Condensed Consolidated Statements of Cash Flows $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2022 USD ($)
Operating Activities
Net Income (Loss)	$ 916.5	$ 1,238.9
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	1,517.1	1,595.0
Deferred Income Taxes	135.8	21.4
Allowance for Equity Funds Used During Construction	(72.3)	(59.6)
Mark-to-Market of Risk Management Contracts	(124.7)	431.4
Property Taxes	202.7	191.6
Deferred Fuel Over/Under-Recovery, Net	342.5	(599.5)
Change in Other Noncurrent Assets	(375.5)	(49.3)
Change in Other Noncurrent Liabilities	(55.4)	144.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	277.8	(445.8)
Fuel, Materials and Supplies	(315.1)	(110.5)
Accounts Payable	62.6	484.8
Accrued Taxes, Net	(433.7)	(218.2)
Other Current Assets	(76.6)	69.9
Other Current Liabilities	(232.1)	158.1
Net Cash Flows from (Used for) Operating Activities	1,881.6	2,990.7
Investing Activities
Construction Expenditures	(4,049.7)	(3,138.1)
Purchases of Investment Securities	(1,235.6)	(1,254.8)
Sales of Investment Securities	1,206.3	1,244.9
Acquisitions of Nuclear Fuel	(73.9)	(67.7)
Proceeds from Sale of Property, Plant, and Equipment	1.0	208.5
Other Investing Activities	32.1	15.5
Net Cash Flows from (Used for) Investing Activities	(4,265.5)	(4,199.0)
Financing Activities
Issuance of Common Stock	77.6	812.7
Issuance of Long-term Debt	3,958.8	2,639.1
Issuance of Short-term Debt with Original Maturities greater than 90 Days	597.4	271.0
Change in Short-term Debt with Original Maturities less than 90 Days, Net	(688.2)	(268.9)
Retirement of Long-term Debt	(641.7)	(582.4)
Redemption of Short-term Debt with Original Maturities Greater than 90 Days	(153.8)	(486.1)
Principal Payments for Finance Leases Obligations	(40.6)	(106.2)
Dividends Paid on Common Stock	(863.6)	(803.5)
Other Financing Activities	(67.8)	(97.6)
Net Cash Flows from (Used for) Financing Activities	2,178.1	1,378.1
Net Increase (Decrease) in Cash and Cash Equivalents	(205.8)	169.8
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	556.5	451.4
Cash and Cash Equivalents at Beginning of Period	509.4
Cash, Cash Equivalents and Restricted Cash at End of Period	350.7	621.2
Cash and Cash Equivalents at End of Period	304.9
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	773.5	591.2
Net Cash Paid (Received) for Income Taxes	9.9	95.5
Noncash Acquisitions Under Finance Leases	25.6	13.7
Construction Expenditures Included in Current Liabilities as of March 31,	966.6	849.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	(36.0)	0.0
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
Kentucky Power Co [Member]
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Loss on the Expected Sale	$ 0.0	68.8
Flat Ridge II
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Impairment of Equity Method Investment	0.0	185.5
Competitive Contracted Renewable Portfolio
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Loss on the Expected Sale	112.0	0.0
Renewable Energy Facilities
Investing Activities
Acquisitions of Assets	(145.7)	(1,207.3)
AEP Texas Inc. [Member]
Operating Activities
Net Income (Loss)	156.7	159.6
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	225.9	225.0
Deferred Income Taxes	28.5	24.6
Allowance for Equity Funds Used During Construction	(11.6)	(8.0)
Mark-to-Market of Risk Management Contracts	0.4	(0.2)
Property Taxes	(60.0)	(54.8)
Change in Other Noncurrent Assets	(89.7)	(25.9)
Change in Other Noncurrent Liabilities	7.8	32.1
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(33.1)	(70.3)
Fuel, Materials and Supplies	(18.5)	(24.1)
Accounts Payable	1.9	17.9
Accrued Taxes, Net	50.2	34.0
Other Current Assets	2.9	(0.8)
Other Current Liabilities	(34.4)	31.9
Net Cash Flows from (Used for) Operating Activities	227.0	341.0
Investing Activities
Construction Expenditures	(834.2)	(647.6)
Change in Advances to Affiliates, Net	0.0	(634.0)
Other Investing Activities	20.2	22.3
Net Cash Flows from (Used for) Investing Activities	(814.0)	(1,259.3)
Financing Activities
Capital Contributions from Parent	275.3	1.3
Return of Capital to Parent Cash Flows	(4.3)	0.0
