XML 160 R89.htm IDEA: XBRL DOCUMENT
v3.25.0.1

BENEFIT PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Retirement Benefits [Abstract] |
Actuarial Assumptions | The weighted-average assumptions used in the measurement of the Registrants’ benefit obligations are shown in the following tables:
|  | Pension Plans |  | OPEB
|  | December 31,
Assumption |  | 2024 |  | 2023 |  | 2024 |  | 2023
Discount Rate |  | 5.65 | % |  | 5.15 | % |  | 5.60 | % |  | 5.15 | %
Interest Crediting Rate |  | 4.55 | % |  | 4.00 | % |  | NA |  | NA
NA Not applicable.
Assumption – Rate of Compensation Increase (a) - Pension Plans
|  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
December 31, 2024 |  | 5.55 | % |  | 5.70 | % |  | 5.55 | % |  | 5.50 | % |  | 6.00 | % |  | 5.70 | % |  | 5.55 | %
December 31, 2023 |  | 5.05 | % |  | 5.20 | % |  | 4.95 | % |  | 5.05 | % |  | 5.45 | % |  | 5.20 | % |  | 5.00 | %
(a)Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees. The weighted-average assumptions used in the measurement of each Registrants’ benefit costs are shown in the following tables:
|  | Pension Plans |  | OPEB
|  | Year Ended December 31,
Assumption |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Discount Rate |  | 5.20 | % |  | 5.50 | % |  | 2.90 | % |  | 5.15 | % |  | 5.50 | % |  | 2.90 | %
Interest Crediting Rate |  | 4.05 | % |  | 4.25 | % |  | 4.00 | % |  | NA |  | NA |  | NA
Expected Return on Plan Assets |  | 7.30 | % |  | 7.50 | % |  | 5.25 | % |  | 6.75 | % |  | 7.25 | % |  | 5.50 | %
NA Not applicable.
Assumption – Rate of Compensation Increase (a) - Pension Plans
|  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
December 31, 2024 |  | 5.10 | % |  | 5.25 | % |  | 5.10 | % |  | 5.10 | % |  | 5.50 | % |  | 5.20 | % |  | 5.10 | %
December 31, 2023 |  | 5.05 | % |  | 5.20 | % |  | 4.95 | % |  | 5.05 | % |  | 5.45 | % |  | 5.20 | % |  | 5.00 | %
December 31, 2022 |  | 5.05 | % |  | 5.15 | % |  | 4.90 | % |  | 5.00 | % |  | 5.35 | % |  | 5.15 | % |  | 5.00 | %
(a)Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.
Health Care Trend Rates | The health care trend rate assumptions used for OPEB plans measurement purposes are shown below:
Health Care Trend Rates |  | December 31, 2024 |  | December 31, 2023
Initial |  | 6.50 | % |  | 7.00 | %
Ultimate |  | 4.50 | % |  | 4.50 | %
Year Ultimate Reached |  | 2029 |  | 2030
Reconciliation of Changes in Benefit Obligations and Fair Value of Assets |
2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Change in Benefit Obligation |  | (in millions)
Benefit Obligation as of January 1, |  | $ | 4,161.6 |  |  | $ | 343.1 |  |  | $ | 504.1 |  |  | $ | 477.0 |  |  | $ | 378.4 |  |  | $ | 202.2 |  |  | $ | 261.2 |
Service Cost |  | 100.6 |  |  | 8.9 |  |  | 9.5 |  |  | 13.0 |  |  | 9.2 |  |  | 5.9 |  |  | 7.8 |
Interest Cost |  | 207.4 |  |  | 17.3 |  |  | 24.7 |  |  | 23.9 |  |  | 18.8 |  |  | 10.1 |  |  | 12.5 |
Actuarial (Gain) Loss |  | (44.6) |  |  | 5.5 |  |  | (12.9) |  |  | (8.4) |  |  | (8.3) |  |  | 0.1 |  |  | (11.2) |
Settlements |  | (329.4) |  |  | (34.8) |  |  | (42.0) |  |  | (33.1) |  |  | (23.2) |  |  | (18.5) |  |  | (33.1) |
Benefit Payments |  | (223.8) |  |  | (17.3) |  |  | (30.4) |  |  | (22.6) |  |  | (24.2) |  |  | (9.6) |  |  | (9.4) |
Benefit Obligation as of December 31, |  | $ | 3,871.8 |  |  | $ | 322.7 |  |  | $ | 453.0 |  |  | $ | 449.8 |  |  | $ | 350.7 |  |  | $ | 190.2 |  |  | $ | 227.8 |
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets as of January 1, |  | $ | 4,118.2 |  |  | $ | 332.7 |  |  | $ | 549.8 |  |  | $ | 550.6 |  |  | $ | 419.5 |  |  | $ | 222.7 |  |  | $ | 227.5 |
Actual Gain on Plan Assets |  | 87.2 |  |  | 7.1 |  |  | 10.4 |  |  | 11.6 |  |  | 8.6 |  |  | 5.0 |  |  | 3.6 |
Company Contributions (a) |  | 14.0 |  |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.2 |
Settlements |  | (329.4) |  |  | (34.8) |  |  | (42.0) |  |  | (33.1) |  |  | (23.2) |  |  | (18.5) |  |  | (33.1) |
Benefit Payments |  | (223.8) |  |  | (17.3) |  |  | (30.4) |  |  | (22.6) |  |  | (24.2) |  |  | (9.6) |  |  | (9.4) |
