Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
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%)	0.60%	0.70%	1.20%
Tax Reform Excess ADIT Reversal	(9.70%)	(8.50%)	(7.80%)	(8.90%)
Production and Investment Tax Credits	(12.00%)	(4.70%)	(8.70%)	(4.90%)
Flow Through	(0.30%)	0.00%	0.00%	0.20%
AFUDC Equity	(1.40%)	(1.20%)	(1.10%)	(1.10%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	(0.20%)	0.20%	(0.20%)	1.10%
Other	1.00%	0.70%	0.60%	0.10%
Effective Income Tax Rate	(2.40%)	8.10%	4.50%	8.70%
Corporate Alternative Minimum Tax
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate			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	0.50%	0.30%	0.50%	0.30%
Tax Reform Excess ADIT Reversal	(2.00%)	(6.30%)	(2.00%)	(7.20%)
Production and Investment Tax Credits	(0.40%)	(0.30%)	(0.40%)	(0.30%)
Flow Through	0.20%	0.30%	0.20%	0.30%
AFUDC Equity	(1.20%)	(1.00%)	(1.20%)	(1.10%)
Parent Company Loss Benefit		(1.10%)		(0.70%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	0.20%	(0.10%)	0.10%	0.00%
Effective Income Tax Rate	18.30%	12.80%	18.20%	12.30%
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%	3.00%	2.70%	2.80%
Tax Reform Excess ADIT Reversal	0.30%	0.30%	0.30%	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	(1.90%)	(2.20%)	(1.90%)	(1.90%)
Parent Company Loss Benefit		(2.30%)		(1.90%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	0.20%	0.10%	0.10%	0.00%
Effective Income Tax Rate	22.50%	20.20%	22.50%	20.60%
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	(6.20%)	(0.30%)	(0.80%)	1.50%
Tax Reform Excess ADIT Reversal	(8.60%)	(14.20%)	(10.30%)	(15.20%)
Production and Investment Tax Credits	0.00%	(0.20%)	0.00%	0.00%
Flow Through	(0.70%)	0.40%	0.20%	1.70%
AFUDC Equity	(0.40%)	(1.80%)	(0.80%)	(1.20%)
Parent Company Loss Benefit		(1.20%)		(1.30%)
Discrete Tax Adjustments	0.00%	0.00%	(1.80%)	0.00%
Other	0.00%	0.30%	0.00%	0.10%
Effective Income Tax Rate	5.10%	4.00%	7.50%	6.60%
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	2.70%	1.90%	1.30%	1.60%
Tax Reform Excess ADIT Reversal	(13.30%)	(16.10%)	(15.70%)	(17.70%)
Production and Investment Tax Credits	0.00%	(2.00%)	(1.40%)	(2.20%)
Flow Through	(1.50%)	(2.80%)	(1.60%)	(3.00%)
AFUDC Equity	(0.60%)	(1.00%)	(0.80%)	(1.00%)
Parent Company Loss Benefit		(3.60%)		(2.80%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	(0.50%)	0.80%	0.20%	0.40%
Effective Income Tax Rate	7.80%	(1.80%)	3.00%	(3.70%)
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	0.70%	1.20%	0.80%	0.80%
Tax Reform Excess ADIT Reversal	(6.20%)	(8.90%)	(7.30%)	(9.10%)
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	0.40%	0.60%	0.50%	0.90%
AFUDC Equity	(0.80%)	(0.30%)	(0.70%)	(0.80%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	0.00%	0.00%	0.00%	(1.30%)
Other	0.20%	0.00%	0.10%	0.20%
Effective Income Tax Rate	15.30%	13.60%	14.40%	11.70%
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%	5.00%	3.20%	4.80%
Tax Reform Excess ADIT Reversal	(21.90%)	(19.80%)	(20.80%)	(19.80%)
Production and Investment Tax Credits	(43.70%)	(8.90%)	(39.50%)	(8.10%)
Flow Through	0.40%	0.70%	0.30%	0.70%
AFUDC Equity	(0.40%)	(0.20%)	(0.40%)	(0.30%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	0.00%	0.00%	0.00%	(0.90%)
Other	0.20%	(0.10%)	0.20%	(0.20%)
Effective Income Tax Rate	(41.40%)	(2.30%)	(36.00%)	(2.80%)
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	(5.30%)	(6.90%)	(1.50%)	(3.40%)
Tax Reform Excess ADIT Reversal	(4.60%)	(4.20%)	(4.80%)	(4.30%)
Production and Investment Tax Credits	(24.10%)	(5.40%)	(22.50%)	(4.60%)
Flow Through	(1.30%)	(0.20%)	(0.80%)	(0.20%)
AFUDC Equity	(0.20%)	(0.50%)	(0.40%)	(0.60%)
Parent Company Loss Benefit		0.70%		0.00%
Discrete Tax Adjustments	0.00%	1.20%	0.30%	0.60%
Other	(0.20%)	(0.20%)	0.00%	(0.10%)
Effective Income Tax Rate	(14.70%)	5.50%	(8.70%)	8.40%