INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details)
|
3 Months Ended |
9 Months Ended |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
| 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%)
|
1.20%
|
1.00%
|
1.00%
|
| Tax Reform Excess ADIT Reversal |
(2.40%)
|
(2.50%)
|
(2.90%)
|
(1.80%)
|
| Remeasurement of Excess ADIT |
|
|
|
(12.40%)
|
| Production and Investment Tax Credits |
(6.70%)
|
(7.90%)
|
(9.50%)
|
(7.10%)
|
| Reversal of Origination Flow-Through |
(0.40%)
|
1.30%
|
|
0.60%
|
| AFUDC Equity |
(1.40%)
|
(1.60%)
|
(1.50%)
|
(1.20%)
|
| Flow-Through of CAMT |
|
0.60%
|
(0.80%)
|
0.20%
|
| Other |
(0.20%)
|
0.10%
|
(0.10%)
|
0.10%
|
| Effective Income Tax Rate |
9.30%
|
12.20%
|
7.20%
|
0.40%
|
| 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 |
0.30%
|
0.60%
|
0.50%
|
0.60%
|
| Tax Reform Excess ADIT Reversal |
(0.70%)
|
(2.30%)
|
(1.10%)
|
(2.60%)
|
| Remeasurement of Excess ADIT |
|
|
|
0.00%
|
| Production and Investment Tax Credits |
(0.10%)
|
(0.10%)
|
(0.10%)
|
(0.10%)
|
| Reversal of Origination Flow-Through |
0.00%
|
0.10%
|
|
0.10%
|
| AFUDC Equity |
(3.90%)
|
(1.80%)
|
(2.50%)
|
(1.40%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
(0.10%)
|
0.10%
|
(0.10%)
|
0.00%
|
| Effective Income Tax Rate |
16.50%
|
17.60%
|
17.70%
|
17.60%
|
| 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 |
2.30%
|
2.50%
|
2.40%
|
2.50%
|
| Tax Reform Excess ADIT Reversal |
0.20%
|
0.20%
|
0.20%
|
0.40%
|
| Remeasurement of Excess ADIT |
|
|
|
(25.50%)
|
| Production and Investment Tax Credits |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Reversal of Origination Flow-Through |
(0.30%)
|
0.30%
|
|
0.20%
|
| AFUDC Equity |
(1.80%)
|
(2.50%)
|
(1.80%)
|
(1.50%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
0.10%
|
0.00%
|
0.00%
|
0.10%
|
| Effective Income Tax Rate |
21.50%
|
21.50%
|
21.80%
|
(2.80%)
|
| 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 |
(3.40%)
|
(1.20%)
|
(1.30%)
|
0.40%
|
| Tax Reform Excess ADIT Reversal |
(4.90%)
|
(3.50%)
|
(4.90%)
|
(2.70%)
|
| Remeasurement of Excess ADIT |
|
|
|
(5.90%)
|
| Production and Investment Tax Credits |
(3.10%)
|
0.10%
|
(4.80%)
|
0.00%
|
| Reversal of Origination Flow-Through |
(3.30%)
|
6.70%
|
|
0.50%
|
| AFUDC Equity |
(0.60%)
|
(0.50%)
|
(0.80%)
|
(0.70%)
|
| Flow-Through of CAMT |
|
6.20%
|
(4.50%)
|
1.70%
|
| Other |
(0.40%)
|
(0.70%)
|
0.20%
|
0.00%
|
| Effective Income Tax Rate |
5.30%
|
28.10%
|
4.90%
|
14.30%
|
| 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 |
(0.40%)
|
2.80%
|
2.50%
|
2.40%
|
| Tax Reform Excess ADIT Reversal |
(2.20%)
|
(5.50%)
|
(2.40%)
|
(2.50%)
|
| Remeasurement of Excess ADIT |
|
|
|
(12.80%)
|
| Production and Investment Tax Credits |
(13.10%)
|
(26.60%)
|
(11.00%)
|
(20.90%)
|
| Reversal of Origination Flow-Through |
(1.00%)
|
2.20%
|
|
2.00%
|
| AFUDC Equity |
(0.10%)
|
(1.10%)
|
(0.60%)
|
(0.90%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
0.80%
|
(0.80%)
|
0.80%
|
(0.30%)
|
| Effective Income Tax Rate |
5.00%
|
(8.00%)
|
10.30%
|
(12.00%)
|
| 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 |
1.10%
|
1.00%
|
1.00%
|
1.20%
|
| Tax Reform Excess ADIT Reversal |
(8.90%)
|
(2.70%)
|
(10.50%)
|
(3.00%)
|
| Remeasurement of Excess ADIT |
|
|
|
0.00%
|
| Production and Investment Tax Credits |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Reversal of Origination Flow-Through |
(0.80%)
|
0.60%
|
|
0.60%
|
| AFUDC Equity |
0.80%
|
(1.80%)
|
(0.90%)
|
(1.70%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
0.00%
|
(0.30%)
|
0.20%
|
0.00%
|
| Effective Income Tax Rate |
13.20%
|
17.80%
|
10.80%
|
18.10%
|
| 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 |
1.70%
|
3.00%
|
1.70%
|
3.00%
|
| Tax Reform Excess ADIT Reversal |
(1.00%)
|
(4.80%)
|
(1.80%)
|
(4.10%)
|
| Remeasurement of Excess ADIT |
|
|
|
(8.80%)
|
| Production and Investment Tax Credits |
(12.70%)
|
(50.60%)
|
(40.10%)
|
(50.90%)
|
| Reversal of Origination Flow-Through |
0.00%
|
0.20%
|
|
0.20%
|
| AFUDC Equity |
(0.80%)
|
(1.20%)
|
(1.00%)
|
(1.10%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
0.00%
|
0.10%
|
0.00%
|
0.00%
|
| Effective Income Tax Rate |
8.20%
|
(32.30%)
|
(20.20%)
|
(40.70%)
|
| 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 |
(5.50%)
|
(3.90%)
|
(7.20%)
|
(3.30%)
|
| Tax Reform Excess ADIT Reversal |
(2.10%)
|
(3.20%)
|
(3.10%)
|
(2.00%)
|
| Remeasurement of Excess ADIT |
|
|
|
(17.20%)
|
| Production and Investment Tax Credits |
(22.40%)
|
(27.50%)
|
(59.40%)
|
(31.00%)
|
| Reversal of Origination Flow-Through |
(0.30%)
|
0.70%
|
|
0.70%
|
| AFUDC Equity |
(1.00%)
|
(1.10%)
|
(1.80%)
|
(1.30%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
0.00%
|
| Other |
(0.20%)
|
0.00%
|
0.30%
|
0.20%
|
| Effective Income Tax Rate |
(10.50%)
|
(14.00%)
|
(50.20%)
|
(32.90%)
|