	(50.4)	(75.9)
Net Cash Flows from (Used for) Financing Activities	(387.2)	818.4
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(79.8)	(149.4)
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	299.2	407.1
Cash and Cash Equivalents at End of Period	245.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	1,247.3	1,148.7
Net Cash Paid (Received) for Income Taxes	87.9	26.7
Cash Paid (Received) for Transferable Tax Credits	(163.7)	0.0
Noncash Acquisitions Under Finance Leases	24.5	38.5
Construction Expenditures Included in Current Liabilities as of September 30,	1,015.1	975.0
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	8.2	9.5
Renewable Energy Facilities
Investing Activities
Acquisitions of Renewable Energy Facilities	0.0	(154.0)
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)	340.6	282.2
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	368.3	351.5
Deferred Income Taxes	70.3	64.2
Allowance for Equity Funds Used During Construction	(34.6)	(19.4)
Change in Other Noncurrent Assets	(99.3)	(118.0)
Change in Other Noncurrent Liabilities	32.0	26.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(67.8)	(81.8)
Fuel, Materials and Supplies	11.8	(32.1)
Accounts Payable	23.6	0.7
Accrued Taxes, Net	56.0	39.7
Other Current Assets	(9.1)	(0.7)
Other Current Liabilities	43.8	(9.9)
Net Cash Flows from (Used for) Operating Activities	735.6	503.1
Investing Activities
Construction Expenditures	(1,042.4)	(1,175.1)
Change in Advances to Affiliates, Net	(54.7)	(42.1)
Other Investing Activities	44.2	42.2
Net Cash Flows from (Used for) Investing Activities	(1,052.9)	(1,175.0)
Financing Activities
Capital Contributions from Parent	1.6	525.8
Return of Capital to Parent	(0.7)	(4.3)
Issuance of Long-term Debt	841.9	505.4
Change in Advances from Affiliates, Net	(103.7)	(96.5)
Retirement of Long-term Debt	(256.5)	(240.0)
Principal Payments for Finance Leases Obligations	(5.6)	(5.5)
Dividends Paid on Common Stock	(150.0)	0.0
Other Financing Activities	1.4	1.2
Net Cash Flows from (Used for) Financing Activities	328.4	686.1
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	11.1	14.2
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	45.2	47.0
Cash and Cash Equivalents at End of Period	0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	132.8	135.9
Net Cash Paid (Received) for Income Taxes	(2.7)	4.3
Noncash Acquisitions Under Finance Leases	3.6	3.7
Construction Expenditures Included in Current Liabilities as of September 30,	167.3	153.6
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	548.2	517.6
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	320.8	291.2
Deferred Income Taxes	75.7	64.2
Allowance for Equity Funds Used During Construction	(64.7)	(62.2)
Property Taxes	(196.3)	(184.4)
Provision for Refund Affiliated	31.1	17.9
Change in Other Noncurrent Assets	0.8	5.8
Change in Other Noncurrent Liabilities	(40.1)	7.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	5.4	(37.1)
Fuel, Materials and Supplies	0.0	10.4
Accounts Payable	(16.1)	25.0
Accrued Taxes, Net	(149.9)	(202.2)
Other Current Assets	(1.9)	(1.0)
Other Current Liabilities	22.2	21.7
Net Cash Flows from (Used for) Operating Activities	896.7	825.5
Investing Activities
Construction Expenditures	(1,042.9)	(1,224.9)
Change in Advances to Affiliates, Net	(114.7)	(86.2)
Other Investing Activities	13.6	4.8
Net Cash Flows from (Used for) Investing Activities	(1,144.0)	(1,306.3)
Financing Activities
Capital Contributions from Parent	34.6	27.9
Return of Capital to Parent	(4.5)	(8.6)
Issuance of Long-term Debt	445.7	689.0
Change in Advances from Affiliates, Net	(131.5)	(112.5)
Dividends Paid on Common Stock	(97.0)	(115.0)
Net Cash Flows from (Used for) Financing Activities	247.3	480.8
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	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	128.0	116.9
Net Cash Paid (Received) for Income Taxes	5.7	55.0
Construction Expenditures Included in Current Liabilities as of September 30,	221.3	219.2
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	304.6	247.3
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	444.5	424.8
Deferred Income Taxes	(23.0)	5.2
Allowance for Equity Funds Used During Construction	(11.4)	(8.7)
Mark-to-Market of Risk Management Contracts	(33.6)	21.7
Deferred Fuel Over/Under-Recovery, Net	124.1	108.2
Change in Other Noncurrent Assets	(13.1)	24.4
Change in Other Noncurrent Liabilities	5.6	(29.9)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	3.6	80.2
Fuel, Materials and Supplies	62.2	(114.0)
Accounts Payable	50.4	(129.5)
Accrued Taxes, Net	12.8	(12.4)
Other Current Assets	(24.7)	(6.5)
Other Current Liabilities	34.8	(0.6)
Net Cash Flows from (Used for) Operating Activities	936.8	610.2
