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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	1.20%	0.60%	1.00%	1.20%
Tax Reform Excess ADIT Reversal	(2.50%)	(2.80%)	(1.80%)	(3.10%)
Remeasurement of Excess ADIT			(12.40%)	(11.90%)
Production and Investment Tax Credits	(7.90%)	(9.90%)	(7.10%)	(8.30%)
Reversal of Origination Flow-Through	1.30%	0.10%	0.60%	0.20%
AFUDC Equity	(1.60%)	(1.50%)	(1.20%)	(1.60%)
Discrete Tax Adjustments		(3.70%)		(2.10%)
Flow-Through of CAMT	0.60%		0.20%
Other	0.10%	0.00%	0.10%	0.20%
Effective Income Tax Rate	12.20%	3.80%	0.40%	(4.40%)
AEP Texas
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	0.60%	0.30%	0.60%	0.40%
Tax Reform Excess ADIT Reversal	(2.30%)	(1.00%)	(2.60%)	(1.10%)
Remeasurement of Excess ADIT			0.00%	1.50%
Production and Investment Tax Credits	(0.10%)	0.00%	(0.10%)	(0.10%)
Reversal of Origination Flow-Through	0.10%	0.10%	0.10%	0.10%
AFUDC Equity	(1.80%)	(2.30%)	(1.40%)	(1.70%)
Discrete Tax Adjustments		0.00%		0.00%
Flow-Through of CAMT	0.00%		0.00%
Other	0.10%	0.20%	0.00%	0.00%
Effective Income Tax Rate	17.60%	18.30%	17.60%	20.10%
AEPTCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	2.50%	2.50%	2.50%	2.50%
Tax Reform Excess ADIT Reversal	0.20%	0.20%	0.40%	0.20%
Remeasurement of Excess ADIT			(25.50%)	0.00%
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Reversal of Origination Flow-Through	0.30%	0.30%	0.20%	0.30%
AFUDC Equity	(2.50%)	(1.90%)	(1.50%)	(2.00%)
Discrete Tax Adjustments		0.00%		0.00%
Flow-Through of CAMT	0.00%		0.00%
Other	0.00%	(0.20%)	0.10%	(0.10%)
Effective Income Tax Rate	21.50%	21.90%	(2.80%)	21.90%
APCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	(1.20%)	1.40%	0.40%	2.10%
Tax Reform Excess ADIT Reversal	(3.50%)	(2.30%)	(2.70%)	(7.10%)
Remeasurement of Excess ADIT			(5.90%)	0.00%
Production and Investment Tax Credits	0.10%	(0.10%)	0.00%	(0.10%)
Reversal of Origination Flow-Through	6.70%	(1.10%)	0.50%	(0.80%)
AFUDC Equity	(0.50%)	(1.50%)	(0.70%)	(1.10%)
Discrete Tax Adjustments		0.00%		0.00%
Flow-Through of CAMT	6.20%		1.70%
Other	(0.70%)	(0.40%)	0.00%	(0.10%)
Effective Income Tax Rate	28.10%	17.00%	14.30%	13.90%
I&M
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	2.80%	0.70%	2.40%	1.50%
Tax Reform Excess ADIT Reversal	(5.50%)	(7.90%)	(2.50%)	(5.70%)
Remeasurement of Excess ADIT			(12.80%)	(27.50%)
Production and Investment Tax Credits	(26.60%)	(45.60%)	(20.90%)	(23.40%)
Reversal of Origination Flow-Through	2.20%	0.30%	2.00%	0.30%
AFUDC Equity	(1.10%)	(1.20%)	(0.90%)	(1.10%)
Discrete Tax Adjustments		0.00%		0.00%
Flow-Through of CAMT	0.00%		0.00%
Other	(0.80%)	0.00%	(0.30%)	0.00%
Effective Income Tax Rate	(8.00%)	(32.70%)	(12.00%)	(34.90%)
OPCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	1.00%	1.10%	1.20%	0.90%
Tax Reform Excess ADIT Reversal	(2.70%)	(7.30%)	(3.00%)	(8.70%)
Remeasurement of Excess ADIT			0.00%	0.00%
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Reversal of Origination Flow-Through	0.60%	0.70%	0.60%	0.80%
AFUDC Equity	(1.80%)	(1.20%)	(1.70%)	(1.30%)
Discrete Tax Adjustments		0.00%		0.00%
Flow-Through of CAMT	0.00%		0.00%
Other	(0.30%)	0.60%	0.00%	0.40%
Effective Income Tax Rate	17.80%	14.90%	18.10%	13.10%
PSO
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	3.00%	0.00%	3.00%	0.00%
Tax Reform Excess ADIT Reversal	(4.80%)	(5.00%)	(4.10%)	(4.30%)
Remeasurement of Excess ADIT			(8.80%)	(40.50%)
Production and Investment Tax Credits	(50.60%)	(61.90%)	(50.90%)	(61.70%)
Reversal of Origination Flow-Through	0.20%	0.30%	0.20%	0.30%
AFUDC Equity	(1.20%)	(1.30%)	(1.10%)	(1.30%)
Discrete Tax Adjustments		0.00%		1.20%
Flow-Through of CAMT	0.00%		0.00%
Other	0.10%	1.50%	0.00%	0.00%
Effective Income Tax Rate	(32.30%)	(45.40%)	(40.70%)	(85.30%)
SWEPCo
Effective Income Tax Rate Reconciliation [Line Items]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State and Local Income Taxes, Net	(3.90%)	(2.60%)	(3.30%)	(2.60%)
Tax Reform Excess ADIT Reversal	(3.20%)	(3.20%)	(2.00%)	(4.20%)
Remeasurement of Excess ADIT			(17.20%)	(181.80%)
Production and Investment Tax Credits	(27.50%)	(23.40%)	(31.00%)	(79.10%)
Reversal of Origination Flow-Through	0.70%	0.60%	0.70%	2.10%
AFUDC Equity	(1.10%)	(0.50%)	(1.30%)	(2.30%)
Discrete Tax Adjustments		0.00%		1.10%
Flow-Through of CAMT	0.00%		0.00%
Other	0.00%	0.00%	0.20%	(0.50%)
Effective Income Tax Rate	(14.00%)	(8.10%)	(32.90%)	(246.30%)

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to AFUDC Equity.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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