Fair Value of Plan Assets as of December 31, |  | $ | 3,666.2 |  |  | $ | 288.1 |  |  | $ | 487.8 |  |  | $ | 506.5 |  |  | $ | 380.7 |  |  | $ | 199.7 |  |  | $ | 188.8 |
Funded (Underfunded) Status as of December 31, |  | $ | (205.6) |  |  | $ | (34.6) |  |  | $ | 34.8 |  |  | $ | 56.7 |  |  | $ | 30.0 |  |  | $ | 9.5 |  |  | $ | (39.0) |
2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Change in Benefit Obligation |  | (in millions)
Benefit Obligation as of January 1, |  | $ | 4,072.7 |  |  | $ | 334.1 |  |  | $ | 485.7 |  |  | $ | 466.8 |  |  | $ | 363.6 |  |  | $ | 192.3 |  |  | $ | 250.7 |
Service Cost |  | 94.3 |  |  | 8.2 |  |  | 9.1 |  |  | 11.9 |  |  | 8.4 |  |  | 5.5 |  |  | 7.7 |
Interest Cost |  | 219.2 |  |  | 18.3 |  |  | 26.4 |  |  | 24.9 |  |  | 19.8 |  |  | 10.7 |  |  | 13.9 |
Actuarial Loss |  | 144.0 |  |  | 20.1 |  |  | 23.2 |  |  | 8.5 |  |  | 17.5 |  |  | 13.6 |  |  | 16.8 |
Benefit Payments |  | (368.6) |  |  | (37.6) |  |  | (40.3) |  |  | (35.1) |  |  | (30.9) |  |  | (19.9) |  |  | (27.9) |
Benefit Obligation as of December 31, |  | $ | 4,161.6 |  |  | $ | 343.1 |  |  | $ | 504.1 |  |  | $ | 477.0 |  |  | $ | 378.4 |  |  | $ | 202.2 |  |  | $ | 261.2 |
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets as of January 1, |  | $ | 4,124.7 |  |  | $ | 335.1 |  |  | $ | 531.7 |  |  | $ | 533.7 |  |  | $ | 406.4 |  |  | $ | 218.5 |  |  | $ | 231.3 |
Actual Gain on Plan Assets |  | 353.8 |  |  | 34.8 |  |  | 58.4 |  |  | 51.5 |  |  | 44.0 |  |  | 24.0 |  |  | 23.9 |
Company Contributions (a) |  | 8.3 |  |  | 0.4 |  |  | — |  |  | 0.5 |  |  | — |  |  | 0.1 |  |  | 0.2 |
Benefit Payments |  | (368.6) |  |  | (37.6) |  |  | (40.3) |  |  | (35.1) |  |  | (30.9) |  |  | (19.9) |  |  | (27.9) |
Fair Value of Plan Assets as of December 31, |  | $ | 4,118.2 |  |  | $ | 332.7 |  |  | $ | 549.8 |  |  | $ | 550.6 |  |  | $ | 419.5 |  |  | $ | 222.7 |  |  | $ | 227.5 |
Funded (Underfunded) Status as of December 31, |  | $ | (43.4) |  |  | $ | (10.4) |  |  | $ | 45.7 |  |  | $ | 73.6 |  |  | $ | 41.1 |  |  | $ | 20.5 |  |  | $ | (33.7) |
(a)No contributions were made to the qualified pension plan for the years ended December 31, 2024 and 2023, respectively. Contributions to the non-qualified pension plans were $14 million and $8 million for the years ended December 31, 2024 and 2023, respectively. OPEB
2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Change in Benefit Obligation |  | (in millions)
Benefit Obligation as of January 1, |  | $ | 849.5 |  |  | $ | 66.4 |  |  | $ | 134.6 |  |  | $ | 98.8 |  |  | $ | 85.9 |  |  | $ | 43.7 |  |  | $ | 53.7 |
Service Cost |  | 4.5 |  |  | 0.3 |  |  | 0.5 |  |  | 0.6 |  |  | 0.4 |  |  | 0.3 |  |  | 0.4 |
Interest Cost |  | 42.0 |  |  | 3.3 |  |  | 6.6 |  |  | 4.8 |  |  | 4.2 |  |  | 2.1 |  |  | 2.7 |
Actuarial (Gain) Loss |  | (192.3) |  |  | (15.4) |  |  | (30.4) |  |  | (24.7) |  |  | (20.7) |  |  | (10.4) |  |  | (11.5) |
Special/Contractual Termination Benefits |  | 3.5 |  |  | 0.4 |  |  | 0.6 |  |  | 0.4 |  |  | 0.3 |  |  | 0.1 |  |  | 0.3 |
Benefit Payments |  | (105.8) |  |  | (8.3) |  |  | (16.7) |  |  | (13.4) |  |  | (11.3) |  |  | (5.8) |  |  | (7.4) |
Participant Contributions |  | 44.9 |  |  | 3.5 |  |  | 6.8 |  |  | 6.0 |  |  | 4.6 |  |  | 2.6 |  |  | 3.3 |
Medicare Subsidy |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Benefit Obligation as of December 31, |  | $ | 646.6 |  |  | $ | 50.2 |  |  | $ | 102.1 |  |  | $ | 72.5 |  |  | $ | 63.4 |  |  | $ | 32.6 |  |  | $ | 41.5 |
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets as of January 1, |  | $ | 1,673.3 |  |  | $ | 137.5 |  |  | $ | 243.0 |  |  | $ | 204.6 |  |  | $ | 177.8 |  |  | $ | 90.2 |  |  | $ | 111.1 |
Actual Gain on Plan Assets |  | 159.2 |  |  | 14.0 |  |  | 22.5 |  |  | 14.7 |  |  | 14.1 |  |  | 8.3 |  |  | 14.2 |
Company Contributions |  | 4.3 |  |  | — |  |  | 0.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Participant Contributions |  | 44.9 |  |  | 3.5 |  |  | 6.8 |  |  | 6.0 |  |  | 4.6 |  |  | 2.6 |  |  | 3.3 |
