Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Dec. 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate	21.00%		21.00%		21.00%	21.00%
State and Local Income Taxes, Net	0.90%		2.10%		1.80%	2.00%
Tax Reform Excess ADIT Reversal	(6.00%)		(6.20%)		(6.00%)	(6.20%)
Remeasurement of Excess ADIT	(1.70%)				(19.00%)
Production and Investment Tax Credits	(11.00%)		(9.90%)		(7.00%)	(9.80%)
Reversal of Origination Flow-Through	1.10%		(1.00%)
Other	(2.40%)		(0.80%)		(2.00%)	(2.90%)
Effective Income Tax Rate	1.90%		5.20%		(11.20%)	4.10%
Income Taxes (Textuals) [Abstract]
corporate alternative minimum tax					15.00%
Production Tax Credit Proceeds	$ 10.0	$ 62.0					$ 102.0
Subsequent Event [Member]
Income Taxes (Textuals) [Abstract]
Production Tax Credit Proceeds				$ 90.0
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 and Local Income Taxes, Net	0.50%		0.60%		0.40%	0.50%
Tax Reform Excess ADIT Reversal	(1.20%)		(1.30%)		(1.20%)	(1.40%)
Remeasurement of Excess ADIT	3.90%				2.40%
Production and Investment Tax Credits	(0.20%)		(0.20%)		(0.20%)	(0.20%)
Reversal of Origination Flow-Through	0.10%		0.10%
Other	(1.30%)		(0.60%)		(1.10%)	(0.70%)
Effective Income Tax Rate	22.80%		19.60%		21.30%	19.20%
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 and Local Income Taxes, Net	2.30%		2.60%		2.50%	2.60%
Tax Reform Excess ADIT Reversal	0.20%		0.10%		0.20%	0.20%
Remeasurement of Excess ADIT	0.00%				0.00%
Production and Investment Tax Credits	0.00%		0.00%		0.00%	0.00%
Reversal of Origination Flow-Through	0.30%		0.20%
Other	(2.40%)		(2.10%)		(1.80%)	(1.60%)
Effective Income Tax Rate	21.40%		21.80%		21.90%	22.20%
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 and Local Income Taxes, Net	3.00%		3.20%		2.60%	2.60%
Tax Reform Excess ADIT Reversal	(2.90%)		(4.50%)		(10.00%)	(4.50%)
Remeasurement of Excess ADIT	0.00%				0.00%
Production and Investment Tax Credits	(0.10%)		(0.10%)		(0.10%)	(0.10%)
Reversal of Origination Flow-Through	(1.00%)		(5.10%)
Other	(2.10%)		(1.90%)		(1.40%)	0.60%
Effective Income Tax Rate	17.90%		12.60%		12.10%	19.60%
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 and Local Income Taxes, Net	(3.70%)		0.70%		2.30%	2.40%
Tax Reform Excess ADIT Reversal	(15.20%)		(6.10%)		(3.40%)	(7.20%)
Remeasurement of Excess ADIT	(46.20%)				(55.80%)
Production and Investment Tax Credits	1.80%		0.10%		(0.50%)	(0.60%)
Reversal of Origination Flow-Through	12.00%		(4.40%)
Other	(2.00%)		0.00%		(0.70%)	(2.10%)
Effective Income Tax Rate	(32.30%)		11.30%		(37.10%)	13.50%
Income Taxes (Textuals) [Abstract]
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received					$ 61.0
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 and Local Income Taxes, Net	(1.20%)		0.80%		0.60%	0.90%
Tax Reform Excess ADIT Reversal	(34.90%)		(8.50%)		(10.60%)	(7.60%)
Remeasurement of Excess ADIT	0.00%				0.00%
Production and Investment Tax Credits	0.00%		0.00%		0.00%	0.00%
Reversal of Origination Flow-Through	2.70%		1.20%
Other	(4.10%)		(0.60%)		(0.40%)	0.10%
Effective Income Tax Rate	(16.50%)		13.90%		10.60%	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 and Local Income Taxes, Net	(2.90%)		2.00%		0.00%	2.00%
Tax Reform Excess ADIT Reversal	(3.40%)		(17.20%)		(2.80%)	(17.10%)
Remeasurement of Excess ADIT	0.00%				(116.80%)
Production and Investment Tax Credits	(70.60%)		(55.10%)		(61.30%)	(55.20%)
Reversal of Origination Flow-Through	0.30%		0.30%
Other	(1.50%)		(1.40%)		(0.40%)	(1.00%)
Effective Income Tax Rate	(57.10%)		(50.40%)		(160.30%)	(50.30%)
Income Taxes (Textuals) [Abstract]
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received					$ 49.0
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 and Local Income Taxes, Net	(0.10%)		(1.60%)		(2.40%)	(1.20%)
Tax Reform Excess ADIT Reversal	2.00%		(4.20%)		(1.50%)	(4.00%)
Remeasurement of Excess ADIT	0.00%				303.00%
Production and Investment Tax Credits	15.90%		(29.20%)		69.30%	(28.20%)
Reversal of Origination Flow-Through	(0.40%)		(0.80%)
Other	0.50%		0.70%		(1.20%)	(0.50%)
Effective Income Tax Rate	38.90%		(14.10%)		388.20%	(12.90%)
Income Taxes (Textuals) [Abstract]
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received					$ 114.0