Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	1.40%	(0.80%)	1.70%	0.70%
Tax Reform Excess ADIT Reversal	(5.70%)	(9.70%)	(6.00%)	(7.80%)
Production and Investment Tax Credits	(5.10%)	(12.00%)	(7.40%)	(8.70%)
Flow Through	0.10%	(0.30%)	(0.20%)	0.00%
AFUDC Equity	(1.40%)	(1.40%)	(1.40%)	(1.10%)
Discrete Tax Adjustments	(4.10%)	(0.20%)	(2.80%)	(0.20%)
Other	0.10%	1.00%	0.30%	0.60%
Effective Income Tax Rate	6.30%	(2.40%)	5.20%	4.50%
Income Taxes (Textuals) [Abstract]
corporate alternative minimum tax			15.00%
Production Tax Credit Proceeds			$ 80.0
AEP Texas Inc. [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	0.50%	0.50%	0.50%	0.50%
Tax Reform Excess ADIT Reversal	(1.30%)	(2.00%)	(1.30%)	(2.00%)
Production and Investment Tax Credits	0.10%	(0.40%)	0.00%	(0.40%)
Flow Through	0.20%	0.20%	0.20%	0.20%
AFUDC Equity	(1.40%)	(1.20%)	(1.20%)	(1.20%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	(0.50%)	0.20%	(0.20%)	0.10%
Effective Income Tax Rate	18.60%	18.30%	19.00%	18.20%
AEP Transmission Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	2.80%	2.60%	2.70%	2.70%
Tax Reform Excess ADIT Reversal	(0.20%)	0.30%	0.10%	0.30%
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	0.30%	0.30%	0.30%	0.30%
AFUDC Equity	(2.40%)	(1.90%)	(2.00%)	(1.90%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	(1.00%)	0.20%	(0.50%)	0.10%
Effective Income Tax Rate	20.50%	22.50%	21.60%	22.50%
Appalachian Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	2.20%	(6.20%)	2.40%	(0.80%)
Tax Reform Excess ADIT Reversal	(5.30%)	(8.60%)	(4.80%)	(10.30%)
Production and Investment Tax Credits	(0.10%)	0.00%	(0.10%)	0.00%
Flow Through	1.80%	(0.70%)	0.10%	0.20%
AFUDC Equity	(1.50%)	(0.40%)	(1.20%)	(0.80%)
Discrete Tax Adjustments	0.00%	0.00%	1.50%	(1.80%)
Other	0.70%	0.00%	0.40%	0.00%
Effective Income Tax Rate	18.80%	5.10%	19.30%	7.50%
Indiana Michigan Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	2.10%	2.70%	2.30%	1.30%
Tax Reform Excess ADIT Reversal	(8.50%)	(13.30%)	(7.60%)	(15.70%)
Production and Investment Tax Credits	(0.70%)	0.00%	(0.60%)	(1.40%)
Flow Through	0.70%	(1.50%)	(1.70%)	(1.60%)
AFUDC Equity	(0.50%)	(0.60%)	(0.40%)	(0.80%)
Discrete Tax Adjustments	0.00%	0.00%	0.70%	0.00%
Other	(3.50%)	(0.50%)	(1.20%)	0.20%
Effective Income Tax Rate	10.60%	7.80%	12.50%	3.00%
Ohio Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	0.80%	0.70%	0.90%	0.80%
Tax Reform Excess ADIT Reversal	(6.80%)	(6.20%)	(7.30%)	(7.30%)
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	0.80%	0.40%	0.80%	0.50%
AFUDC Equity	(0.80%)	(0.80%)	(0.80%)	(0.70%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	1.30%	0.20%	0.50%	0.10%
Effective Income Tax Rate	16.30%	15.30%	15.10%	14.40%
Public Service Co Of Oklahoma [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	3.00%	3.00%	2.80%	3.20%
Tax Reform Excess ADIT Reversal	(17.00%)	(21.90%)	(17.10%)	(20.80%)
Production and Investment Tax Credits	(46.90%)	(43.70%)	(48.90%)	(39.50%)
Flow Through	0.30%	0.40%	0.30%	0.30%
AFUDC Equity	(1.60%)	(0.40%)	(1.50%)	(0.40%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	(0.20%)	0.20%	(0.20%)	0.20%
Effective Income Tax Rate	(41.40%)	(41.40%)	(43.60%)	(36.00%)
Southwestern Electric Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%	21.00%	21.00%
State Income Tax, net of Federal Benefit	(4.30%)	(5.30%)	(2.90%)	(1.50%)
Tax Reform Excess ADIT Reversal	(6.20%)	(4.60%)	(5.30%)	(4.80%)
Production and Investment Tax Credits	(25.50%)	(24.10%)	(26.70%)	(22.50%)
Flow Through	(0.20%)	(1.30%)	(0.30%)	(0.80%)
AFUDC Equity	(0.80%)	(0.20%)	(0.50%)	(0.40%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.30%
Other	0.20%	(0.20%)	0.20%	0.00%
Effective Income Tax Rate	(15.80%)	(14.70%)	(14.50%)	(8.70%)