Benefit Payments |  | (105.8) |  |  | (8.3) |  |  | (16.7) |  |  | (13.4) |  |  | (11.3) |  |  | (5.8) |  |  | (7.4) |
Fair Value of Plan Assets as of December 31, |  | $ | 1,775.9 |  |  | $ | 146.7 |  |  | $ | 256.4 |  |  | $ | 211.9 |  |  | $ | 185.2 |  |  | $ | 95.3 |  |  | $ | 121.2 |
Funded Status as of December 31, |  | $ | 1,129.3 |  |  | $ | 96.5 |  |  | $ | 154.3 |  |  | $ | 139.4 |  |  | $ | 121.8 |  |  | $ | 62.7 |  |  | $ | 79.7 |
2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Change in Benefit Obligation |  | (in millions)
Benefit Obligation as of January 1, |  | $ | 872.6 |  |  | $ | 68.6 |  |  | $ | 140.7 |  |  | $ | 101.9 |  |  | $ | 88.9 |  |  | $ | 45.7 |  |  | $ | 55.1 |
Service Cost |  | 4.6 |  |  | 0.3 |  |  | 0.5 |  |  | 0.6 |  |  | 0.4 |  |  | 0.3 |  |  | 0.4 |
Interest Cost |  | 46.2 |  |  | 3.6 |  |  | 7.4 |  |  | 5.4 |  |  | 4.7 |  |  | 2.4 |  |  | 2.9 |
Actuarial Loss |  | 19.8 |  |  | 1.2 |  |  | 0.9 |  |  | 3.2 |  |  | 2.2 |  |  | 0.4 |  |  | 1.2 |
Benefit Payments |  | (137.8) |  |  | (10.7) |  |  | (21.6) |  |  | (18.3) |  |  | (15.0) |  |  | (7.6) |  |  | (8.8) |
Participant Contributions |  | 43.6 |  |  | 3.4 |  |  | 6.6 |  |  | 6.0 |  |  | 4.7 |  |  | 2.5 |  |  | 2.9 |
Medicare Subsidy |  | 0.5 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Benefit Obligation as of December 31, |  | $ | 849.5 |  |  | $ | 66.4 |  |  | $ | 134.6 |  |  | $ | 98.8 |  |  | $ | 85.9 |  |  | $ | 43.7 |  |  | $ | 53.7 |
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets as of January 1, |  | $ | 1,549.3 |  |  | $ | 128.3 |  |  | $ | 228.6 |  |  | $ | 190.5 |  |  | $ | 166.2 |  |  | $ | 85.4 |  |  | $ | 103.0 |
Actual Gain on Plan Assets |  | 213.2 |  |  | 16.5 |  |  | 28.1 |  |  | 26.4 |  |  | 21.9 |  |  | 9.9 |  |  | 14.0 |
Company Contributions |  | 5.0 |  |  | — |  |  | 1.3 |  |  | — |  |  | — |  |  | — |  |  | — |
Participant Contributions |  | 43.6 |  |  | 3.4 |  |  | 6.6 |  |  | 6.0 |  |  | 4.7 |  |  | 2.5 |  |  | 2.9 |
Benefit Payments |  | (137.8) |  |  | (10.7) |  |  | (21.6) |  |  | (18.3) |  |  | (15.0) |  |  | (7.6) |  |  | (8.8) |
Fair Value of Plan Assets as of December 31, |  | $ | 1,673.3 |  |  | $ | 137.5 |  |  | $ | 243.0 |  |  | $ | 204.6 |  |  | $ | 177.8 |  |  | $ | 90.2 |  |  | $ | 111.1 |
Funded Status as of December 31, |  | $ | 823.8 |  |  | $ | 71.1 |  |  | $ | 108.4 |  |  | $ | 105.8 |  |  | $ | 91.9 |  |  | $ | 46.5 |  |  | $ | 57.4 |
Benefit Amounts Recognized on the Balance Sheets | Amounts Included on the Balance Sheets Related to Funded Status Pension Plans
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Other Noncurrent Assets - Employee Benefits and Pension Assets |  | $ | — |  |  | $ | — |  |  | $ | 35.2 |  |  | $ | 58.2 |  |  | $ | 30.3 |  |  | $ | 10.9 |  |  | $ | — |
Other Current Liabilities – Accrued Short-term Benefit Liability |  | (5.2) |  |  | (0.3) |  |  | — |  |  | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability |  | (200.4) |  |  | (34.3) |  |  | (0.4) |  |  | (1.5) |  |  | (0.3) |  |  | (1.3) |  |  | (38.9) |
Funded (Underfunded) Status |  | $ | (205.6) |  |  | $ | (34.6) |  |  | $ | 34.8 |  |  | $ | 56.7 |  |  | $ | 30.0 |  |  | $ | 9.5 |  |  | $ | (39.0) |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Other Noncurrent Assets - Employee Benefits and Pension Assets |  | $ | 17.3 |  |  | $ | 0.1 |  |  | $ | 46.0 |  |  | $ | 74.8 |  |  | $ | 41.4 |  |  | $ | 21.8 |  |  | $ | — |
Other Current Liabilities – Accrued Short-term Benefit Liability |  | (6.7) |  |  | (0.3) |  |  | — |  |  | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability |  | (54.0) |  |  | (10.2) |  |  | (0.3) |  |  | (1.2) |  |  | (0.3) |  |  | (1.2) |  |  | (33.6) |
Funded (Underfunded) Status |  | $ | (43.4) |  |  | $ | (10.4) |  |  | $ | 45.7 |  |  | $ | 73.6 |  |  | $ | 41.1 |  |  | $ | 20.5 |  |  | $ | (33.7) |
OPEB
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Other Noncurrent Assets - Employee Benefits and Pension Assets |  | $ | 1,130.8 |  |  | $ | 96.5 |  |  | $ | 168.7 |  |  | $ | 139.4 |  |  | $ | 121.8 |  |  | $ | 62.7 |  |  | $ | 79.7 |