Issuance of Long-term Debt	445.9	1,188.6
Change in Advances from Affiliates, Net	39.4	(26.9)
Retirement of Long-term Debt	(168.2)	(242.0)
Principal Payments for Finance Leases Obligations	(3.7)	(3.4)
Other Financing Activities	0.6	0.0
Net Cash Flows from (Used for) Financing Activities	585.0	917.6
Net Increase (Decrease) in Cash and Cash Equivalents	(2.0)	(0.7)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	32.8	30.5
Cash and Cash Equivalents at Beginning of Period	0.1
Cash, Cash Equivalents and Restricted Cash at End of Period	30.8	29.8
Cash and Cash Equivalents at End of Period	0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	108.3	88.8
Net Cash Paid (Received) for Income Taxes	0.7	5.9
Noncash Acquisitions Under Finance Leases	2.6	3.0
Construction Expenditures Included in Current Liabilities as of March 31,	147.2	135.9
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	338.4	273.9
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	191.6	168.8
Deferred Income Taxes	42.7	37.3
Allowance for Equity Funds Used During Construction	(39.5)	(30.9)
Property Taxes	110.7	101.4
Provision for Refund Affiliated	13.1	56.4
Change in Other Noncurrent Assets	3.4	1.8
Change in Other Noncurrent Liabilities	1.7	44.3
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(104.1)	(36.7)
Fuel, Materials and Supplies	(4.8)	(2.2)
Accounts Payable	64.6	13.1
Accrued Taxes, Net	(133.3)	(107.6)
Other Current Assets	1.3	0.9
Other Current Liabilities	10.2	(0.9)
Net Cash Flows from (Used for) Operating Activities	482.9	463.2
Investing Activities
Construction Expenditures	(876.1)	(730.9)
Change in Advances to Affiliates, Net	(75.0)	(109.8)
Other Investing Activities	2.6	(8.0)
Net Cash Flows from (Used for) Investing Activities	(948.5)	(848.7)
Financing Activities
Capital Contributions from Parent	25.0	2.8
Return of Capital to Parent Cash Flows	(8.6)	0.0
Issuance of Long-term Debt	689.1	540.9
Change in Advances from Affiliates, Net	(154.9)	(68.2)
Dividends Paid on Common Stock	(85.0)	(90.0)
Net Cash Flows from (Used for) Financing Activities	465.6	385.5
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	82.8	74.0
Net Cash Paid (Received) for Income Taxes	32.0	39.7
Construction Expenditures Included in Current Liabilities as of March 31,	238.4	228.7
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	155.4	210.4
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	281.1	288.1
Deferred Income Taxes	(2.8)	17.1
Allowance for Equity Funds Used During Construction	(5.1)	(4.6)
Mark-to-Market of Risk Management Contracts	27.4	(38.5)
Deferred Fuel Over/Under-Recovery, Net	54.2	(312.1)
Change in Other Noncurrent Assets	7.7	(42.3)
Change in Other Noncurrent Liabilities	(39.3)	(0.2)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	60.4	65.4
Fuel, Materials and Supplies	(113.4)	(75.4)
Increase (Decrease) in Margin Deposits Outstanding	(11.7)	64.5
Accounts Payable	(128.7)	162.8
Accrued Taxes, Net	13.4	(5.7)
Other Current Assets	5.1	0.7
Other Current Liabilities	(20.8)	(0.7)
Net Cash Flows from (Used for) Operating Activities	282.9	329.5
Investing Activities
Construction Expenditures	(558.2)	(450.8)
Change in Advances to Affiliates, Net	0.9	1.4
Other Investing Activities	2.7	23.3
Net Cash Flows from (Used for) Investing Activities	(554.6)	(426.1)
Financing Activities
Capital Contributions from Parent	4.3	2.8
Issuance of Long-term Debt	200.0	103.3
Change in Advances from Affiliates, Net	83.9	149.9
Retirement of Long-term Debt	(13.0)	(117.1)
Principal Payments for Finance Leases Obligations	(4.1)	(4.0)
Dividends Paid on Common Stock	0.0	(37.5)
Other Financing Activities	0.6	0.2
Net Cash Flows from (Used for) Financing Activities	271.7	97.6
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	1.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	21.9	20.1
Cash and Cash Equivalents at Beginning of Period	7.5
Cash, Cash Equivalents and Restricted Cash at End of Period	21.9	21.1
Cash and Cash Equivalents at End of Period	6.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	125.9	104.9
Net Cash Paid (Received) for Income Taxes	23.4	1.0
