Condensed Consolidated Statements of Cash Flows $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)
Operating Activities
Net Income (Loss)	$ 1,922.2	$ 1,949.5
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	2,416.8	2,103.9
Deferred Income Taxes	16.6	191.1
Other Asset Impairment Charges	24.9	0.0
Loss on the Expected Sale of the Kentucky Operations	24.9	0.0
Allowance for Equity Funds Used During Construction	(95.2)	(103.9)
Mark-to-Market of Risk Management Contracts	162.3	101.0
Property Taxes	459.9	415.1
Establishment of Regulatory Asset	(37.0)	0.0
Deferred Fuel Over/Under-Recovery, Net	(148.7)	(1,356.8)
Gain (Loss) on Disposition of Assets	(116.3)	0.0
Change in Other Noncurrent Assets	(6.0)	(108.0)
Change in Other Noncurrent Liabilities	324.0	162.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(495.7)	(199.2)
Fuel, Materials and Supplies	(134.6)	347.4
Accounts Payable	369.4	107.6
Accrued Taxes, Net	(512.8)	(471.1)
Other Current Assets	41.2	(33.3)
Other Current Liabilities	90.9	(133.0)
Net Cash Flows from (Used for) Operating Activities	4,733.2	2,973.0
Investing Activities
Construction Expenditures	(4,748.5)	(4,087.0)
Purchases of Investment Securities	(1,868.2)	(1,612.3)
Sales of Investment Securities	1,833.4	1,571.7
Acquisitions of Nuclear Fuel	(91.9)	(63.2)
Proceeds from Sale of Property, Plant, and Equipment	215.7	17.4
Other Investing Activities	44.3	34.4
Net Cash Flows from (Used for) Investing Activities	(5,822.5)	(4,906.2)
Financing Activities
Issuance of Common Stock	827.2	548.0
Issuance of Long-term Debt	3,428.4	5,062.3
Issuance of Short-term Debt with Original Maturities greater than 90 Days	271.0	1,178.5
Change in Short-term Debt with Original Maturities less than 90 Days, Net	803.4	(632.5)
Retirement of Long-term Debt	(1,679.1)	(1,549.8)
Redemption of Short-term Debt with Original Maturities Greater than 90 Days	(986.1)	(521.3)
Principal Payments for Finance Leases Obligations	(120.3)	(45.3)
Dividends Paid on Common Stock	(1,212.5)	(1,122.7)
Other Financing Activities	(116.8)	4.4
Net Cash Flows from (Used for) Financing Activities	1,215.2	2,921.6
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	125.9	988.4
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	451.4	438.3
Cash and Cash Equivalents at Beginning of Period	403.4
Cash, Cash Equivalents and Restricted Cash at End of Period	577.3	1,426.7
Cash and Cash Equivalents at End of Period	522.2
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	856.8	775.2
Net Cash Paid (Received) for Income Taxes	104.1	9.3
Lease Obligation Incurred	22.3	23.0
Construction Expenditures Included in Noncurrent Liabilities as of March 31,	985.8	764.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	8.5	0.3
Commitment from Bank Conduits to Finance Receivables	125.0
Commitment from Bank Conduits to Finance Receivables Two	$ 625.0
2020 Equity Units [Member] | Maximum [Member]
Supplementary Information
AEP Share Price for Equity Unit Conversion | $ / shares	$ 99.95
Dry Lake Solar Project
Investing Activities
Acquisitions of Assets	$ 0.0	(114.4)
Supplementary Information
Noncontrolling Interest Assumed - Dry Lake Solar Project	0.0	35.0
North Central Wind Energy Facilities
Investing Activities
Acquisitions of Assets	(1,207.3)	(652.8)
Mineral Rights
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Gain (Loss) on Disposition of Assets	(116.3)	0.0
Kentucky Power Co [Member]
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Loss on the Expected Sale of the Kentucky Operations	263.3	0.0
Flat Ridge II
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Impairment of Equity Method Investment	188.0	0.0
Cedar Creek Project
Supplementary Information
Noncash Contribution of Assets to Cedar Creek Project	0.0	(9.3)
AEP Texas Inc. [Member]
Operating Activities
Net Income (Loss)	253.2	225.4
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	342.7	287.1
Deferred Income Taxes	35.1	45.8
Allowance for Equity Funds Used During Construction	(13.2)	(16.7)
Mark-to-Market of Risk Management Contracts	(0.2)	0.0
Change in Other Noncurrent Assets	(48.4)	(73.4)
Change in Other Noncurrent Liabilities	49.2	17.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(57.5)	(40.2)
Fuel, Materials and Supplies	(39.9)	(2.5)
Accounts Payable	16.0	(10.9)
