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%

Interest Crediting Rate used to determine benefit obligation of defined benefit plan.

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- Definition

Interest Crediting Rate used to determine net periodic benefit cost of defined benefit plan.

+ References

No definition available.

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- References

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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

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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

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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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

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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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

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

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- Definition

Year ultimate health care cost trend rate is expected to be reached, in YYYY format.

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