Condensed Consolidated Statements of Cash Flows $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Operating Activities
Net Income (Loss)	$ 1,874.8	$ 1,922.2
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	2,309.4	2,416.8
Deferred Income Taxes	171.5	16.6
Other Asset Impairment Charges	0.0	24.9
Loss on the Expected/Completed Sale	0.0	24.9
Allowance for Equity Funds Used During Construction	(123.4)	(95.2)
Mark-to-Market of Risk Management Contracts	(82.8)	162.3
Property Taxes	486.1	459.9
Establishment of Regulatory Asset	0.0	(37.0)
Deferred Fuel Over/Under-Recovery, Net	542.8	(148.7)
Change in Other Noncurrent Assets	(396.8)	(6.0)
Change in Other Noncurrent Liabilities	(21.5)	324.0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	114.0	(495.7)
Fuel, Materials and Supplies	(344.4)	(134.6)
Accounts Payable	(163.0)	369.4
Accrued Taxes, Net	(566.7)	(512.8)
Other Current Assets	(91.5)	41.2
Other Current Liabilities	(144.8)	90.9
Net Cash Flows from (Used for) Operating Activities	3,675.7	4,733.2
Investing Activities
Construction Expenditures	(5,767.1)	(4,748.5)
Purchases of Investment Securities	(2,199.7)	(1,868.2)
Sales of Investment Securities	2,140.1	1,833.4
Acquisitions of Nuclear Fuel	(60.9)	(91.9)
Proceeds from Sale of Property, Plant, and Equipment	1,335.6	215.7
Other Investing Activities	62.5	44.3
Net Cash Flows from (Used for) Investing Activities	(4,643.5)	(5,822.5)
Financing Activities
Issuance of Common Stock	959.3	827.2
Issuance of Long-term Debt	4,017.8	3,428.4
Issuance of Short-term Debt with Original Maturities greater than 90 Days	791.7	271.0
Change in Short-term Debt with Original Maturities less than 90 Days, Net	(1,044.7)	803.4
Retirement of Long-term Debt	(1,353.3)	(1,679.1)
Redemption of Short-term Debt with Original Maturities Greater than 90 Days	(1,128.8)	(986.1)
Principal Payments for Finance Leases Obligations	(53.9)	(120.3)
Dividends Paid on Common Stock	(1,293.8)	(1,212.5)
Other Financing Activities	(75.9)	(116.8)
Net Cash Flows from (Used for) Financing Activities	818.4	1,215.2
Net Increase (Decrease) in Cash and Cash Equivalents	(149.4)	125.9
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	407.1	577.3
Cash and Cash Equivalents at End of Period	353.3
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	1,148.7	856.8
Net Cash Paid (Received) for Income Taxes	26.7	104.1
Noncash Acquisitions Under Finance Leases	38.5	22.3
Construction Expenditures Included in Noncurrent Liabilities as of September 30,	975.0	985.8
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	9.5	8.5
Commitment from Bank Conduits to Finance Receivables	750.0
2020 Equity Units [Member]
Financing Activities
Issuance of Common Stock	850.0
Mineral Rights
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Gain on Sale of Mineral Rights	0.0	(116.3)
Kentucky Power Co [Member]
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Loss on the Expected/Completed Sale	0.0	263.3
Flat Ridge II
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Impairment of Equity Method Investment	0.0	188.0
Competitive Contracted Renewable Portfolio
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Loss on the Expected/Completed Sale	112.0	0.0
Renewable Energy Facilities
Investing Activities
Acquisitions of Assets	(154.0)	(1,207.3)
AEP Texas Inc. [Member]
Operating Activities
Net Income (Loss)	282.2	253.2
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	351.5	342.7
Deferred Income Taxes	64.2	35.1
Allowance for Equity Funds Used During Construction	(19.4)	(13.2)
Mark-to-Market of Risk Management Contracts	0.0	(0.2)
Change in Other Noncurrent Assets	(118.0)	(48.4)
Change in Other Noncurrent Liabilities	26.7	49.2
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(81.8)	(57.5)
Fuel, Materials and Supplies	(32.1)	(39.9)
Accounts Payable	0.7	16.0
Accrued Taxes, Net	39.7	39.4
Other Current Assets	(0.7)	1.0
Other Current Liabilities	(9.9)	12.2
Net Cash Flows from (Used for) Operating Activities	503.1	589.6
Investing Activities
Construction Expenditures	(1,175.1)	(949.8)
