FAIR VALUE MEASUREMENTS - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	$ 242.0	$ 258.5
Risk Management Assets
Risk Management Assets	555.9	499.5
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,309.3	4,395.1
Total Assets	5,107.2	5,153.1
Risk Management Liabilities
Total Risk Management Liabilities	330.9	324.4
AEP Texas
Other Temporary Investments and Restricted Cash
Restricted Cash	13.4	23.5
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
APCo
Other Temporary Investments and Restricted Cash
Restricted Cash	10.6	16.2
Risk Management Assets
Risk Management Assets	31.5	37.1
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	42.1	53.3
Risk Management Liabilities
Total Risk Management Liabilities	2.9	2.2
I&M
Risk Management Assets
Risk Management Assets	3.9	18.4
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	4,309.3	4,395.1
Total Assets	4,313.2	4,413.5
Risk Management Liabilities
Total Risk Management Liabilities	3.2	0.7
OPCo
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	51.2	47.5
PSO
Risk Management Assets
Risk Management Assets	34.2	22.0
Risk Management Liabilities
Total Risk Management Liabilities	1.1	5.8
SWEPCo
Other Temporary Investments and Restricted Cash
Restricted Cash	11.2	3.4
Risk Management Assets
Risk Management Assets	17.9	18.1
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	29.1	21.5
Risk Management Liabilities
Total Risk Management Liabilities	0.4	2.3
Risk Management Commodity Contracts
Risk Management Assets
Risk Management Assets	392.6	374.6
Risk Management Liabilities
Total Risk Management Liabilities	255.9	252.6
Risk Management Commodity Contracts | AEP Texas
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Risk Management Commodity Contracts | APCo
Risk Management Assets
Risk Management Assets	31.5	37.1
Risk Management Liabilities
Total Risk Management Liabilities	2.9	2.2
Risk Management Commodity Contracts | I&M
Risk Management Assets
Risk Management Assets	3.9	18.4
Risk Management Liabilities
Total Risk Management Liabilities	3.2	0.7
Risk Management Commodity Contracts | OPCo
Risk Management Liabilities
Total Risk Management Liabilities	51.2	47.5
Risk Management Commodity Contracts | PSO
Risk Management Assets
Risk Management Assets	34.2	22.0
Risk Management Liabilities
Total Risk Management Liabilities	1.1	5.8
Risk Management Commodity Contracts | SWEPCo
Risk Management Assets
Risk Management Assets	17.9	18.1
Risk Management Liabilities
Total Risk Management Liabilities	0.4	2.3
Commodity Hedges
Risk Management Assets
Risk Management Assets	163.3	124.9
Risk Management Liabilities
Total Risk Management Liabilities	6.6	0.2
Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	68.4	71.6
Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Risk Management Assets
Total Risk Management Assets	(706.1)	(529.8)
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	10.7	13.7
Total Assets	(681.5)	(502.2)
Risk Management Liabilities
Total Risk Management Liabilities	(607.4)	(446.2)
Other | AEP Texas
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Other | APCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(3.1)	(4.6)
Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	10.7	13.7
Total Assets	5.3	5.3
Other | SWEPCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	(0.9)	(1.0)
Other | Risk Management Commodity Contracts
Risk Management Assets
Total Risk Management Assets	(695.2)	(517.2)
Risk Management Liabilities
Total Risk Management Liabilities	(596.5)	(433.6)
Other | Risk Management Commodity Contracts | AEP Texas
Risk Management Liabilities
Total Risk Management Liabilities	(0.2)	(0.3)
Other | Risk Management Commodity Contracts | APCo
Risk Management Assets
Total Risk Management Assets	(3.1)	(4.6)
Risk Management Liabilities
Total Risk Management Liabilities	(3.2)	(4.7)
Other | Risk Management Commodity Contracts | I&M
Risk Management Assets
Total Risk Management Assets	(5.4)	(8.4)
Risk Management Liabilities
Total Risk Management Liabilities	(23.4)	(9.0)
Other | Risk Management Commodity Contracts | OPCo
Risk Management Liabilities
Total Risk Management Liabilities	0.0	(0.2)
Other | Risk Management Commodity Contracts | PSO
Risk Management Assets
Total Risk Management Assets	(2.1)	(1.9)
Risk Management Liabilities
Total Risk Management Liabilities	(2.1)	(2.0)
Other | Risk Management Commodity Contracts | SWEPCo
Risk Management Assets
Total Risk Management Assets	(0.9)	(1.0)
Risk Management Liabilities
Total Risk Management Liabilities	(1.0)	(1.1)
Other | Commodity Hedges
Risk Management Assets
Total Risk Management Assets	(10.9)	(12.6)
Risk Management Liabilities
Total Risk Management Liabilities	(10.9)	(12.6)
Other | Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	35.2	43.1
Restricted Cash | Other
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Other Cash Deposits | Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	13.9	13.9
Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	160.3	161.9
Fixed Income Securities – Mutual Funds | Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Equity Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	32.6	39.6
Equity Securities – Mutual Funds | Other
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	24.6	23.3
Cash and Cash Equivalents | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	24.6	23.3
Cash and Cash Equivalents | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	10.7	13.7
Cash and Cash Equivalents | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	10.7	13.7
United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,327.6	1,322.8
United States Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,327.6	1,322.8
United States Government | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