Accrued Taxes, Net	39.4	29.5
Other Current Assets	1.0	(2.0)
Other Current Liabilities	12.2	(5.0)
Net Cash Flows from (Used for) Operating Activities	589.6	454.6
Investing Activities
Construction Expenditures	(949.8)	(742.4)
Change in Advances to Affiliates, Net	(129.4)	(47.5)
Other Investing Activities	26.7	29.6
Net Cash Flows from (Used for) Investing Activities	(1,052.5)	(760.3)
Financing Activities
Capital Contributions from Parent	1.8	0.0
Issuance of Long-term Debt	1,188.7	444.2
Change in Advances from Affiliates, Net	(26.9)	(67.1)
Retirement of Long-term Debt	(678.6)	(52.2)
Principal Payments for Finance Leases Obligations	(5.1)	(5.0)
Other Financing Activities	0.3	1.0
Net Cash Flows from (Used for) Financing Activities	480.2	320.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	17.3	15.2
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	30.5	28.8
Cash and Cash Equivalents at Beginning of Period	0.1
Cash, Cash Equivalents and Restricted Cash at End of Period	47.8	44.0
Cash and Cash Equivalents at End of Period	0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	121.1	110.0
Net Cash Paid (Received) for Income Taxes	10.0	(8.4)
Noncash Acquisitions Under Finance Leases	4.1	3.3
Construction Expenditures Included in Current Liabilities as of March 31,	156.0	134.9
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	426.6	445.7
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	256.2	219.0
Deferred Income Taxes	60.6	46.8
Allowance for Equity Funds Used During Construction	(51.2)	(49.3)
Property Taxes	170.0	154.0
Provision for Refund Affiliated	65.7	17.7
Change in Other Noncurrent Assets	4.0	2.3
Change in Other Noncurrent Liabilities	55.0	8.3
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(66.4)	(23.6)
Fuel, Materials and Supplies	(2.4)	(0.5)
Accounts Payable	53.1	(10.7)
Accrued Taxes, Net	(194.0)	(138.8)
Other Current Assets	(1.2)	0.5
Other Current Liabilities	27.2	22.7
Net Cash Flows from (Used for) Operating Activities	737.5	676.4
Investing Activities
Construction Expenditures	(1,059.3)	(1,070.8)
Change in Advances to Affiliates, Net	(84.1)	29.9
Other Investing Activities	(5.3)	(7.9)
Net Cash Flows from (Used for) Investing Activities	(1,148.7)	(1,048.8)
Financing Activities
Capital Contributions from Parent	64.2	184.0
Issuance of Long-term Debt	540.9	443.7
Change in Advances from Affiliates, Net	(63.9)	(142.8)
Dividends Paid on Common Stock	(130.0)	(112.5)
Net Cash Flows from (Used for) Financing Activities	411.2	372.4
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	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	88.6	75.8
Net Cash Paid (Received) for Income Taxes	53.2	37.6
Construction Expenditures Included in Current Liabilities as of March 31,	240.5	206.8
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	303.1	275.1
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	431.0	406.6
Deferred Income Taxes	70.7	(12.0)
Other Asset Impairment Charges	24.9	0.0
Loss on the Expected Sale of the Kentucky Operations	24.9	0.0
Allowance for Equity Funds Used During Construction	(6.8)	(12.1)
Mark-to-Market of Risk Management Contracts	(65.6)	(26.8)
Establishment of Regulatory Asset	(37.0)	0.0
Deferred Fuel Over/Under-Recovery, Net	(400.2)	(43.9)
Change in Other Noncurrent Assets	(15.2)	(39.2)
Change in Other Noncurrent Liabilities	39.7	20.2
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	68.7	38.1
Fuel, Materials and Supplies	(61.7)	126.3
Increase (Decrease) in Margin Deposits Outstanding	65.8	(15.8)
Accounts Payable	141.4	26.5
Accrued Taxes, Net	(98.9)	(48.0)
Other Current Assets	(4.2)	(4.9)
Other Current Liabilities	42.2	0.5
Net Cash Flows from (Used for) Operating Activities	497.9	690.6
Investing Activities
Construction Expenditures	(707.4)	(586.4)
Change in Advances to Affiliates, Net	(161.3)	(163.8)
Other Investing Activities	34.9	12.4
Net Cash Flows from (Used for) Investing Activities	(833.8)	(737.8)
Financing Activities
Capital Contributions from Parent	4.3	0.0
Issuance of Long-term Debt	698.2	494.0
Change in Advances from Affiliates, Net	(199.3)	(18.6)
Retirement of Long-term Debt	(130.4)	(393.0)
Principal Payments for Finance Leases Obligations	(5.9)	(5.8)
Dividends Paid on Common Stock	(37.5)	(37.5)
Other Financing Activities	0.5	0.5
Net Cash Flows from (Used for) Financing Activities	329.9	39.6
