Income Taxes (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	1.90%	1.50%
Tax Reform Excess ADIT Reversal	(6.20%)	(6.60%)
Production and Investment Tax Credits	(9.70%)	(8.00%)
Flow Through	0.10%	0.30%
AFUDC Equity	(1.40%)	(0.90%)
Discrete Tax Adjustments	(3.20%)	(0.60%)
Other	0.10%	0.20%
Effective Income Tax Rate	2.60%	6.90%
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%
State Income Tax, net of Federal Benefit	0.30%	0.30%
Tax Reform Excess ADIT Reversal	(1.50%)	(2.00%)
Production and Investment Tax Credits	(0.20%)	(0.20%)
Flow Through	0.20%	0.30%
AFUDC Equity	(1.50%)	(0.90%)
Discrete Tax Adjustments	0.00%	0.00%
Other	0.10%	(0.10%)
Effective Income Tax Rate	18.40%	18.40%
AEP Transmission Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	2.60%	2.60%
Tax Reform Excess ADIT Reversal	0.30%	0.30%
Production and Investment Tax Credits	0.00%	0.00%
Flow Through	0.30%	0.30%
AFUDC Equity	(1.60%)	(1.60%)
Discrete Tax Adjustments	0.00%	0.00%
Other	0.10%	0.00%
Effective Income Tax Rate	22.70%	22.60%
Appalachian Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	2.40%	2.90%
Tax Reform Excess ADIT Reversal	(4.60%)	(5.80%)
Production and Investment Tax Credits	0.00%	0.00%
Flow Through	0.60%	1.70%
AFUDC Equity	(0.70%)	(0.70%)
Discrete Tax Adjustments	3.20%	(0.60%)
Other	0.00%	0.00%
Effective Income Tax Rate	21.90%	18.50%
Indiana Michigan Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	3.60%	1.60%
Tax Reform Excess ADIT Reversal	(7.90%)	(17.30%)
Production and Investment Tax Credits	(1.10%)	(1.40%)
Flow Through	(1.80%)	(1.90%)
AFUDC Equity	(0.50%)	(0.60%)
Discrete Tax Adjustments	1.80%	0.00%
Other	0.00%	(0.20%)
Effective Income Tax Rate	15.10%	1.20%
Ohio Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	1.00%	0.70%
Tax Reform Excess ADIT Reversal	(6.80%)	(7.80%)
Production and Investment Tax Credits	0.00%	0.00%
Flow Through	0.50%	0.90%
AFUDC Equity	(0.80%)	(0.60%)
Discrete Tax Adjustments	0.00%	0.00%
Other	0.00%	0.00%
Effective Income Tax Rate	14.90%	14.20%
Public Service Co Of Oklahoma [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	3.20%	0.60%
Tax Reform Excess ADIT Reversal	(18.70%)	(15.30%)
Production and Investment Tax Credits	(55.70%)	(26.20%)
Flow Through	0.30%	0.60%
AFUDC Equity	(1.40%)	(0.70%)
Discrete Tax Adjustments	0.00%	0.00%
Other	(2.00%)	(0.80%)
Effective Income Tax Rate	(53.30%)	(20.80%)
Southwestern Electric Power Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%	21.00%
State Income Tax, net of Federal Benefit	(0.40%)	2.30%
Tax Reform Excess ADIT Reversal	(3.80%)	(4.90%)
Production and Investment Tax Credits	(26.40%)	(23.10%)
Flow Through	0.50%	(0.60%)
AFUDC Equity	(0.80%)	(0.50%)
Discrete Tax Adjustments	0.00%	0.00%
Other	(0.80%)	0.60%
Effective Income Tax Rate	(10.70%)	(5.20%)