Other Current Liabilities – Accrued Short-term Benefit Liability |  | (2.2) |  |  | — |  |  | (1.4) |  |  | — |  |  | — |  |  | — |  |  | — |
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability |  | 0.7 |  |  | — |  |  | (13.0) |  |  | — |  |  | — |  |  | — |  |  | — |
Funded Status |  | $ | 1,129.3 |  |  | $ | 96.5 |  |  | $ | 154.3 |  |  | $ | 139.4 |  |  | $ | 121.8 |  |  | $ | 62.7 |  |  | $ | 79.7 |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Other Noncurrent Assets - Employee Benefits and Pension Assets |  | $ | 838.0 |  |  | $ | 71.1 |  |  | $ | 125.6 |  |  | $ | 105.8 |  |  | $ | 91.9 |  |  | $ | 46.5 |  |  | $ | 57.4 |
Other Current Liabilities – Accrued Short-term Benefit Liability |  | (2.4) |  |  | — |  |  | (1.6) |  |  | — |  |  | — |  |  | — |  |  | — |
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability |  | (11.8) |  |  | — |  |  | (15.6) |  |  | — |  |  | — |  |  | — |  |  | — |
Funded Status |  | $ | 823.8 |  |  | $ | 71.1 |  |  | $ | 108.4 |  |  | $ | 105.8 |  |  | $ | 91.9 |  |  | $ | 46.5 |  |  | $ | 57.4 |
Amounts Included in AOCI and Regulatory Assets | The following tables show the components of the plans included in Regulatory Assets, Deferred Income Taxes and AOCI and the items attributable to the change in these components: Pension Plans
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Net Actuarial Loss |  | $ | 1,153.5 |  |  | $ | 189.3 |  |  | $ | 112.1 |  |  | $ | 7.5 |  |  | $ | 140.9 |  |  | $ | 53.8 |  |  | $ | 82.9 |
Prior Service Cost |  | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Recorded as |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  | $ | 1,019.8 |  |  | $ | 176.7 |  |  | $ | 109.9 |  |  | $ | 17.5 |  |  | $ | 140.9 |  |  | $ | 53.8 |  |  | $ | 83.0 |
Deferred Income Taxes |  | 28.2 |  |  | 2.8 |  |  | 0.4 |  |  | (2.2) |  |  | — |  |  | — |  |  | — |
Net of Tax AOCI |  | 105.7 |  |  | 9.8 |  |  | 1.8 |  |  | (7.8) |  |  | — |  |  | — |  |  | (0.1) |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Net Actuarial (Gain) Loss |  | $ | 1,063.4 |  |  | $ | 175.2 |  |  | $ | 104.9 |  |  | $ | (5.8) |  |  | $ | 131.9 |  |  | $ | 46.7 |  |  | $ | 89.6 |
Prior Service Cost |  | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Recorded as |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  | $ | 938.6 |  |  | $ | 163.4 |  |  | $ | 102.6 |  |  | $ | 6.4 |  |  | $ | 131.9 |  |  | $ | 46.7 |  |  | $ | 89.7 |
Deferred Income Taxes |  | 26.4 |  |  | 2.7 |  |  | 0.4 |  |  | (2.6) |  |  | — |  |  | — |  |  | — |
Net of Tax AOCI |  | 98.6 |  |  | 9.1 |  |  | 1.9 |  |  | (9.6) |  |  | — |  |  | — |  |  | (0.1) |
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Net Actuarial (Gain) Loss |  | $ | (41.6) |  |  | $ | 1.6 |  |  | $ | (9.9) |  |  | $ | 2.3 |  |  | $ | (5.3) |  |  | $ | 4.7 |  |  | $ | — |
Prior Service Credit |  | (14.7) |  |  | (1.3) |  |  | (2.3) |  |  | (2.0) |  |  | (1.6) |  |  | (0.9) |  |  | (1.0) |
Recorded as |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  | $ | (55.4) |  |  | $ | 0.8 |  |  | $ | (2.0) |  |  | $ | (2.9) |  |  | $ | (6.9) |  |  | $ | 3.8 |  |  | $ | 0.5 |
Deferred Income Taxes |  | (0.1) |  |  | — |  |  | (2.2) |  |  | 0.7 |  |  | — |  |  | — |  |  | (0.3) |
Net of Tax AOCI |  | (0.8) |  |  | (0.5) |  |  | (8.0) |  |  | 2.5 |  |  | — |  |  | — |  |  | (1.2) |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Net Actuarial Loss |  | $ | 201.5 |  |  | $ | 22.1 |  |  | $ | 27.1 |  |  | $ | 28.7 |  |  | $ | 18.1 |  |  | $ | 17.5 |  |  | $ | 18.4 |
Prior Service Credit |  | (27.4) |  |  | (2.3) |  |  | (4.2) |  |  | (3.7) |  |  | (2.9) |  |  | (1.6) |  |  | (2.1) |
Recorded as |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  | $ | 106.1 |  |  | $ | 19.8 |  |  | $ | 13.2 |  |  | $ | 19.0 |  |  | $ | 15.2 |  |  | $ | 15.9 |  |  | $ | 10.2 |
Deferred Income Taxes |  | 14.3 |  |  | — |  |  | 2.0 |  |  | 1.3 |  |  | — |  |  | — |  |  | 1.3 |
Net of Tax AOCI |  | 53.7 |  |  | — |  |  | 7.7 |  |  | 4.7 |  |  | — |  |  | — |  |  | 4.8 |