Change in Advances to Affiliates, Net	(42.1)	(129.4)
Other Investing Activities	42.2	26.7
Net Cash Flows from (Used for) Investing Activities	(1,175.0)	(1,052.5)
Financing Activities
Capital Contributions from Parent	525.8	1.8
Return of Capital to Parent Cash Flows	(4.3)	0.0
Issuance of Long-term Debt	505.4	1,188.7
Change in Advances from Affiliates, Net	(96.5)	(26.9)
Retirement of Long-term Debt	(240.0)	(678.6)
Principal Payments for Finance Leases Obligations	(5.5)	(5.1)
Other Financing Activities	1.2	0.3
Net Cash Flows from (Used for) Financing Activities	686.1	480.2
Net Increase (Decrease) in Cash and Cash Equivalents	14.2	17.3
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	47.0	47.8
Cash and Cash Equivalents at End of Period	0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	135.9	121.1
Net Cash Paid (Received) for Income Taxes	4.3	10.0
Noncash Acquisitions Under Finance Leases	3.7	4.1
Construction Expenditures Included in Current Liabilities as of September 30,	153.6	156.0
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	517.6	426.6
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	291.2	256.2
Deferred Income Taxes	64.2	60.6
Allowance for Equity Funds Used During Construction	(62.2)	(51.2)
Property Taxes	184.4	170.0
Provision for Refund Affiliated	17.9	65.7
Change in Other Noncurrent Assets	5.8	4.0
Change in Other Noncurrent Liabilities	7.7	55.0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(37.1)	(66.4)
Fuel, Materials and Supplies	10.4	(2.4)
Accounts Payable	25.0	53.1
Accrued Taxes, Net	(202.2)	(194.0)
Other Current Assets	(1.0)	(1.2)
Other Current Liabilities	21.7	27.2
Net Cash Flows from (Used for) Operating Activities	825.5	737.5
Investing Activities
Construction Expenditures	(1,224.9)	(1,059.3)
Change in Advances to Affiliates, Net	(86.2)	(84.1)
Other Investing Activities	4.8	(5.3)
Net Cash Flows from (Used for) Investing Activities	(1,306.3)	(1,148.7)
Financing Activities
Capital Contributions from Parent	27.9	64.2
Return of Capital to Parent Cash Flows	(8.6)	0.0
Issuance of Long-term Debt	689.0	540.9
Change in Advances from Affiliates, Net	(112.5)	(63.9)
Dividends Paid on Common Stock	(115.0)	(130.0)
Net Cash Flows from (Used for) Financing Activities	480.8	411.2
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	116.9	88.6
Net Cash Paid (Received) for Income Taxes	55.0	53.2
Construction Expenditures Included in Current Liabilities as of September 30,	219.2	240.5
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)	247.3	303.1
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	424.8	431.0
Deferred Income Taxes	5.2	70.7
Other Asset Impairment Charges	0.0	24.9
Loss on the Expected/Completed Sale	0.0	24.9
Allowance for Equity Funds Used During Construction	(8.7)	(6.8)
Mark-to-Market of Risk Management Contracts	21.7	(65.6)
Establishment of Regulatory Asset	0.0	(37.0)
Deferred Fuel Over/Under-Recovery, Net	108.2	(400.2)
Change in Other Noncurrent Assets	24.4	(15.2)
Change in Other Noncurrent Liabilities	(29.9)	39.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	80.2	68.7
Fuel, Materials and Supplies	(114.0)	(61.7)
Increase (Decrease) in Margin Deposits Outstanding	(3.0)	65.8
Accounts Payable	(129.5)	141.4
Accrued Taxes, Net	(12.4)	(98.9)
Other Current Assets	(3.5)	(4.2)
Other Current Liabilities	(0.6)	42.2
Net Cash Flows from (Used for) Operating Activities	610.2	497.9
Investing Activities
Construction Expenditures	(813.4)	(707.4)
Change in Advances to Affiliates, Net	0.5	(161.3)
Other Investing Activities	(2.9)	34.9
Net Cash Flows from (Used for) Investing Activities	(815.8)	(833.8)
Financing Activities
Capital Contributions from Parent	6.5	4.3
Issuance of Long-term Debt	200.0	698.2
Change in Advances from Affiliates, Net	20.3	(199.3)
Retirement of Long-term Debt	(26.5)	(130.4)
Principal Payments for Finance Leases Obligations	(6.2)	(5.9)
Dividends Paid on Common Stock	0.0	(37.5)
Other Financing Activities	1.0	0.5
Net Cash Flows from (Used for) Financing Activities	195.1	329.9
Net Increase (Decrease) in Cash and Cash Equivalents	(10.5)	(6.0)
