Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	2.10%	1.30%	2.00%	1.40%
Tax Reform Excess ADIT Reversal	(6.20%)	(7.10%)	(6.20%)	(6.80%)
Production and Investment Tax Credits	(9.90%)	(6.10%)	(9.80%)	(7.10%)
Flow Through	(1.00%)	(0.10%)	(0.50%)	0.10%
AFUDC Equity	(1.20%)	(1.10%)	(1.30%)	(1.00%)
Discrete Tax Adjustments		0.30%	(1.40%)	(0.20%)
Other	0.40%	1.10%	0.30%	0.50%
Effective Income Tax Rate	5.20%	9.30%	4.10%	7.90%
Income Taxes (Textuals) [Abstract]
corporate alternative minimum tax			15.00%
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	0.60%	0.70%	0.50%	0.50%
Tax Reform Excess ADIT Reversal	(1.30%)	(2.10%)	(1.40%)	(2.00%)
Production and Investment Tax Credits	(0.20%)	(0.60%)	(0.20%)	(0.40%)
Flow Through	0.10%	0.20%	0.20%	0.20%
AFUDC Equity	(0.90%)	(1.40%)	(1.10%)	(1.10%)
Discrete Tax Adjustments		0.00%	0.00%	0.00%
Other	0.30%	0.10%	0.20%	(0.10%)
Effective Income Tax Rate	19.60%	17.90%	19.20%	18.10%
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	2.60%	2.90%	2.60%	2.70%
Tax Reform Excess ADIT Reversal	0.10%	0.30%	0.20%	0.30%
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	0.20%	0.40%	0.20%	0.30%
AFUDC Equity	(2.10%)	(2.30%)	(1.80%)	(1.90%)
Discrete Tax Adjustments		0.00%	0.00%	0.00%
Other	0.00%	0.10%	0.00%	0.20%
Effective Income Tax Rate	21.80%	22.40%	22.20%	22.60%
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	3.20%	(1.00%)	2.60%	1.50%
Tax Reform Excess ADIT Reversal	(4.50%)	(20.40%)	(4.50%)	(11.00%)
Production and Investment Tax Credits	(0.10%)	0.00%	(0.10%)	0.00%
Flow Through	(5.10%)	(1.40%)	(0.80%)	0.60%
AFUDC Equity	(1.50%)	(1.50%)	(0.90%)	(1.00%)
Discrete Tax Adjustments		(6.00%)	2.40%	(2.60%)
Other	(0.40%)	(0.20%)	(0.10%)	0.00%
Effective Income Tax Rate	12.60%	(9.50%)	19.60%	8.50%
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	0.70%	(1.30%)	2.40%	0.40%
Tax Reform Excess ADIT Reversal	(6.10%)	(17.20%)	(7.20%)	(17.20%)
Production and Investment Tax Credits	0.10%	(3.40%)	(0.60%)	(2.30%)
Flow Through	(4.40%)	(1.20%)	(2.90%)	(1.60%)
AFUDC Equity	(0.10%)	(1.30%)	(0.30%)	(0.90%)
Discrete Tax Adjustments		0.00%	1.00%	0.00%
Other	0.10%	1.30%	0.10%	0.40%
Effective Income Tax Rate	11.30%	(2.10%)	13.50%	(0.20%)
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%	1.00%	0.90%	0.90%
Tax Reform Excess ADIT Reversal	(8.50%)	(7.80%)	(7.60%)	(7.80%)
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	1.20%	0.20%	0.80%	0.60%
AFUDC Equity	(0.70%)	(0.70%)	(0.80%)	(0.60%)
Discrete Tax Adjustments		0.00%	0.00%	0.00%
Other	0.10%	0.10%	0.10%	(0.10%)
Effective Income Tax Rate	13.90%	13.80%	14.40%	14.00%
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	2.00%	3.90%	2.00%	3.50%
Tax Reform Excess ADIT Reversal	(17.20%)	(19.20%)	(17.10%)	(18.60%)
Production and Investment Tax Credits	(55.10%)	(32.20%)	(55.20%)	(31.40%)
Flow Through	0.30%	0.30%	0.30%	0.30%
AFUDC Equity	(1.40%)	(0.40%)	(1.40%)	(0.50%)
Discrete Tax Adjustments		0.00%	0.00%	0.00%
Other	0.00%	0.50%	0.10%	0.30%
Effective Income Tax Rate	(50.40%)	(26.10%)	(50.30%)	(25.40%)
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	(1.60%)	2.50%	(1.20%)	2.40%
Tax Reform Excess ADIT Reversal	(4.20%)	(5.20%)	(4.00%)	(5.10%)
Production and Investment Tax Credits	(29.20%)	(19.80%)	(28.20%)	(20.80%)
Flow Through	(0.80%)	0.00%	(0.30%)	(0.20%)
AFUDC Equity	0.00%	(0.50%)	(0.30%)	(0.50%)
Discrete Tax Adjustments		0.80%	0.00%	0.50%
Other	0.70%	(0.10%)	0.10%	0.00%
Effective Income Tax Rate	(14.10%)	(1.30%)	(12.90%)	(2.70%)