Components of Change in Amounts Included in AOCI and Regulatory Assets |
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Actuarial Loss During the Year |  | $ | 188.0 |  |  | $ | 24.2 |  |  | $ | 19.4 |  |  | $ | 23.0 |  |  | $ | 15.8 |  |  | $ | 12.5 |  |  | $ | 2.7 |
Amortization of Actuarial Loss |  | (4.5) |  |  | (0.3) |  |  | (0.4) |  |  | (0.4) |  |  | (0.3) |  |  | (0.2) |  |  | (0.1) |
Amounts Recognized Due to Settlement |  | (93.4) |  |  | (9.8) |  |  | (11.8) |  |  | (9.3) |  |  | (6.5) |  |  | (5.2) |  |  | (9.3) |
Change for the Year Ended December 31, |  | $ | 90.1 |  |  | $ | 14.1 |  |  | $ | 7.2 |  |  | $ | 13.3 |  |  | $ | 9.0 |  |  | $ | 7.1 |  |  | $ | (6.7) |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Actuarial Loss During the Year |  | $ | 129.2 |  |  | $ | 13.4 |  |  | $ | 9.3 |  |  | $ | 1.2 |  |  | $ | 7.6 |  |  | $ | 7.9 |  |  | $ | 12.1 |
Amortization of Actuarial Loss |  | (1.4) |  |  | (0.1) |  |  | — |  |  | (0.1) |  |  | — |  |  | — |  |  | (0.1) |
Change for the Year Ended December 31, |  | $ | 127.8 |  |  | $ | 13.3 |  |  | $ | 9.3 |  |  | $ | 1.1 |  |  | $ | 7.6 |  |  | $ | 7.9 |  |  | $ | 12.0 |
December 31, 2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Actuarial Gain During the Year |  | $ | (240.1) |  |  | $ | (20.3) |  |  | $ | (36.6) |  |  | $ | (25.9) |  |  | $ | (23.0) |  |  | $ | (12.6) |  |  | $ | (18.1) |
Amortization of Actuarial Loss |  | (3.0) |  |  | (0.2) |  |  | (0.4) |  |  | (0.5) |  |  | (0.4) |  |  | (0.2) |  |  | (0.3) |
Amortization of Prior Service Credit |  | 12.7 |  |  | 1.0 |  |  | 1.9 |  |  | 1.7 |  |  | 1.3 |  |  | 0.7 |  |  | 1.1 |
Change for the Year Ended December 31, |  | $ | (230.4) |  |  | $ | (19.5) |  |  | $ | (35.1) |  |  | $ | (24.7) |  |  | $ | (22.1) |  |  | $ | (12.1) |  |  | $ | (17.3) |
December 31, 2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Components |  | (in millions)
Actuarial Gain During the Year |  | $ | (83.7) |  |  | $ | (6.4) |  |  | $ | (11.1) |  |  | $ | (9.6) |  |  | $ | (7.9) |  |  | $ | (3.7) |  |  | $ | (5.6) |
Amortization of Actuarial Loss |  | (14.8) |  |  | (1.2) |  |  | (2.3) |  |  | (1.9) |  |  | (1.6) |  |  | (0.8) |  |  | (1.0) |
Amortization of Prior Service Credit |  | 63.1 |  |  | 5.3 |  |  | 9.2 |  |  | 8.7 |  |  | 6.3 |  |  | 4.0 |  |  | 4.9 |
Change for the Year Ended December 31, |  | $ | (35.4) |  |  | $ | (2.3) |  |  | $ | (4.2) |  |  | $ | (2.8) |  |  | $ | (3.2) |  |  | $ | (0.5) |  |  | $ | (1.7) |
Allocated Assets of Investments | All Level 1, 2, 3 and Other amounts can be allocated to the Registrant Subsidiaries using the percentages in the table below:
|  | Pension Plan |  | OPEB
|  | December 31,
Company |  | 2024 |  | 2023 |  | 2024 |  | 2023
AEP Texas |  | 7.9 | % |  | 8.1 | % |  | 8.3 | % |  | 8.2 | %
APCo |  | 13.3 | % |  | 13.4 | % |  | 14.4 | % |  | 14.5 | %
I&M |  | 13.8 | % |  | 13.4 | % |  | 11.9 | % |  | 12.2 | %
OPCo |  | 10.4 | % |  | 10.2 | % |  | 10.4 | % |  | 10.6 | %
PSO |  | 5.5 | % |  | 5.4 | % |  | 5.4 | % |  | 5.4 | %
SWEPCo |  | 5.2 | % |  | 5.5 | % |  | 6.8 | % |  | 6.6 | %
Assets within Fair Value Hierarchy | The following table presents the classification of pension plan assets for AEP within the fair value hierarchy as of December 31, 2024:
Asset Class |  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total |  | Year End Allocation
|  | (in millions) |  |
Equities (a): |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 327.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 327.0 |  |  | 8.9 | %
International |  | 290.2 |  |  | — |  |  | — |  |  | — |  |  | 290.2 |  |  | 7.9 | %
Common Collective Trusts (b) |  | 176.1 |  |  | — |  |  | — |  |  | 472.6 |  |  | 648.7 |  |  | 17.7 | %
Subtotal – Equities |  | 793.3 |  |  | — |  |  | — |  |  | 472.6 |  |  | 1,265.9 |  |  | 34.5 | %
Fixed Income (a): |  |  |  |  |  |  |  |  |  |  |  |
United States Government and Agency Securities |  | (2.3) |  |  | 865.6 |  |  | — |  |  | — |  |  | 863.3 |  |  | 23.6 | %