United States Government | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	240.5	211.3
Corporate Debt | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	240.5	211.3
Corporate Debt | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Corporate Debt | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
State and Local Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
State and Local Government | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
State and Local Government | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Subtotal Fixed Income Securities | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Subtotal Fixed Income Securities | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Subtotal Fixed Income Securities | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,716.6
Equity Securities - Domestic | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		2,837.7
Domestic | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,716.6	2,837.7
Domestic | Other
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0.0
Domestic | Other | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	228.1	244.6
Risk Management Assets
Risk Management Assets	11.9	2.9
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,730.5	2,847.3
Total Assets	2,970.5	3,094.8
Risk Management Liabilities
Total Risk Management Liabilities	9.0	4.4
Level 1 | Within Current Year
Risk Management Liabilities
Maturities of net fair value of risk management contracts	6.0	(1.0)
Level 1 | Maturity Period 2
Risk Management Liabilities
Maturities of net fair value of risk management contracts	(3.0)
Level 1 | AEP Texas
Other Temporary Investments and Restricted Cash
Restricted Cash	13.4	23.5
Level 1 | APCo
Other Temporary Investments and Restricted Cash
Restricted Cash	10.6	16.2
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	10.6	16.2
Level 1 | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,730.5	2,847.3
Total Assets	2,730.5	2,847.3
Level 1 | SWEPCo
Other Temporary Investments and Restricted Cash
Restricted Cash	11.2	3.4
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	11.2	3.4
Level 1 | Risk Management Commodity Contracts
Risk Management Assets
Risk Management Assets	11.9	2.9
Risk Management Liabilities
Total Risk Management Liabilities	9.0	4.4
Level 1 | Risk Management Commodity Contracts | AEP Texas
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Risk Management Commodity Contracts | APCo
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Risk Management Commodity Contracts | I&M
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Risk Management Commodity Contracts | OPCo
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Risk Management Commodity Contracts | PSO
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Risk Management Commodity Contracts | SWEPCo
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Commodity Hedges
Risk Management Assets
Risk Management Assets	0.0	0.0
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 1 | Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	35.2	43.1
Level 1 | Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 1 | Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	160.3	161.9
Level 1 | Equity Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	32.6	39.6
Level 1 | Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.9	9.6
Level 1 | Cash and Cash Equivalents | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	13.9	9.6
Level 1 | United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | United States Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | Corporate Debt | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | State and Local Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Level 1 | Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | Subtotal Fixed Income Securities | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 1 | Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,716.6
Level 1 | Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		2,837.7
Level 1 | Domestic | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	2,716.6	2,837.7
Level 2
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Risk Management Assets
Risk Management Assets	997.0	712.9
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Total Assets	2,565.1	2,247.0
Risk Management Liabilities
Total Risk Management Liabilities	799.0	618.3
Level 2 | Within Current Year
Risk Management Liabilities
Maturities of net fair value of risk management contracts	59.0	16.0
Level 2 | Maturity Period 2
Risk Management Liabilities
Maturities of net fair value of risk management contracts	63.0	43.0
Level 2 | Maturity Period 3
Risk Management Liabilities
Maturities of net fair value of risk management contracts	3.0	4.0
Level 2 | AEP Texas
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Level 2 | APCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	23.1	6.5
Level 2 | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Total Assets	1,573.3	1,554.0
Level 2 | SWEPCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	5.4	1.0
Level 2 | Risk Management Commodity Contracts
Risk Management Assets
Risk Management Assets	839.7	597.3
Risk Management Liabilities
Total Risk Management Liabilities	714.7	534.1
Level 2 | Risk Management Commodity Contracts | AEP Texas
Risk Management Liabilities
Total Risk Management Liabilities	0.2	0.3
Level 2 | Risk Management Commodity Contracts | APCo
Risk Management Assets
Risk Management Assets	23.1	6.5
Risk Management Liabilities
Total Risk Management Liabilities	2.6	6.9
Level 2 | Risk Management Commodity Contracts | I&M
Risk Management Assets
Risk Management Assets	5.2	19.9
Risk Management Liabilities
Total Risk Management Liabilities	26.4	9.2
Level 2 | Risk Management Commodity Contracts | OPCo
