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BENEFIT PLANS - Schedule of Defined Benefit Assumptions (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
AEP TEXAS INC. |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
APPALACHIAN POWER COMPANY |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
INDIANA MICHIGAN POWER COMPANY |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
OHIO POWER COMPANY |  |  |
Health Care Trend Rates |  |  |
Initial | 6.50% | 7.00% |
Ultimate | 4.50% | 4.50% |
Year Ultimate Reached | 2029 | 2030 |
Pension Plans |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.55% | 5.05% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.10% | 5.05% | 5.05%
Pension Plans | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | AEP TEXAS INC. |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.70% | 5.20% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.25% | 5.20% | 5.15%
Pension Plans | AEP TEXAS INC. | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | AEP TEXAS INC. | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | APPALACHIAN POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.55% | 4.95% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.10% | 4.95% | 4.90%
Pension Plans | APPALACHIAN POWER COMPANY | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | APPALACHIAN POWER COMPANY | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.55% | 5.00% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.10% | 5.00% | 5.00%
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | INDIANA MICHIGAN POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.50% | 5.05% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.10% | 5.05% | 5.00%
Pension Plans | INDIANA MICHIGAN POWER COMPANY | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | INDIANA MICHIGAN POWER COMPANY | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 5.70% | 5.20% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.20% | 5.20% | 5.15%
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
Pension Plans | OHIO POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.65% | 5.15% |
Interest Crediting Rate | 4.55% | 4.00% |
Rate of Compensation Increase | 6.00% | 5.45% |
Assumption |  |  |
Discount Rate | 5.20% | 5.50% | 2.90%
Interest Crediting Rate | 4.05% | 4.25% | 4.00%
Expected Return on Plan Assets | 7.30% | 7.50% | 5.25%
Rate of Compensation Increase | 5.50% | 5.45% | 5.35%
Pension Plans | OHIO POWER COMPANY | Minimum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 3.00% |  |
Pension Plans | OHIO POWER COMPANY | Maximum |  |  |
Assumption |  |  |
Rate of Compensation Increase | 11.50% |  |
OPEB |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | AEP TEXAS INC. |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | APPALACHIAN POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | INDIANA MICHIGAN POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%
OPEB | OHIO POWER COMPANY |  |  |
Assumption |  |  |
Discount Rate | 5.60% | 5.15% |
Assumption |  |  |
Discount Rate | 5.15% | 5.50% | 2.90%
Expected Return on Plan Assets | 6.75% | 7.25% | 5.50%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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