INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details)
|
3 Months Ended |
6 Months Ended |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 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 |
3.50%
|
0.60%
|
2.20%
|
0.90%
|
| Tax Reform Excess ADIT Reversal |
(3.20%)
|
(0.40%)
|
(3.20%)
|
(1.40%)
|
| Remeasurement of Excess ADIT |
|
(37.00%)
|
|
(19.50%)
|
| Production and Investment Tax Credits |
(13.00%)
|
(6.70%)
|
(11.70%)
|
(6.60%)
|
| Reversal of Origination Flow-Through |
0.80%
|
0.00%
|
0.80%
|
0.20%
|
| AFUDC Equity |
(1.60%)
|
(1.00%)
|
(1.60%)
|
(1.10%)
|
| Flow-Through of CAMT |
|
(0.30%)
|
(1.40%)
|
|
| Other |
(1.00%)
|
(0.40%)
|
(0.60%)
|
0.10%
|
| Effective Income Tax Rate |
6.50%
|
(24.20%)
|
5.50%
|
(6.40%)
|
| AEP TEXAS INC. |
|
|
|
|
| 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%
|
0.60%
|
0.60%
|
| Tax Reform Excess ADIT Reversal |
(1.50%)
|
(2.10%)
|
(1.50%)
|
(2.80%)
|
| 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 |
0.10%
|
0.10%
|
0.10%
|
0.10%
|
| AFUDC Equity |
(1.60%)
|
(1.20%)
|
(1.60%)
|
(1.10%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
0.20%
|
0.10%
|
0.00%
|
(0.10%)
|
| Effective Income Tax Rate |
18.70%
|
18.70%
|
18.50%
|
17.60%
|
| AEP TRANSMISSION COMPANY, LLC |
|
|
|
|
| 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 |
2.40%
|
2.50%
|
2.40%
|
2.50%
|
| Tax Reform Excess ADIT Reversal |
0.20%
|
0.60%
|
0.20%
|
0.40%
|
| Remeasurement of Excess ADIT |
|
(54.30%)
|
|
(34.40%)
|
| Production and Investment Tax Credits |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Reversal of Origination Flow-Through |
0.20%
|
0.20%
|
0.20%
|
0.20%
|
| AFUDC Equity |
(1.90%)
|
(0.80%)
|
(1.90%)
|
(1.10%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
(0.10%)
|
0.00%
|
0.10%
|
0.00%
|
| Effective Income Tax Rate |
21.80%
|
(30.80%)
|
22.00%
|
(11.40%)
|
| APPALACHIAN POWER COMPANY |
|
|
|
|
| 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 |
(0.50%)
|
0.80%
|
(0.20%)
|
1.00%
|
| Tax Reform Excess ADIT Reversal |
(5.40%)
|
(2.00%)
|
(4.90%)
|
(2.40%)
|
| Remeasurement of Excess ADIT |
|
(26.00%)
|
|
(8.10%)
|
| Production and Investment Tax Credits |
(13.80%)
|
(0.10%)
|
(5.60%)
|
(0.10%)
|
| Reversal of Origination Flow-Through |
2.30%
|
(4.10%)
|
2.00%
|
(1.80%)
|
| AFUDC Equity |
(1.00%)
|
(0.90%)
|
(0.90%)
|
(0.70%)
|
| Flow-Through of CAMT |
|
(3.40%)
|
(6.80%)
|
|
| Other |
(0.60%)
|
0.00%
|
0.10%
|
0.10%
|
| Effective Income Tax Rate |
2.00%
|
(14.70%)
|
4.70%
|
9.00%
|
| INDIANA MICHIGAN POWER COMPANY |
|
|
|
|
| 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 |
3.80%
|
1.10%
|
3.80%
|
2.00%
|
| Tax Reform Excess ADIT Reversal |
(2.60%)
|
2.80%
|
(2.50%)
|
0.20%
|
| Remeasurement of Excess ADIT |
|
(40.80%)
|
|
(24.10%)
|
| Production and Investment Tax Credits |
(13.70%)
|
(18.70%)
|
(10.10%)
|
(15.80%)
|
| Reversal of Origination Flow-Through |
1.50%
|
1.80%
|
1.40%
|
1.80%
|
| AFUDC Equity |
(0.80%)
|
(0.80%)
|
(0.70%)
|
(0.70%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
(0.70%)
|
0.00%
|
(0.40%)
|
0.00%
|
| Effective Income Tax Rate |
8.50%
|
(33.60%)
|
12.50%
|
(15.60%)
|
| OHIO POWER COMPANY |
|
|
|
|
| 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%
|
1.00%
|
1.00%
|
1.30%
|
| Tax Reform Excess ADIT Reversal |
(11.30%)
|
(2.70%)
|
(11.30%)
|
(3.20%)
|
| 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 |
0.60%
|
0.60%
|
0.60%
|
0.70%
|
| AFUDC Equity |
(1.80%)
|
(1.50%)
|
(1.80%)
|
(1.60%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
0.40%
|
(0.10%)
|
0.10%
|
0.00%
|
| Effective Income Tax Rate |
9.90%
|
18.30%
|
9.60%
|
18.20%
|
| PUBLIC SERVICE COMPANY OF OKLAHOMA |
|
|
|
|
| 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 |
3.00%
|
3.20%
|
4.60%
|
3.00%
|
| Tax Reform Excess ADIT Reversal |
(6.70%)
|
(2.70%)
|
68.60%
|
(3.10%)
|
| Remeasurement of Excess ADIT |
|
(41.40%)
|
|
(23.50%)
|
| Production and Investment Tax Credits |
(156.30%)
|
(69.30%)
|
2286.20%
|
(51.30%)
|
| Reversal of Origination Flow-Through |
0.30%
|
0.30%
|
(2.90%)
|
0.20%
|
| AFUDC Equity |
(1.40%)
|
(1.40%)
|
14.20%
|
(1.00%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
(5.40%)
|
0.20%
|
8.30%
|
0.10%
|
| Effective Income Tax Rate |
(145.50%)
|
(90.10%)
|
2400.00%
|
(54.60%)
|
| SOUTHWESTERN ELECTRIC POWER COMPANY |
|
|
|
|
| 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 |
(7.70%)
|
(2.80%)
|
(12.80%)
|
(2.20%)
|
| Tax Reform Excess ADIT Reversal |
(4.10%)
|
2.50%
|
(6.80%)
|
0.10%
|
| Remeasurement of Excess ADIT |
|
(79.40%)
|
|
(45.70%)
|
| Production and Investment Tax Credits |
(110.80%)
|
(40.70%)
|
(186.00%)
|
(36.60%)
|
| Reversal of Origination Flow-Through |
1.10%
|
0.90%
|
1.80%
|
0.80%
|
| AFUDC Equity |
(2.70%)
|
(1.50%)
|
(4.40%)
|
(1.40%)
|
| Flow-Through of CAMT |
|
0.00%
|
0.00%
|
|
| Other |
(1.60%)
|
(0.90%)
|
1.20%
|
(0.20%)
|
| Effective Income Tax Rate |
(104.80%)
|
(100.90%)
|
(186.00%)
|
(64.20%)
|