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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 0.60% | 0.90% | 0.90% | 1.80%
Tax Reform Excess ADIT Reversal | (0.40%) | (6.00%) | (1.40%) | (6.00%)
Remeasurement of Excess ADIT | (37.00%) | (1.70%) | (19.50%) | (19.00%)
Production and Investment Tax Credits | (6.70%) | (11.00%) | (6.60%) | (7.00%)
Reversal of Origination Flow-Through | 0.00% | 1.10% | 0.20% |
AFUDC Equity | (1.00%) |  | (1.10%) |
Flow-Through of CAMT | (0.30%) |  |  |
Other | (0.40%) | (2.40%) | 0.10% | (2.00%)
Effective Income Tax Rate | (24.20%) | 1.90% | (6.40%) | (11.20%)
AEP Texas |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 0.90% | 0.50% | 0.60% | 0.40%
Tax Reform Excess ADIT Reversal | (2.10%) | (1.20%) | (2.80%) | (1.20%)
Remeasurement of Excess ADIT | 0.00% | 3.90% | 0.00% | 2.40%
Production and Investment Tax Credits | (0.10%) | (0.20%) | (0.10%) | (0.20%)
Reversal of Origination Flow-Through | 0.10% | 0.10% | 0.10% |
AFUDC Equity | (1.20%) |  | (1.10%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | 0.10% | (1.30%) | (0.10%) | (1.10%)
Effective Income Tax Rate | 18.70% | 22.80% | 17.60% | 21.30%
AEPTCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 2.50% | 2.30% | 2.50% | 2.50%
Tax Reform Excess ADIT Reversal | 0.60% | 0.20% | 0.40% | 0.20%
Remeasurement of Excess ADIT | (54.30%) | 0.00% | (34.40%) | 0.00%
Production and Investment Tax Credits | 0.00% | 0.00% | 0.00% | 0.00%
Reversal of Origination Flow-Through | 0.20% | 0.30% | 0.20% |
AFUDC Equity | (0.80%) |  | (1.10%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | 0.00% | (2.40%) | 0.00% | (1.80%)
Effective Income Tax Rate | (30.80%) | 21.40% | (11.40%) | 21.90%
APCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 0.80% | 3.00% | 1.00% | 2.60%
Tax Reform Excess ADIT Reversal | (2.00%) | (2.90%) | (2.40%) | (10.00%)
Remeasurement of Excess ADIT | (26.00%) | 0.00% | (8.10%) | 0.00%
Production and Investment Tax Credits | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Reversal of Origination Flow-Through | (4.10%) | (1.00%) | (1.80%) |
AFUDC Equity | (0.90%) |  | (0.70%) |
Flow-Through of CAMT | (3.40%) |  |  |
Other | 0.00% | (2.10%) | 0.10% | (1.40%)
Effective Income Tax Rate | (14.70%) | 17.90% | 9.00% | 12.10%
I&M |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 1.10% | (3.70%) | 2.00% | 2.30%
Tax Reform Excess ADIT Reversal | 2.80% | (15.20%) | 0.20% | (3.40%)
Remeasurement of Excess ADIT | (40.80%) | (46.20%) | (24.10%) | (55.80%)
Production and Investment Tax Credits | (18.70%) | 1.80% | (15.80%) | (0.50%)
Reversal of Origination Flow-Through | 1.80% | 12.00% | 1.80% |
AFUDC Equity | (0.80%) |  | (0.70%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | 0.00% | (2.00%) | 0.00% | (0.70%)
Effective Income Tax Rate | (33.60%) | (32.30%) | (15.60%) | (37.10%)
OPCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 1.00% | (1.20%) | 1.30% | 0.60%
Tax Reform Excess ADIT Reversal | (2.70%) | (34.90%) | (3.20%) | (10.60%)
Remeasurement of Excess ADIT | 0.00% | 0.00% | 0.00% | 0.00%
Production and Investment Tax Credits | 0.00% | 0.00% | 0.00% | 0.00%
Reversal of Origination Flow-Through | 0.60% | 2.70% | 0.70% |
AFUDC Equity | (1.50%) |  | (1.60%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | (0.10%) | (4.10%) | 0.00% | (0.40%)
Effective Income Tax Rate | 18.30% | (16.50%) | 18.20% | 10.60%
PSO |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | 3.20% | (2.90%) | 3.00% | 0.00%
Tax Reform Excess ADIT Reversal | (2.70%) | (3.40%) | (3.10%) | (2.80%)
Remeasurement of Excess ADIT | (41.40%) | 0.00% | (23.50%) | (116.80%)
Production and Investment Tax Credits | (69.30%) | (70.60%) | (51.30%) | (61.30%)
Reversal of Origination Flow-Through | 0.30% | 0.30% | 0.20% |
AFUDC Equity | (1.40%) |  | (1.00%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | 0.20% | (1.50%) | 0.10% | (0.40%)
Effective Income Tax Rate | (90.10%) | (57.10%) | (54.60%) | (160.30%)
SWEPCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
U.S. Federal Statutory Rate | 21.00% | 21.00% | 21.00% | 21.00%
State and Local Income Taxes, Net | (2.80%) | (0.10%) | (2.20%) | (2.40%)
Tax Reform Excess ADIT Reversal | 2.50% | 2.00% | 0.10% | (1.50%)
Remeasurement of Excess ADIT | (79.40%) | 0.00% | (45.70%) | 303.00%
Production and Investment Tax Credits | (40.70%) | 15.90% | (36.60%) | 69.30%
Reversal of Origination Flow-Through | 0.90% | (0.40%) | 0.80% |
AFUDC Equity | (1.50%) |  | (1.40%) |
Flow-Through of CAMT | 0.00% |  |  |
Other | (0.90%) | 0.50% | (0.20%) | (1.20%)
Effective Income Tax Rate | (100.90%) | 38.90% | (64.20%) | 388.20%

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