EFFECTS OF REGULATION - Regulatory Asset - AEP Texas (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 5,129.2	$ 5,092.4
Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	1,310.8	837.3
Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	3,818.4	4,255.1
Earns/earning a return | Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	395.1	349.9
Earns/earning a return | Pending final regulatory approval | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	51.0	0.0
Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	20.7	49.8
Earns/earning a return | Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	1,711.5	1,946.9
Earns/earning a return | Approved for recovery | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 106.7	170.9
Remaining Recovery Period	7 years
Earns/earning a return | Approved for recovery | Texas Mobile Temporary Emergency Electric Energy Facilities Rider
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 32.6	33.4
Remaining Recovery Period	2 years
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 159.9	124.9
Does not earns/earning a return | Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	915.7	487.4
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	300.8	408.9
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	86.3	52.6
Does not earns/earning a return | Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	2,106.9	2,308.2
Does not earns/earning a return | Approved for recovery | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 66.5	38.5
Remaining Recovery Period	7 years
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 240.1	269.1
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 974.2	1,054.1
Remaining Recovery Period	12 years
AEP TEXAS INC.
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 353.6	315.3
AEP TEXAS INC. | Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	77.1	64.3
AEP TEXAS INC. | Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 276.5	251.0
AEP TEXAS INC. | Approved for recovery | Texas Transmission Cost Recovery Factor
Regulatory Asset [Line Items]
Remaining Recovery Period	2 years
AEP TEXAS INC. | Earns/earning a return | Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 41.3	0.0
AEP TEXAS INC. | Earns/earning a return | Pending final regulatory approval | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	41.3	0.0
AEP TEXAS INC. | Earns/earning a return | Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	60.8	43.5
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Texas Mobile Temporary Emergency Electric Energy Facilities Rider
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 32.6	33.4
Remaining Recovery Period	2 years
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Meter Replacement Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 5.8	9.4
Remaining Recovery Period	2 years
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 22.4	0.7
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	35.8	64.3
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	13.1	37.7
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Deferred Pension and OPEB Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	15.6	0.0
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Line Inspection Costs
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	5.8	5.7
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	1.3	20.9
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	215.7	207.5
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	14.8	15.1
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 177.5	183.2
Remaining Recovery Period	12 years
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Texas Transmission Cost Recovery Factor
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 14.2	0.0
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Peak Demand Reduction/Energy Efficiency
Regulatory Asset [Line Items]
Total Noncurrent Regulatory Assets	$ 9.2	$ 9.2
Remaining Recovery Period	2 years