Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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	1.30%	0.80%	1.40%	1.60%
Tax Reform Excess ADIT Reversal	(7.10%)	(9.10%)	(6.80%)	(9.10%)
Production and Investment Tax Credits	(6.10%)	(4.70%)	(7.10%)	(5.10%)
Flow Through	(0.10%)	0.40%	0.10%	0.30%
AFUDC Equity	(1.10%)	(1.20%)	(1.00%)	(1.10%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	0.30%	2.90%	(0.20%)	1.70%
Other	1.10%	(0.50%)	0.50%	(0.20%)
Effective Income Tax Rate	9.30%	9.60%	7.90%	9.10%
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	0.70%	(0.40%)	0.50%	0.30%
Tax Reform Excess ADIT Reversal	(2.10%)	(7.90%)	(2.00%)	(7.90%)
Production and Investment Tax Credits	(0.60%)	(0.30%)	(0.40%)	(0.30%)
Flow Through	0.20%	0.40%	0.20%	0.30%
AFUDC Equity	(1.40%)	(0.90%)	(1.10%)	(1.10%)
Parent Company Loss Benefit		(0.70%)		(0.40%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	0.10%	(0.20%)	(0.10%)	0.00%
Effective Income Tax Rate	17.90%	11.00%	18.10%	11.90%
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	2.90%	2.60%	2.70%	2.70%
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	0.40%	0.40%	0.30%	0.30%
AFUDC Equity	(2.30%)	(1.70%)	(1.90%)	(1.70%)
Parent Company Loss Benefit		(1.70%)		(1.80%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	0.10%	(0.10%)	0.20%	0.00%
Effective Income Tax Rate	22.40%	20.80%	22.60%	20.80%
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	(1.00%)	0.90%	1.50%	2.40%
Tax Reform Excess ADIT Reversal	(20.40%)	(11.80%)	(11.00%)	(15.70%)
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	(1.40%)	3.30%	0.60%	2.20%
AFUDC Equity	(1.50%)	(0.50%)	(1.00%)	(0.90%)
Parent Company Loss Benefit		1.00%		(1.40%)
Discrete Tax Adjustments	(6.00%)	0.00%	(2.60%)	0.00%
Other	(0.20%)	0.00%	0.00%	0.10%
Effective Income Tax Rate	(9.50%)	13.90%	8.50%	7.70%
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	(1.30%)	1.60%	0.40%	1.40%
Tax Reform Excess ADIT Reversal	(17.20%)	(20.40%)	(17.20%)	(19.00%)
Production and Investment Tax Credits	(3.40%)	(3.30%)	(2.30%)	(2.30%)
Flow Through	(1.20%)	(5.80%)	(1.60%)	(3.00%)
AFUDC Equity	(1.30%)	(2.20%)	(0.90%)	(1.00%)
Parent Company Loss Benefit		(1.70%)		(2.10%)
Discrete Tax Adjustments	0.00%	0.00%	0.00%	0.00%
Other	1.30%	(0.50%)	0.40%	(0.30%)
Effective Income Tax Rate	(2.10%)	(11.30%)	(0.20%)	(5.30%)
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	1.00%	0.70%	0.90%	0.70%
Tax Reform Excess ADIT Reversal	(7.80%)	(8.60%)	(7.80%)	(9.10%)
Production and Investment Tax Credits	0.00%	0.00%	0.00%	0.00%
Flow Through	0.20%	1.00%	0.60%	1.10%
AFUDC Equity	(0.70%)	(0.90%)	(0.60%)	(1.00%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	0.00%	0.00%	0.00%	(1.80%)
Other	0.10%	(0.10%)	(0.10%)	(0.10%)
Effective Income Tax Rate	13.80%	13.10%	14.00%	10.80%
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	3.90%	4.40%	3.50%	4.40%
Tax Reform Excess ADIT Reversal	(19.20%)	(20.10%)	(18.60%)	(19.90%)
Production and Investment Tax Credits	(32.20%)	(6.80%)	(31.40%)	(6.60%)
Flow Through	0.30%	0.80%	0.30%	0.80%
AFUDC Equity	(0.40%)	(0.70%)	(0.50%)	(0.70%)
Parent Company Loss Benefit		0.00%		0.00%
Discrete Tax Adjustments	0.00%	(2.60%)	0.00%	(2.80%)
Other	0.50%	(0.10%)	0.30%	0.00%
Effective Income Tax Rate	(26.10%)	(4.10%)	(25.40%)	(3.80%)
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	2.50%	1.90%	2.40%	0.30%
Tax Reform Excess ADIT Reversal	(5.20%)	(1.90%)	(5.10%)	(4.30%)
Production and Investment Tax Credits	(19.80%)	(1.40%)	(20.80%)	(3.70%)
Flow Through	0.00%	0.50%	(0.20%)	(0.20%)
AFUDC Equity	(0.50%)	(0.80%)	(0.50%)	(0.60%)
Parent Company Loss Benefit		(1.90%)		(0.80%)
Discrete Tax Adjustments	0.80%	0.00%	0.50%	0.00%
Other	(0.10%)	(1.20%)	0.00%	(0.40%)
Effective Income Tax Rate	(1.30%)	16.20%	(2.70%)	11.30%