Investing Activities
Construction Expenditures	(708.7)	(813.4)
Change in Advances to Affiliates, Net	0.0	0.5
Other Investing Activities	14.4	(2.9)
Net Cash Flows from (Used for) Investing Activities	(694.3)	(815.8)
Financing Activities
Capital Contributions from Parent	109.5	6.5
Return of Capital to Parent	(4.5)	0.0
Issuance of Long-term Debt	480.8	200.0
Change in Advances from Affiliates, Net	(338.7)	20.3
Retirement of Long-term Debt	(413.5)	(26.5)
Principal Payments for Finance Leases Obligations	(6.5)	(6.2)
Dividends Paid on Common Stock	(75.0)	0.0
Other Financing Activities	0.3	1.0
Net Cash Flows from (Used for) Financing Activities	(247.6)	195.1
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(5.1)	(10.5)
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	14.8	11.4
Cash and Cash Equivalents at End of Period	6.5
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	159.6	166.6
Net Cash Paid (Received) for Income Taxes	27.4	40.3
Cash Paid (Received) for Transferable Tax Credits	(0.2)	0.0
Noncash Acquisitions Under Finance Leases	0.9	4.1
Construction Expenditures Included in Current Liabilities as of September 30,	129.9	138.7
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	359.3	270.6
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	359.2	352.9
Deferred Income Taxes	(70.7)	(16.4)
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	(3.2)	44.3
Allowance for Equity Funds Used During Construction	(10.1)	(6.6)
Mark-to-Market of Risk Management Contracts	16.3	(4.7)
Amortization of Nuclear Fuel	74.3	75.7
Deferred Fuel Over/Under-Recovery, Net	(13.7)	52.9
Change in Other Noncurrent Assets	24.4	3.1
Change in Other Noncurrent Liabilities	49.5	9.0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(8.1)	82.5
Fuel, Materials and Supplies	13.8	(42.7)
Accounts Payable	(57.7)	(34.8)
Accrued Taxes, Net	(56.1)	(25.3)
Other Current Assets	(2.0)	(3.4)
Other Current Liabilities	(10.2)	(22.7)
Net Cash Flows from (Used for) Operating Activities	678.4	734.4
Investing Activities
Construction Expenditures	(434.7)	(418.4)
Change in Advances to Affiliates, Net	0.0	1.8
Purchases of Investment Securities	(2,389.0)	(2,182.8)
Sales of Investment Securities	2,336.0	2,139.3
Acquisitions of Nuclear Fuel	(98.4)	(60.9)
Other Investing Activities	5.7	4.9
Net Cash Flows from (Used for) Investing Activities	(580.4)	(516.1)
Financing Activities
Capital Contributions from Parent	5.0	1.7
Return of Capital to Parent	(1.8)	0.0
Issuance of Long-term Debt	80.4	494.8
Change in Advances from Affiliates, Net	13.7	(249.9)
Retirement of Long-term Debt	(76.1)	(324.1)
Principal Payments for Finance Leases Obligations	(5.2)	(5.4)
Dividends Paid on Common Stock	(112.5)	(137.5)
Other Financing Activities	0.5	0.6
Net Cash Flows from (Used for) Financing Activities	(96.0)	(219.8)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	2.0	(1.5)
Cash and Cash Equivalents at Beginning of Period	2.1	4.2
Cash and Cash Equivalents at End of Period	4.1	2.7
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	111.5	100.1
Net Cash Paid (Received) for Income Taxes	(4.4)	36.2
Noncash Acquisitions Under Finance Leases	1.1	3.6
Construction Expenditures Included in Current Liabilities as of September 30,	69.6	70.6
Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30,	8.2	9.5
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	201.7	226.2
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	293.9	224.7
Deferred Income Taxes	0.2	29.4
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	(16.2)	(11.3)
Mark-to-Market of Risk Management Contracts	0.9	11.6
Property Taxes	(286.6)	(282.4)
Change in Other Noncurrent Assets	19.2	(95.5)
Change in Other Noncurrent Liabilities	47.2	(47.7)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(39.8)	4.3
Fuel, Materials and Supplies	33.8	5.3
Accounts Payable	(43.4)	1.8
Customer Deposits	6.1	(37.3)
Accrued Taxes, Net	(322.3)	(367.3)
Other Current Assets	(11.9)	(2.3)
Other Current Liabilities	17.2	0.4
Net Cash Flows from (Used for) Operating Activities	526.1	224.7
Investing Activities
Construction Expenditures	(688.5)	(769.0)
Change in Advances to Affiliates, Net	(97.4)	0.0
Other Investing Activities	29.4	33.9
Net Cash Flows from (Used for) Investing Activities	(756.5)	(735.1)
Financing Activities
Capital Contributions from Parent	0.8	175.0
Issuance of Long-term Debt	346.3	395.0
Change in Advances from Affiliates, Net	(110.5)	(59.6)
Retirement of Long-term Debt	0.0	(0.6)
Principal Payments for Finance Leases Obligations	(4.0)	(3.7)
Other Financing Activities	1.0	1.5
Net Cash Flows from (Used for) Financing Activities	233.6	507.6
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	3.2	(2.8)