Noncash Acquisitions Under Finance Leases	1.7	0.5
Construction Expenditures Included in Current Liabilities as of March 31,	139.6	121.2
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	177.6	156.7
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	236.2	268.6
Deferred Income Taxes	(1.9)	0.3
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expenses, Net	36.7	(38.3)
Allowance for Equity Funds Used During Construction	(2.8)	(5.4)
Mark-to-Market of Risk Management Contracts	(13.7)	(11.6)
Amortization of Nuclear Fuel	50.2	39.0
Deferred Fuel Over/Under-Recovery, Net	29.6	(17.5)
Change in Other Noncurrent Assets	(7.0)	3.3
Change in Other Noncurrent Liabilities	(4.6)	22.2
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	37.3	24.0
Fuel, Materials and Supplies	(52.7)	4.5
Accounts Payable	46.8	13.6
Accrued Taxes, Net	(3.0)	(2.4)
Other Current Assets	(3.6)	15.2
Other Current Liabilities	(23.4)	(20.1)
Net Cash Flows from (Used for) Operating Activities	501.7	452.1
Investing Activities
Construction Expenditures	(267.1)	(262.5)
Change in Advances to Affiliates, Net	(17.5)	(1.0)
Purchases of Investment Securities	(1,233.3)	(1,253.2)
Sales of Investment Securities	1,206.3	1,229.9
Acquisitions of Nuclear Fuel	(73.9)	(67.7)
Other Investing Activities	3.3	3.0
Net Cash Flows from (Used for) Investing Activities	(382.2)	(351.5)
Financing Activities
Capital Contributions from Parent	0.1	1.3
Issuance of Long-term Debt	494.9	72.8
Change in Advances from Affiliates, Net	(249.9)	(42.8)
Retirement of Long-term Debt	(299.2)	(40.7)
Principal Payments for Finance Leases Obligations	(3.8)	(40.1)
Dividends Paid on Common Stock	(62.5)	(50.0)
Other Financing Activities	0.5	0.4
Net Cash Flows from (Used for) Financing Activities	(119.9)	(99.1)
Net Increase (Decrease) in Cash and Cash Equivalents	(0.4)	1.5
Cash and Cash Equivalents at Beginning of Period	4.2	1.3
Cash and Cash Equivalents at End of Period	3.8	2.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	62.1	59.2
Net Cash Paid (Received) for Income Taxes	13.8	(4.9)
Noncash Acquisitions Under Finance Leases	3.2	0.4
Construction Expenditures Included in Current Liabilities as of March 31,	78.1	68.2
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	(36.0)	0.0
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	145.7	158.0
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	143.4	146.2
Deferred Income Taxes	7.1	13.8
Allowance for Equity Funds Used During Construction	(5.7)	(6.4)
Mark-to-Market of Risk Management Contracts	14.3	(44.3)
Property Taxes	193.9	178.6
Change in Other Noncurrent Assets	(88.0)	(53.1)
Change in Other Noncurrent Liabilities	(37.7)	44.3
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	8.2	(35.8)
Fuel, Materials and Supplies	(2.5)	(10.1)
Accounts Payable	30.8	78.2
Increase (Decrease) in Contract with Customer, Liability	(37.0)	142.5
Accrued Taxes, Net	(289.9)	(246.8)
Other Current Assets	2.3	12.2
Other Current Liabilities	(15.3)	35.6
Net Cash Flows from (Used for) Operating Activities	69.6	412.9
Investing Activities
Construction Expenditures	(547.7)	(376.4)
Change in Advances to Affiliates, Net	0.0	(14.0)
Other Investing Activities	11.1	12.6
Net Cash Flows from (Used for) Investing Activities	(536.6)	(377.8)
Financing Activities
Capital Contributions from Parent	175.0	0.7
Issuance of Long-term Debt	395.1	0.0
Change in Advances from Affiliates, Net	(100.6)	0.0
Retirement of Long-term Debt	(0.6)	(0.1)
Principal Payments for Finance Leases Obligations	(2.4)	(2.4)
Dividends Paid on Common Stock	0.0	(30.0)
Other Financing Activities	0.6	0.6
Net Cash Flows from (Used for) Financing Activities	467.1	(31.2)
Net Increase (Decrease) in Cash and Cash Equivalents	0.1	3.9
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	9.6	3.0
Cash and Cash Equivalents at Beginning of Period	9.6
Cash, Cash Equivalents and Restricted Cash at End of Period	9.7	6.9
Cash and Cash Equivalents at End of Period	9.7
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	57.6	56.8
Net Cash Paid (Received) for Income Taxes	9.2	21.4
Noncash Acquisitions Under Finance Leases	2.1	1.2