Corporate Debt |  | — |  |  | 719.2 |  |  | — |  |  | — |  |  | 719.2 |  |  | 19.6 | %
Foreign Debt |  | — |  |  | 136.1 |  |  | — |  |  | — |  |  | 136.1 |  |  | 3.7 | %
State and Local Government |  | — |  |  | 25.8 |  |  | — |  |  | — |  |  | 25.8 |  |  | 0.7 | %
Other – Asset Backed |  | — |  |  | 0.9 |  |  | — |  |  | — |  |  | 0.9 |  |  | — | %
Subtotal – Fixed Income |  | (2.3) |  |  | 1,747.6 |  |  | — |  |  | — |  |  | 1,745.3 |  |  | 47.6 | %
Infrastructure (b) |  | — |  |  | — |  |  | — |  |  | 112.9 |  |  | 112.9 |  |  | 3.1 | %
Real Estate (b) |  | — |  |  | — |  |  | — |  |  | 227.9 |  |  | 227.9 |  |  | 6.2 | %
Alternative Investments (b) |  | — |  |  | — |  |  | — |  |  | 223.8 |  |  | 223.8 |  |  | 6.1 | %
Cash and Cash Equivalents (b) |  | — |  |  | 41.3 |  |  | — |  |  | 27.2 |  |  | 68.5 |  |  | 1.9 | %
Other – Pending Transactions and Accrued Income (c) |  | — |  |  | — |  |  | — |  |  | 21.9 |  |  | 21.9 |  |  | 0.6 | %
Total |  | $ | 791.0 |  |  | $ | 1,788.9 |  |  | $ | — |  |  | $ | 1,086.3 |  |  | $ | 3,666.2 |  |  | 100.0 | %
(a)Includes investment securities loaned to borrowers under the securities lending program. See the “Investments Held in Trust for Future Liabilities” section of Note 1 for additional information. (b)Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share. (c)Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement. The following table presents the classification of OPEB plan assets for AEP within the fair value hierarchy as of December 31, 2024:
Asset Class |  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total |  | Year End Allocation
|  | (in millions) |  |
Equities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 616.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 616.8 |  |  | 34.7 | %
International |  | 267.2 |  |  | — |  |  | — |  |  | — |  |  | 267.2 |  |  | 15.0 | %
Common Collective Trusts (a) |  | 64.2 |  |  | — |  |  | — |  |  | 129.4 |  |  | 193.6 |  |  | 10.9 | %
Subtotal – Equities |  | 948.2 |  |  | — |  |  | — |  |  | 129.4 |  |  | 1,077.6 |  |  | 60.6 | %
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |
Common Collective Trust – Debt (a) |  | — |  |  | — |  |  | — |  |  | 132.9 |  |  | 132.9 |  |  | 7.5 | %
United States Government and Agency Securities |  | (0.5) |  |  | 157.6 |  |  | — |  |  | — |  |  | 157.1 |  |  | 8.9 | %
Corporate Debt |  | — |  |  | 132.3 |  |  | — |  |  | — |  |  | 132.3 |  |  | 7.5 | %
Foreign Debt |  | — |  |  | 27.1 |  |  | — |  |  | — |  |  | 27.1 |  |  | 1.5 | %
State and Local Government |  | 57.8 |  |  | 5.0 |  |  | — |  |  | — |  |  | 62.8 |  |  | 3.5 | %
Other – Asset Backed |  | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |  |  | — | %
Subtotal – Fixed Income |  | 57.3 |  |  | 322.2 |  |  | — |  |  | 132.9 |  |  | 512.4 |  |  | 28.9 | %
Trust Owned Life Insurance: |  |  |  |  |  |  |  |  |  |  |  |
International Equities |  | — |  |  | 23.1 |  |  | — |  |  | — |  |  | 23.1 |  |  | 1.3 | %
United States Bonds |  | — |  |  | 118.2 |  |  | — |  |  | — |  |  | 118.2 |  |  | 6.7 | %
Subtotal – Trust Owned Life Insurance |  | — |  |  | 141.3 |  |  | — |  |  | — |  |  | 141.3 |  |  | 8.0 | %
Cash and Cash Equivalents (a) |  | 27.6 |  |  | — |  |  | — |  |  | 3.1 |  |  | 30.7 |  |  | 1.7 | %
Other – Pending Transactions and Accrued Income (b) |  | — |  |  | — |  |  | — |  |  | 13.9 |  |  | 13.9 |  |  | 0.8 | %
Total |  | $ | 1,033.1 |  |  | $ | 463.5 |  |  | $ | — |  |  | $ | 279.3 |  |  | $ | 1,775.9 |  |  | 100.0 | %
(a)Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share. (b)Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement. The following table presents the classification of pension plan assets for AEP within the fair value hierarchy as of December 31, 2023:
Asset Class |  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total |  | Year End Allocation
|  | (in millions) |  |
Equities (a): |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 411.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 411.3 |  |  | 10.0 | %