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	9.6	6.8
Cash and Cash Equivalents at End of Period	9.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	82.8	76.5
Net Cash Paid (Received) for Income Taxes	(5.1)	16.0
Noncash Acquisitions Under Finance Leases	1.1	3.3
Construction Expenditures Included in Current Liabilities as of September 30,	126.8	99.6
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	222.0	188.1
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	202.1	187.8
Deferred Income Taxes	(12.7)	(13.6)
Allowance for Equity Funds Used During Construction	(4.6)	(5.3)
Mark-to-Market of Risk Management Contracts	(27.9)	(0.2)
Property Taxes	(14.8)	(14.0)
Deferred Fuel Over/Under-Recovery, Net	90.9	263.3
Change in Other Regulatory Assets	5.0	(66.1)
Change in Other Noncurrent Assets	(24.4)	(27.8)
Change in Other Noncurrent Liabilities	0.8	11.0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	33.3	11.9
Fuel, Materials and Supplies	12.2	(11.6)
Accounts Payable	9.6	(19.5)
Accrued Taxes, Net	54.0	(9.5)
Other Current Assets	(15.3)	(3.0)
Other Current Liabilities	(67.0)	(10.8)
Net Cash Flows from (Used for) Operating Activities	463.2	480.7
Investing Activities
Construction Expenditures	(402.9)	(401.1)
Change in Advances to Affiliates, Net	0.0	(9.2)
Other Investing Activities	5.1	8.8
Net Cash Flows from (Used for) Investing Activities	(397.8)	(547.2)
Financing Activities
Capital Contributions from Parent	0.2	0.6
Return of Capital to Parent	0.0	(2.5)
Issuance of Long-term Debt	0.0	469.8
Change in Advances from Affiliates, Net	44.1	(364.2)
Retirement of Long-term Debt	(0.4)	(0.4)
Principal Payments for Finance Leases Obligations	(2.5)	(2.5)
Dividends Paid on Common Stock	(105.0)	(35.0)
Other Financing Activities	0.5	0.4
Net Cash Flows from (Used for) Financing Activities	(63.1)	66.2
Net Increase (Decrease) in Cash and Cash Equivalents	2.3	(0.3)
Cash and Cash Equivalents at Beginning of Period	2.5	4.0
Cash and Cash Equivalents at End of Period	4.8	3.7
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	86.4	67.4
Net Cash Paid (Received) for Income Taxes	(27.2)	(1.6)
Cash Paid (Received) for Transferable Tax Credits	(76.9)	0.0
Noncash Acquisitions Under Finance Leases	1.2	1.9
Construction Expenditures Included in Current Liabilities as of September 30,	76.7	91.0
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)	280.6	282.1
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	297.6	266.8
Deferred Income Taxes	(117.1)	44.9
Allowance for Equity Funds Used During Construction	(9.7)	(7.3)
Mark-to-Market of Risk Management Contracts	(23.3)	1.4
Property Taxes	(23.7)	(24.6)
Deferred Fuel Over/Under-Recovery, Net	134.3	134.4
Change in Other Noncurrent Assets	(41.3)	(46.9)
Change in Other Noncurrent Liabilities	(46.0)	(26.7)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(2.4)	29.7
Fuel, Materials and Supplies	26.2	(12.0)
Accounts Payable	7.6	5.3
Accrued Taxes, Net	65.1	10.8
Other Current Assets	(7.0)	10.4
Other Current Liabilities	(51.5)	(40.6)
Net Cash Flows from (Used for) Operating Activities	649.4	627.7
Investing Activities
Construction Expenditures	(539.6)	(614.1)
Change in Advances to Affiliates, Net	(0.6)	(0.6)
Other Investing Activities	10.9	1.8
Net Cash Flows from (Used for) Investing Activities	(529.3)	(612.9)
Financing Activities
Capital Contributions from Parent	0.0	50.0
Return of Capital to Parent	(1.1)	0.0
Issuance of Long-term Debt	0.0	346.8
Change in Short-term Debt with Original Maturities less than 90 Days, Net	0.3	3.9
Change in Advances from Affiliates, Net	148.7	(261.8)
Retirement of Long-term Debt	0.0	(94.1)
Principal Payments for Finance Leases Obligations	(13.0)	(17.6)
Dividends Paid on Common Stock	(250.0)	(125.0)
Dividends Paid on Common Stock	(3.4)	(2.4)
Other Financing Activities	0.4	0.6
Net Cash Flows from (Used for) Financing Activities	(118.1)	(99.6)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	2.0	(84.8)
Cash and Cash Equivalents at Beginning of Period	2.4	88.4
Cash and Cash Equivalents at End of Period	4.4	3.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	107.1	89.8
Net Cash Paid (Received) for Income Taxes	(11.2)	(23.3)
Cash Paid (Received) for Transferable Tax Credits	(69.4)	0.0
Noncash Acquisitions Under Finance Leases	1.9	4.6
Construction Expenditures Included in Current Liabilities as of September 30,	84.9	69.0
Turk AFUDC Refunds [Member] | Southwestern Electric Power Co [Member]
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows from (Used for) Operating Activities:
Change in Other Noncurrent Liabilities	100.0	0.0
Changes in Certain Components of Working Capital:
Other Current Liabilities	60.0	0.0
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