Construction Expenditures Included in Current Liabilities as of March 31,	87.4	92.9
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	48.7	48.8
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	126.0	113.2
Deferred Income Taxes	13.1	(20.4)
Allowance for Equity Funds Used During Construction	(2.9)	(1.3)
Mark-to-Market of Risk Management Contracts	(19.3)	(56.2)
Property Taxes	(27.9)	(24.4)
Deferred Fuel Over/Under-Recovery, Net	146.3	(124.2)
Change in Other Regulatory Assets	(57.3)	(4.8)
Change in Other Noncurrent Assets	(22.7)	(12.2)
Change in Other Noncurrent Liabilities	(0.6)	10.4
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(25.0)	(30.6)
Fuel, Materials and Supplies	(2.6)	(10.8)
Accounts Payable	75.2	123.7
Accrued Taxes, Net	8.9	23.9
Other Current Assets	5.3	(16.8)
Other Current Liabilities	(8.4)	9.9
Net Cash Flows from (Used for) Operating Activities	256.8	37.8
Investing Activities
Construction Expenditures	(263.6)	(200.2)
Acquisitions of Assets	(146.0)
Other Investing Activities	1.1	2.3
Net Cash Flows from (Used for) Investing Activities	(408.2)	(747.2)
Financing Activities
Capital Contributions from Parent	0.0	2.2
Return of Capital to Parent Cash Flows	(2.5)	0.0
Issuance of Long-term Debt	469.8	500.0
Change in Advances from Affiliates, Net	(296.1)	211.1
Retirement of Long-term Debt	(0.3)	(0.3)
Principal Payments for Finance Leases Obligations	(1.7)	(1.6)
Dividends Paid on Common Stock	(17.5)	0.0
Other Financing Activities	0.3	0.3
Net Cash Flows from (Used for) Financing Activities	152.0	711.7
Net Increase (Decrease) in Cash and Cash Equivalents	0.6	2.3
Cash and Cash Equivalents at Beginning of Period	4.0	1.3
Cash and Cash Equivalents at End of Period	4.6	3.6
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	37.6	38.1
Net Cash Paid (Received) for Income Taxes	(6.1)	12.2
Noncash Acquisitions Under Finance Leases	1.2	1.1
Construction Expenditures Included in Current Liabilities as of March 31,	83.6	41.6
Public Service Co Of Oklahoma [Member] | Renewable Energy Facilities
Investing Activities
Acquisitions of Assets	(145.7)	(549.3)
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)	123.1	123.9
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	166.2	156.0
Deferred Income Taxes	28.0	(1.4)
Allowance for Equity Funds Used During Construction	(3.0)	(2.4)
Mark-to-Market of Risk Management Contracts	(11.1)	(36.6)
Property Taxes	(49.3)	(44.0)
Deferred Fuel Over/Under-Recovery, Net	103.6	(53.6)
Change in Regulatory Assets	(43.8)	0.3
Change in Other Noncurrent Assets	5.0	45.1
Change in Other Noncurrent Liabilities	(22.4)	10.4
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(4.3)	(34.7)
Fuel, Materials and Supplies	(12.2)	8.7
Accounts Payable	81.2	46.2
Accrued Taxes, Net	39.7	41.3
Other Current Assets	20.5	(7.7)
Other Current Liabilities	(36.5)	(34.0)
Net Cash Flows from (Used for) Operating Activities	384.7	217.5
Investing Activities
Construction Expenditures	(429.6)	(247.0)
Change in Advances to Affiliates, Net	(0.1)	153.8
Acquisitions of Assets	0.0	658.0
Other Investing Activities	0.8	3.2
Net Cash Flows from (Used for) Investing Activities	(428.9)	(748.0)
Financing Activities
Capital Contributions from Parent	50.0	352.2
Issuance of Long-term Debt	346.8	0.0
Change in Short-term Debt with Original Maturities less than 90 Days, Net	3.9	0.0
Change in Advances from Affiliates, Net	(278.1)	213.2
Retirement of Long-term Debt	(94.1)	(3.1)
Principal Payments for Finance Leases Obligations	(16.2)	(5.4)
Dividends Paid on Common Stock	(50.0)	(12.5)
Dividends Paid on Common Stock	(2.1)	(1.5)
Other Financing Activities	0.2	0.1
Net Cash Flows from (Used for) Financing Activities	(39.6)	543.0
Net Increase (Decrease) in Cash and Cash Equivalents	(83.8)	12.5
Cash and Cash Equivalents at Beginning of Period	88.4	51.2
Cash and Cash Equivalents at End of Period	4.6	63.7
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	48.7	63.6
Net Cash Paid (Received) for Income Taxes	(17.1)	20.1
Noncash Acquisitions Under Finance Leases	2.6	2.8
Construction Expenditures Included in Current Liabilities as of March 31,	$ 85.7	$ 63.3