International |  | 389.8 |  |  | — |  |  | — |  |  | — |  |  | 389.8 |  |  | 9.5 | %
Common Collective Trusts (b) |  | — |  |  | — |  |  | — |  |  | 420.9 |  |  | 420.9 |  |  | 10.2 | %
Subtotal – Equities |  | 801.1 |  |  | — |  |  | — |  |  | 420.9 |  |  | 1,222.0 |  |  | 29.7 | %
Fixed Income (a): |  |  |  |  |  |  |  |  |  |  |  |
United States Government and Agency Securities |  | 8.3 |  |  | 1,099.2 |  |  | — |  |  | — |  |  | 1,107.5 |  |  | 26.9 | %
Corporate Debt |  | — |  |  | 894.8 |  |  | — |  |  | — |  |  | 894.8 |  |  | 21.7 | %
Foreign Debt |  | — |  |  | 167.1 |  |  | — |  |  | — |  |  | 167.1 |  |  | 4.1 | %
State and Local Government |  | — |  |  | 38.7 |  |  | — |  |  | — |  |  | 38.7 |  |  | 0.9 | %
Other – Asset Backed |  | — |  |  | 1.3 |  |  | — |  |  | — |  |  | 1.3 |  |  | — | %
Subtotal – Fixed Income |  | 8.3 |  |  | 2,201.1 |  |  | — |  |  | — |  |  | 2,209.4 |  |  | 53.6 | %
Infrastructure (b) |  | — |  |  | — |  |  | — |  |  | 101.4 |  |  | 101.4 |  |  | 2.5 | %
Real Estate (b) |  | — |  |  | — |  |  | — |  |  | 239.3 |  |  | 239.3 |  |  | 5.8 | %
Alternative Investments (b) |  | — |  |  | — |  |  | — |  |  | 241.8 |  |  | 241.8 |  |  | 5.8 | %
Cash and Cash Equivalents (b) |  | — |  |  | 51.0 |  |  | — |  |  | 33.8 |  |  | 84.8 |  |  | 2.1 | %
Other – Pending Transactions and Accrued Income (c) |  | — |  |  | — |  |  | 0.1 |  |  | 19.4 |  |  | 19.5 |  |  | 0.5 | %
Total |  | $ | 809.4 |  |  | $ | 2,252.1 |  |  | $ | 0.1 |  |  | $ | 1,056.6 |  |  | $ | 4,118.2 |  |  | 100.0 | %
(a)Includes investment securities loaned to borrowers under the securities lending program. See the “Investments Held in Trust for Future Liabilities” section of Note 1 for additional information. (b)Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share. (c)Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement. The following table presents the classification of OPEB plan assets for AEP within the fair value hierarchy as of December 31, 2023:
Asset Class |  | Level 1 |  | Level 2 |  | Level 3 |  | Other |  | Total |  | Year End Allocation
|  | (in millions) |  |
Equities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 540.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 540.6 |  |  | 32.3 | %
International |  | 288.4 |  |  | — |  |  | — |  |  | — |  |  | 288.4 |  |  | 17.2 | %
Common Collective Trusts (a) |  | — |  |  | — |  |  | — |  |  | 131.6 |  |  | 131.6 |  |  | 7.9 | %
Subtotal – Equities |  | 829.0 |  |  | — |  |  | — |  |  | 131.6 |  |  | 960.6 |  |  | 57.4 | %
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |
Common Collective Trust – Debt (a) |  | — |  |  | — |  |  | — |  |  | 146.7 |  |  | 146.7 |  |  | 8.8 | %
United States Government and Agency Securities |  | 1.4 |  |  | 163.3 |  |  | — |  |  | — |  |  | 164.7 |  |  | 9.8 | %
Corporate Debt |  | — |  |  | 149.0 |  |  | — |  |  | — |  |  | 149.0 |  |  | 8.9 | %
Foreign Debt |  | — |  |  | 28.6 |  |  | — |  |  | — |  |  | 28.6 |  |  | 1.7 | %
State and Local Government |  | 41.5 |  |  | 7.8 |  |  | — |  |  | — |  |  | 49.3 |  |  | 3.0 | %
Other – Asset Backed |  | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |  |  | — | %
Subtotal – Fixed Income |  | 42.9 |  |  | 348.9 |  |  | — |  |  | 146.7 |  |  | 538.5 |  |  | 32.2 | %
Trust Owned Life Insurance: |  |  |  |  |  |  |  |  |  |  |  |
International Equities |  | — |  |  | 22.3 |  |  | — |  |  | — |  |  | 22.3 |  |  | 1.3 | %
United States Bonds |  | — |  |  | 130.0 |  |  | — |  |  | — |  |  | 130.0 |  |  | 7.8 | %
Subtotal – Trust Owned Life Insurance |  | — |  |  | 152.3 |  |  | — |  |  | — |  |  | 152.3 |  |  | 9.1 | %
Cash and Cash Equivalents (a) |  | 25.9 |  |  | — |  |  | — |  |  | 2.9 |  |  | 28.8 |  |  | 1.7 | %
Other – Pending Transactions and Accrued Income (b) |  | — |  |  | — |  |  | — |  |  | (6.9) |  |  | (6.9) |  |  | (0.4) | %
Total |  | $ | 897.8 |  |  | $ | 501.2 |  |  | $ | — |  |  | $ | 274.3 |  |  | $ | 1,673.3 |  |  | 100.0 | %
(a)Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share. (b)Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.
