INCOME TAXES (Details)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	1.20%	2.10%
Tax Reform Excess ADIT Reversal	(2.60%)	(2.30%)
Remeasurement of Excess ADIT		(29.70%)
PTCs and ITCs	(6.50%)	(6.80%)
Reversal of Origination Flow-Through	0.40%	0.00%
AFUDC Equity	(1.20%)	(1.20%)
Flow-Through of CAMT	0.40%
Discrete Tax Adjustments		0.20%
Other	0.90%	0.20%
Effective Income Tax Rate	13.60%	(16.50%)
AEP Texas
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	0.20%	0.20%
Tax Reform Excess ADIT Reversal	(3.70%)	(1.30%)
Remeasurement of Excess ADIT		0.00%
PTCs and ITCs	(0.10%)	(0.20%)
Reversal of Origination Flow-Through	0.10%	0.10%
AFUDC Equity	(1.00%)	(1.50%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		0.00%
Other	(0.10%)	0.50%
Effective Income Tax Rate	16.40%	18.80%
AEPTCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	2.60%	2.60%
Tax Reform Excess ADIT Reversal	0.20%	0.20%
Remeasurement of Excess ADIT		0.00%
PTCs and ITCs	0.00%	0.00%
Reversal of Origination Flow-Through	0.20%	0.30%
AFUDC Equity	(1.70%)	(1.80%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		0.00%
Other	0.00%	0.00%
Effective Income Tax Rate	22.30%	22.30%
APCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	1.10%	2.40%
Tax Reform Excess ADIT Reversal	(2.50%)	(13.40%)
Remeasurement of Excess ADIT		0.00%
PTCs and ITCs	0.00%	(0.10%)
Reversal of Origination Flow-Through	(0.70%)	(0.30%)
AFUDC Equity	(0.60%)	(0.40%)
Flow-Through of CAMT	1.60%
Discrete Tax Adjustments		0.00%
Other	(0.10%)	0.10%
Effective Income Tax Rate	19.80%	9.30%
I&M
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	3.40%	3.90%
Tax Reform Excess ADIT Reversal	(3.60%)	(0.50%)
Remeasurement of Excess ADIT		(58.20%)
PTCs and ITCs	(11.70%)	(1.10%)
Reversal of Origination Flow-Through	1.90%	(2.80%)
AFUDC Equity	(0.50%)	(0.70%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		0.00%
Other	(0.10%)	0.00%
Effective Income Tax Rate	10.40%	(38.40%)
OPCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	1.90%	1.00%
Tax Reform Excess ADIT Reversal	(4.10%)	(6.00%)
Remeasurement of Excess ADIT		0.00%
PTCs and ITCs	0.00%	0.00%
Reversal of Origination Flow-Through	0.90%	0.60%
AFUDC Equity	(1.90%)	(1.00%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		0.00%
Other	0.30%	0.20%
Effective Income Tax Rate	18.10%	15.80%
PSO
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	2.90%	3.70%
Tax Reform Excess ADIT Reversal	(3.60%)	(2.00%)
Remeasurement of Excess ADIT		(263.30%)
PTCs and ITCs	(27.60%)	(49.60%)
Reversal of Origination Flow-Through	0.10%	0.20%
AFUDC Equity	(0.50%)	(1.30%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		0.90%
Other	(0.10%)	1.20%
Effective Income Tax Rate	(7.80%)	(289.20%)
SWEPCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%
State and Local Income Taxes, Net	(1.40%)	1.70%
Tax Reform Excess ADIT Reversal	(3.10%)	4.60%
Remeasurement of Excess ADIT		(224.70%)
PTCs and ITCs	(31.20%)	(23.80%)
Reversal of Origination Flow-Through	0.70%	0.60%
AFUDC Equity	(1.40%)	(1.30%)
Flow-Through of CAMT	0.00%
Discrete Tax Adjustments		1.30%
Other	0.70%	(0.80%)
Effective Income Tax Rate	(14.70%)	(221.40%)