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	11.4	14.1
Cash and Cash Equivalents at End of Period	4.5
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	166.6	128.3
Net Cash Paid (Received) for Income Taxes	40.3	14.2
Noncash Acquisitions Under Finance Leases	4.1	1.0
Construction Expenditures Included in Current Liabilities as of September 30,	138.7	160.4
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)	270.6	250.8
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	352.9	400.2
Deferred Income Taxes	(16.4)	(15.8)
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expenses, Net	44.3	(35.2)
Allowance for Equity Funds Used During Construction	(6.6)	(7.9)
Mark-to-Market of Risk Management Contracts	(4.7)	(13.2)
Amortization of Nuclear Fuel	75.7	63.1
Deferred Fuel Over/Under-Recovery, Net	52.9	(20.5)
Change in Other Noncurrent Assets	3.1	12.5
Change in Other Noncurrent Liabilities	9.0	42.1
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	82.5	5.3
Fuel, Materials and Supplies	(42.7)	3.1
Accounts Payable	(34.8)	19.6
Accrued Taxes, Net	(25.3)	(17.0)
Other Current Assets	(3.4)	19.3
Other Current Liabilities	(22.7)	(63.6)
Net Cash Flows from (Used for) Operating Activities	734.4	642.8
Investing Activities
Construction Expenditures	(418.4)	(407.4)
Change in Advances to Affiliates, Net	1.8	(1.1)
Purchases of Investment Securities	(2,182.8)	(1,854.8)
Sales of Investment Securities	2,139.3	1,818.4
Acquisitions of Nuclear Fuel	(60.9)	(91.9)
Other Investing Activities	4.9	8.0
Net Cash Flows from (Used for) Investing Activities	(516.1)	(528.8)
Financing Activities
Capital Contributions from Parent	1.7	1.9
Issuance of Long-term Debt	494.8	72.8
Change in Advances from Affiliates, Net	(249.9)	11.6
Retirement of Long-term Debt	(324.1)	(64.5)
Principal Payments for Finance Leases Obligations	(5.4)	(41.6)
Dividends Paid on Common Stock	(137.5)	(70.0)
Other Financing Activities	0.6	0.3
Net Cash Flows from (Used for) Financing Activities	(219.8)	(89.5)
Net Increase (Decrease) in Cash and Cash Equivalents	(1.5)	24.5
Cash and Cash Equivalents at Beginning of Period	4.2	1.3
Cash and Cash Equivalents at End of Period	2.7	25.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	100.1	101.6
Net Cash Paid (Received) for Income Taxes	36.2	(4.1)
Noncash Acquisitions Under Finance Leases	3.6	0.8
Construction Expenditures Included in Current Liabilities as of September 30,	70.6	68.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,	9.5	8.5
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)	226.2	229.9
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	224.7	216.9
Deferred Income Taxes	29.4	29.3
Allowance for Equity Funds Used During Construction	(11.3)	(10.3)
Mark-to-Market of Risk Management Contracts	11.6	(49.6)
Property Taxes	282.4	264.7
Change in Other Noncurrent Assets	(95.5)	(19.7)
Change in Other Noncurrent Liabilities	(47.7)	82.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	4.3	(27.0)
Fuel, Materials and Supplies	5.3	(11.6)
Accounts Payable	1.8	87.6
Increase (Decrease) in Contract with Customer, Liability	(37.3)	37.4
Accrued Taxes, Net	(367.3)	(344.5)
Other Current Assets	(2.3)	11.3
Other Current Liabilities	0.4	25.7
Net Cash Flows from (Used for) Operating Activities	224.7	522.6
Investing Activities
Construction Expenditures	(769.0)	(600.6)
Change in Advances to Affiliates, Net	0.0	42.0
Other Investing Activities	33.9	21.3
Net Cash Flows from (Used for) Investing Activities	(735.1)	(537.3)
Financing Activities
Capital Contributions from Parent	175.0	1.0
Issuance of Long-term Debt	395.0	0.0
Change in Advances from Affiliates, Net	(59.6)	68.8
Retirement of Long-term Debt	(0.6)	(0.1)
Principal Payments for Finance Leases Obligations	(3.7)	(3.6)
Dividends Paid on Common Stock	0.0	(45.0)
Other Financing Activities	1.5	0.8
Net Cash Flows from (Used for) Financing Activities	507.6	21.9
Net Increase (Decrease) in Cash and Cash Equivalents	(2.8)	7.2
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	6.8	10.2
Cash and Cash Equivalents at End of Period	6.8