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(6.0)	(7.6)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	20.1	22.7
Cash and Cash Equivalents at Beginning of Period	2.5
Cash, Cash Equivalents and Restricted Cash at End of Period	14.1	15.1
Cash and Cash Equivalents at End of Period	6.7
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	128.3	124.2
Net Cash Paid (Received) for Income Taxes	14.2	52.6
Noncash Acquisitions Under Finance Leases	1.0	1.3
Construction Expenditures Included in Current Liabilities as of March 31,	160.4	92.3
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	250.8	232.1
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	400.2	328.7
Rockport Plant, Unit 2 Operating Lease Amortization	0.0	51.1
Deferred Income Taxes	(15.8)	(36.6)
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expenses, Net	(35.2)	(2.5)
Allowance for Equity Funds Used During Construction	(7.9)	(9.7)
Mark-to-Market of Risk Management Contracts	(13.2)	0.5
Amortization of Nuclear Fuel	63.1	61.9
Deferred Fuel Over/Under-Recovery, Net	(20.5)	(18.0)
Change in Other Noncurrent Assets	12.5	7.3
Change in Other Noncurrent Liabilities	42.1	(10.2)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	5.3	18.2
Fuel, Materials and Supplies	3.1	43.0
Accounts Payable	19.6	20.1
Accrued Taxes, Net	(17.0)	(20.3)
Operating Lease, Payments	0.0	(36.9)
Other Current Assets	19.3	(0.7)
Other Current Liabilities	(63.6)	(28.0)
Net Cash Flows from (Used for) Operating Activities	642.8	600.0
Investing Activities
Construction Expenditures	(407.4)	(370.2)
Change in Advances to Affiliates, Net	(1.1)	(67.3)
Purchases of Investment Securities	(1,854.8)	(1,586.3)
Sales of Investment Securities	1,818.4	1,556.6
Acquisitions of Nuclear Fuel	(91.9)	(63.2)
Other Investing Activities	8.0	12.9
Net Cash Flows from (Used for) Investing Activities	(528.8)	(517.5)
Financing Activities
Capital Contributions from Parent	1.9	0.0
Issuance of Long-term Debt	72.8	507.0
Change in Advances from Affiliates, Net	11.6	(103.0)
Retirement of Long-term Debt	(64.5)	(307.2)
Principal Payments for Finance Leases Obligations	(41.6)	(4.9)
Dividends Paid on Common Stock	(70.0)	(175.0)
Other Financing Activities	0.3	0.5
Net Cash Flows from (Used for) Financing Activities	(89.5)	(82.6)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	24.5	(0.1)
Cash and Cash Equivalents at Beginning of Period	1.3	3.3
Cash and Cash Equivalents at End of Period	25.8	3.2
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	101.6	93.9
Net Cash Paid (Received) for Income Taxes	(4.1)	11.8
Noncash Acquisitions Under Finance Leases	0.8	3.1
Construction Expenditures Included in Current Liabilities as of March 31,	68.1	59.0
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	8.5	0.3
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	229.9	198.6
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	216.9	228.6
Deferred Income Taxes	29.3	29.3
Carrying Costs Income	(0.2)	(1.1)
Allowance for Equity Funds Used During Construction	(10.3)	(7.6)
Mark-to-Market of Risk Management Contracts	(49.6)	(19.9)
Property Taxes	264.7	234.9
Change in Other Noncurrent Assets	(19.7)	(1.1)
Change in Other Noncurrent Liabilities	82.5	4.6
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(27.0)	20.7
Fuel, Materials and Supplies	(11.6)	(0.6)
Accounts Payable	87.6	(19.1)
Increase (Decrease) in Contract with Customer, Liability	37.4	68.4
Accrued Taxes, Net	(344.5)	(289.7)
Other Current Assets	11.3	(7.8)
Other Current Liabilities	25.7	5.8
Net Cash Flows from (Used for) Operating Activities	522.6	445.1
Investing Activities
Construction Expenditures	(600.6)	(536.6)
Change in Advances to Affiliates, Net	42.0	(622.9)
Other Investing Activities	21.3	10.7
Net Cash Flows from (Used for) Investing Activities	(537.3)	(1,148.8)
Financing Activities
Capital Contributions from Parent	1.0	0.0
Issuance of Long-term Debt	0.0	1,037.5
Change in Advances from Affiliates, Net	68.8	(259.2)
Retirement of Long-term Debt	(0.1)	(0.1)
Principal Payments for Finance Leases Obligations	(3.6)	(3.7)
Dividends Paid on Common Stock	(45.0)	(71.9)
Other Financing Activities	0.8	0.5
Net Cash Flows from (Used for) Financing Activities	21.9	703.1