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.2
Level 2 | Risk Management Commodity Contracts | PSO
Risk Management Assets
Risk Management Assets	20.7	3.1
Risk Management Liabilities
Total Risk Management Liabilities	3.0	7.0
Level 2 | Risk Management Commodity Contracts | SWEPCo
Risk Management Assets
Risk Management Assets	5.4	1.0
Risk Management Liabilities
Total Risk Management Liabilities	1.1	2.8
Level 2 | Commodity Hedges
Risk Management Assets
Risk Management Assets	157.3	115.6
Risk Management Liabilities
Total Risk Management Liabilities	15.9	12.6
Level 2 | Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	68.4	71.6
Level 2 | Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Level 2 | Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 2 | Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 2 | Equity Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 2 | Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 2 | Cash and Cash Equivalents | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 2 | United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,327.6	1,322.8
Level 2 | United States Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,327.6	1,322.8
Level 2 | Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	240.5	211.3
Level 2 | Corporate Debt | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	240.5	211.3
Level 2 | State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 2 | State and Local Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Level 2 | Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Level 2 | Subtotal Fixed Income Securities | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	1,568.1	1,534.1
Level 2 | Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Level 2 | Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0.0
Level 2 | Domestic | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Risk Management Assets
Risk Management Assets	253.1	313.5
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Total Assets	253.1	313.5
Risk Management Liabilities
Total Risk Management Liabilities	130.3	147.9
Level 3 | Within Current Year
Risk Management Liabilities
Maturities of net fair value of risk management contracts	66.0	106.0
Level 3 | Maturity Period 2
Risk Management Liabilities
Maturities of net fair value of risk management contracts	56.0	45.0
Level 3 | Maturity Period 3
Risk Management Liabilities
Maturities of net fair value of risk management contracts	10.0	9.0
Level 3 | Maturity Period Four
Risk Management Liabilities
Maturities of net fair value of risk management contracts	(25.0)	(16.0)
Level 3 | AEP Texas
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Level 3 | APCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	11.5	35.2
Level 3 | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Total Assets	4.1	6.9
Level 3 | SWEPCo
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets	13.4	18.1
Level 3 | Risk Management Commodity Contracts
Risk Management Assets
Risk Management Assets	236.2	291.6
Risk Management Liabilities
Total Risk Management Liabilities	128.7	147.7
Level 3 | Risk Management Commodity Contracts | AEP Texas
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 3 | Risk Management Commodity Contracts | APCo
Risk Management Assets
Risk Management Assets	11.5	35.2
Risk Management Liabilities
Total Risk Management Liabilities	3.5	0.0
Level 3 | Risk Management Commodity Contracts | I&M
Risk Management Assets
Risk Management Assets	4.1	6.9
Risk Management Liabilities
Total Risk Management Liabilities	0.2	0.5
Level 3 | Risk Management Commodity Contracts | OPCo
Risk Management Liabilities
Total Risk Management Liabilities	51.2	47.5
Level 3 | Risk Management Commodity Contracts | PSO
Risk Management Assets
Risk Management Assets	15.6	20.8
Risk Management Liabilities
Total Risk Management Liabilities	0.2	0.8
Level 3 | Risk Management Commodity Contracts | SWEPCo
Risk Management Assets
Risk Management Assets	13.4	18.1
Risk Management Liabilities
Total Risk Management Liabilities	0.3	0.6
Level 3 | Commodity Hedges
Risk Management Assets
Risk Management Assets	16.9	21.9
Risk Management Liabilities
Total Risk Management Liabilities	1.6	0.2
Level 3 | Fair Value Hedges
Risk Management Liabilities
Total Risk Management Liabilities	0.0	0.0
Level 3 | Restricted Cash
Other Temporary Investments and Restricted Cash
Restricted Cash	0.0	0.0
Level 3 | Other Cash Deposits
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 3 | Fixed Income Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 3 | Equity Securities – Mutual Funds
Other Temporary Investments and Restricted Cash
Total Other Temporary Investments and Restricted Cash	0.0	0.0
Level 3 | Cash and Cash Equivalents
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | Cash and Cash Equivalents | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | United States Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | United States Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | Corporate Debt
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | Corporate Debt | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | State and Local Government
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | State and Local Government | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Level 3 | Subtotal Fixed Income Securities
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | Subtotal Fixed Income Securities | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0	0.0
Level 3 | Equity Securities - Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	0.0
Level 3 | Domestic
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts		0.0
Level 3 | Domestic | I&M
Spent Nuclear Fuel and Decommissioning Trusts
Spent Nuclear Fuel and Decommissioning Trusts	$ 0.0	$ 0.0