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	76.5	75.8
Net Cash Paid (Received) for Income Taxes	16.0	24.2
Noncash Acquisitions Under Finance Leases	3.3	2.1
Construction Expenditures Included in Current Liabilities as of September 30,	99.6	108.3
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)	188.1	155.7
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	187.8	172.7
Deferred Income Taxes	(13.6)	(20.0)
Mark-to-Market of Risk Management Contracts	(0.2)	(36.1)
Property Taxes	(14.0)	(12.2)
Deferred Fuel Over/Under-Recovery, Net	263.3	454.0
Change in Other Regulatory Assets	(66.1)	3.7
Change in Other Noncurrent Assets	(33.1)	(21.8)
Change in Other Noncurrent Liabilities	11.0	15.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	11.9	(66.3)
Fuel, Materials and Supplies	(11.6)	(25.8)
Accounts Payable	(19.5)	150.8
Accrued Taxes, Net	(9.5)	(20.9)
Other Current Assets	(3.0)	(19.2)
Other Current Liabilities	(10.8)	11.0
Net Cash Flows from (Used for) Operating Activities	480.7	741.4
Investing Activities
Construction Expenditures	(401.1)	(322.6)
Change in Advances to Affiliates, Net	(9.2)	0.0
Acquisitions of Assets	(146.0)
Other Investing Activities	8.8	2.9
Net Cash Flows from (Used for) Investing Activities	(547.2)	(869.0)
Financing Activities
Capital Contributions from Parent	0.6	3.3
Return of Capital to Parent Cash Flows	(2.5)	0.0
Issuance of Long-term Debt	469.8	499.7
Change in Advances from Affiliates, Net	(364.2)	151.2
Retirement of Long-term Debt	(0.4)	(500.4)
Principal Payments for Finance Leases Obligations	(2.5)	(2.4)
Dividends Paid on Common Stock	(35.0)	(20.0)
Other Financing Activities	0.4	0.4
Net Cash Flows from (Used for) Financing Activities	66.2	131.8
Net Increase (Decrease) in Cash and Cash Equivalents	(0.3)	4.2
Cash and Cash Equivalents at Beginning of Period	4.0	1.3
Cash and Cash Equivalents at End of Period	3.7	5.5
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	67.4	63.1
Net Cash Paid (Received) for Income Taxes	(1.6)	21.9
Noncash Acquisitions Under Finance Leases	1.9	1.7
Construction Expenditures Included in Current Liabilities as of September 30,	91.0	50.1
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)	282.1	263.3
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization	266.8	251.8
Deferred Income Taxes	44.9	7.5
Allowance for Equity Funds Used During Construction	(7.3)	(3.4)
Mark-to-Market of Risk Management Contracts	1.4	(27.6)
Property Taxes	(24.6)	(22.0)
Deferred Fuel Over/Under-Recovery, Net	134.4	(82.0)
Change in Regulatory Assets	(36.7)	3.1
Change in Other Noncurrent Assets	(10.2)	52.0
Change in Other Noncurrent Liabilities	(26.7)	17.3
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	29.7	(17.9)
Fuel, Materials and Supplies	(12.0)	23.5
Accounts Payable	5.3	78.9
Accrued Taxes, Net	10.8	(1.1)
Other Current Assets	10.4	(12.0)
Other Current Liabilities	(40.6)	(38.1)
Net Cash Flows from (Used for) Operating Activities	627.7	493.3
Investing Activities
Construction Expenditures	(614.1)	(397.0)
Change in Advances to Affiliates, Net	(0.6)	153.8
Acquisitions of Assets	0.0	(658.0)
Other Investing Activities	1.8	3.9
Net Cash Flows from (Used for) Investing Activities	(612.9)	(897.3)
Financing Activities
Capital Contributions from Parent	50.0	353.3
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	(261.8)	156.3
Retirement of Long-term Debt	(94.1)	(4.7)
Principal Payments for Finance Leases Obligations	(17.6)	(8.0)
Dividends Paid on Common Stock	(125.0)	(57.5)
Dividends Paid on Common Stock	(2.4)	(2.6)
Other Financing Activities	0.6	0.4
Net Cash Flows from (Used for) Financing Activities	(99.6)	437.2
Net Increase (Decrease) in Cash and Cash Equivalents	(84.8)	33.2
Cash and Cash Equivalents at Beginning of Period	88.4	51.2
Cash and Cash Equivalents at End of Period	3.6	84.4
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts	89.8	102.1
Net Cash Paid (Received) for Income Taxes	(23.3)	34.7
Noncash Acquisitions Under Finance Leases	4.6	3.2
Construction Expenditures Included in Current Liabilities as of September 30,	$ 69.0	$ 71.8