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	7.2	(0.6)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	3.0	7.4
Cash and Cash Equivalents at Beginning of Period	3.0
Cash, Cash Equivalents and Restricted Cash at End of Period	10.2	6.8
Cash and Cash Equivalents at End of Period	10.2
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	75.8	78.6
Net Cash Paid (Received) for Income Taxes	24.2	0.3
Noncash Acquisitions Under Finance Leases	2.1	1.4
Construction Expenditures Included in Current Liabilities as of March 31,	108.3	66.5
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	155.7	136.6
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	172.7	149.0
Deferred Income Taxes	(20.0)	109.8
Mark-to-Market of Risk Management Contracts	(36.1)	(8.2)
Property Taxes	(12.2)	(10.9)
Deferred Fuel Over/Under-Recovery, Net	454.0	(776.4)
Change in Other Noncurrent Assets	(18.1)	(14.3)
Change in Other Noncurrent Liabilities	15.8	4.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(66.3)	(13.4)
Fuel, Materials and Supplies	(25.8)	9.9
Accounts Payable	150.8	16.4
Accrued Taxes, Net	(20.9)	9.3
Other Current Assets	(19.2)	(5.9)
Other Current Liabilities	11.0	(18.4)
Net Cash Flows from (Used for) Operating Activities	741.4	(412.0)
Investing Activities
Construction Expenditures	(322.6)	(219.6)
Change in Advances to Affiliates, Net	0.0	(59.5)
Acquisitions of Assets	549.3	297.0
Other Investing Activities	2.9	1.9
Net Cash Flows from (Used for) Investing Activities	(869.0)	(574.2)
Financing Activities
Capital Contributions from Parent	3.3	625.0
Issuance of Long-term Debt	499.7	1,290.0
Change in Advances from Affiliates, Net	151.2	(155.4)
Retirement of Long-term Debt	(500.4)	(750.4)
Principal Payments for Finance Leases Obligations	(2.4)	(2.5)
Dividends Paid on Common Stock	(20.0)	(20.0)
Other Financing Activities	0.4	0.5
Net Cash Flows from (Used for) Financing Activities	131.8	987.2
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	4.2	1.0
Cash and Cash Equivalents at Beginning of Period	1.3	2.6
Cash and Cash Equivalents at End of Period	5.5	3.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	63.1	42.9
Net Cash Paid (Received) for Income Taxes	21.9	(101.2)
Noncash Acquisitions Under Finance Leases	1.7	3.1
Construction Expenditures Included in Current Liabilities as of March 31,	50.1	44.2
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	263.3	210.7
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	251.8	217.4
Deferred Income Taxes	7.5	22.5
Allowance for Equity Funds Used During Construction	(3.4)	(5.4)
Mark-to-Market of Risk Management Contracts	(27.6)	(18.1)
Property Taxes	(22.0)	(20.0)
Deferred Fuel Over/Under-Recovery, Net	(82.0)	(506.8)
Change in Regulatory Assets	3.1	(91.5)
Change in Other Noncurrent Assets	52.0	38.3
Change in Other Noncurrent Liabilities	17.3	40.0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(17.9)	(70.2)
Fuel, Materials and Supplies	23.5	115.1
Accounts Payable	78.9	(21.1)
Accrued Taxes, Net	(1.1)	72.2
Other Current Assets	(12.0)	4.2
Other Current Liabilities	(38.1)	(48.2)
Net Cash Flows from (Used for) Operating Activities	493.3	(60.9)
Investing Activities
Construction Expenditures	(397.0)	(277.2)
Change in Advances to Affiliates, Net	153.8	0.0
Acquisitions of Assets	658.0	355.8
Other Investing Activities	3.9	2.1
Net Cash Flows from (Used for) Investing Activities	(897.3)	(630.9)
Financing Activities
Capital Contributions from Parent	353.3	280.0
Issuance of Long-term Debt	0.0	496.4
Change in Short-term Debt with Original Maturities less than 90 Days, Net	0.0	(35.0)
Change in Advances from Affiliates, Net	156.3	(1.7)
Retirement of Long-term Debt	(4.7)	(4.7)
Principal Payments for Finance Leases Obligations	(8.0)	(8.1)
Dividends Paid on Common Stock	(57.5)	0.0
Dividends Paid on Common Stock	(2.6)	(3.8)
Other Financing Activities	0.4	0.5
Net Cash Flows from (Used for) Financing Activities	437.2	723.6
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	33.2	31.8
Cash and Cash Equivalents at Beginning of Period	51.2	13.2
Cash and Cash Equivalents at End of Period	84.4	45.0
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	102.1	98.0
Net Cash Paid (Received) for Income Taxes	34.7	(11.3)
Noncash Acquisitions Under Finance Leases	3.2	4.4
Construction Expenditures Included in Current Liabilities as of March 31,	$ 71.8	$ 46.8