Accumulated Benefit Obligation | The accumulated benefit obligation for the pension plans is as follows:
Accumulated Benefit Obligation |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Qualified Pension Plan |  | $ | 3,602.4 |  |  | $ | 300.6 |  |  | $ | 434.3 |  |  | $ | 422.3 |  |  | $ | 326.4 |  |  | $ | 174.6 |  |  | $ | 209.5 |
Nonqualified Pension Plans |  | 46.9 |  |  | 2.1 |  |  | 0.2 |  |  | 0.9 |  |  | 0.1 |  |  | 1.1 |  |  | 1.0 |
Total as of December 31, 2024 |  | $ | 3,649.3 |  |  | $ | 302.7 |  |  | $ | 434.5 |  |  | $ | 423.2 |  |  | $ | 326.5 |  |  | $ | 175.7 |  |  | $ | 210.5 |
Accumulated Benefit Obligation |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Qualified Pension Plan |  | $ | 3,878.7 |  |  | $ | 321.1 |  |  | $ | 485.6 |  |  | $ | 450.3 |  |  | $ | 354.0 |  |  | $ | 186.6 |  |  | $ | 241.9 |
Nonqualified Pension Plans |  | 54.8 |  |  | 2.1 |  |  | 0.1 |  |  | 0.7 |  |  | 0.1 |  |  | 1.2 |  |  | 1.0 |
Total as of December 31, 2023 |  | $ | 3,933.5 |  |  | $ | 323.2 |  |  | $ | 485.7 |  |  | $ | 451.0 |  |  | $ | 354.1 |  |  | $ | 187.8 |  |  | $ | 242.9 |
Underfunded Projected Benefit Obligation | The tables below show the underfunded pension plans that had obligations in excess of plan assets. Projected Benefit Obligation
| AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
| (in millions)
Projected Benefit Obligation | $ | 3,871.8 |  |  | $ | 322.7 |  |  | $ | 0.5 |  |  | $ | 1.5 |  |  | $ | 0.4 |  |  | $ | 1.4 |  |  | $ | 227.8 |
Fair Value of Plan Assets | 3,666.2 |  |  | 288.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 188.8 |
Underfunded Projected Benefit Obligation as of December 31, 2024 | $ | (205.6) |  |  | $ | (34.6) |  |  | $ | (0.5) |  |  | $ | (1.5) |  |  | $ | (0.4) |  |  | $ | (1.4) |  |  | $ | (39.0) |
| AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
| (in millions)
Projected Benefit Obligation | $ | 60.7 |  |  | $ | 343.1 |  |  | $ | 0.4 |  |  | $ | 1.2 |  |  | $ | 0.3 |  |  | $ | 1.4 |  |  | $ | 261.2 |
Fair Value of Plan Assets | — |  |  | 332.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 227.5 |
Underfunded Projected Benefit Obligation as of December 31, 2023 | $ | (60.7) |  |  | $ | (10.4) |  |  | $ | (0.4) |  |  | $ | (1.2) |  |  | $ | (0.3) |  |  | $ | (1.4) |  |  | $ | (33.7) |
Underfunded Accumulated Benefit Obligation |
| AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
| (in millions)
Accumulated Benefit Obligation | $ | 46.9 |  |  | $ | 302.7 |  |  | $ | 0.2 |  |  | $ | 0.9 |  |  | $ | 0.1 |  |  | $ | 1.1 |  |  | $ | 210.5 |
Fair Value of Plan Assets | — |  |  | 288.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 188.9 |
Underfunded Accumulated Benefit Obligation as of December 31, 2024 | $ | (46.9) |  |  | $ | (14.7) |  |  | $ | (0.2) |  |  | $ | (0.9) |  |  | $ | (0.1) |  |  | $ | (1.1) |  |  | $ | (21.6) |
| AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
| (in millions)
Accumulated Benefit Obligation | $ | 54.8 |  |  | $ | 2.1 |  |  | $ | 0.1 |  |  | $ | 0.7 |  |  | $ | 0.1 |  |  | $ | 1.2 |  |  | $ | 242.9 |
Fair Value of Plan Assets | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 227.5 |
Underfunded Accumulated Benefit Obligation as of December 31, 2023 | $ | (54.8) |  |  | $ | (2.1) |  |  | $ | (0.1) |  |  | $ | (0.7) |  |  | $ | (0.1) |  |  | $ | (1.2) |  |  | $ | (15.4) |
Estimated Contributions and Payments to the Pension and OPEB Plans | The following table provides the estimated contributions and payments by Registrant for 2025:
|  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Pension Plans |  | $ | 101.2 |  |  | $ | 11.8 |  |  | $ | 0.5 |  |  | $ | 2.6 |  |  | $ | — |  |  | $ | 2.0 |  |  | $ | 8.8 |
OPEB |  | 2.7 |  |  | — |  |  | 1.4 |  |  | — |  |  | — |  |  | — |  |  | — |
Estimated Payments Expected to be Made by the Pension and OPEB Plans | The estimated payments for the pension benefits and OPEB are as follows:
Pension Plans |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2025 |  | $ | 341.5 |  |  | $ | 32.2 |  |  | $ | 42.3 |  |  | $ | 40.1 |  |  | $ | 31.6 |  |  | $ | 17.3 |  |  | $ | 20.7 |
2026 |  | 340.4 |  |  | 31.0 |  |  | 42.1 |  |  | 40.1 |  |  | 31.0 |  |  | 17.1 |  |  | 19.2 |
2027 |  | 334.8 |  |  | 28.8 |  |  | 40.0 |  |  | 39.0 |  |  | 30.8 |  |  | 17.1 |  |  | 20.4 |
2028 |  | 335.7 |  |  | 29.5 |  |  | 40.2 |  |  | 38.8 |  |  | 30.0 |  |  | 16.9 |  |  | 19.4 |
2029 |  | 322.7 |  |  | 27.8 |  |  | 38.6 |  |  | 37.1 |  |  | 29.5 |  |  | 15.1 |  |  | 19.0 |
Years 2030 to 2034, in Total |  | 1,530.3 |  |  | 120.9 |  |  | 181.6 |  |  | 179.0 |  |  | 137.8 |  |  | 73.3 |  |  | 88.4 |
OPEB Benefit Payments |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2025 |  | $ | 117.6 |  |  | $ | 9.5 |  |  | $ | 18.8 |  |  | $ | 14.5 |  |  | $ | 12.0 |  |  | $ | 6.6 |  |  | $ | 8.6 |
2026 |  | 116.4 |  |  | 9.7 |  |  | 18.4 |  |  | 14.5 |  |  | 11.7 |  |  | 6.6 |  |  | 8.3 |
2027 |  | 114.6 |  |  | 9.7 |  |  | 18.1 |  |  | 14.2 |  |  | 11.5 |  |  | 6.3 |  |  | 8.0 |
2028 |  | 112.4 |  |  | 9.3 |  |  | 17.9 |  |  | 13.9 |  |  | 11.4 |  |  | 6.0 |  |  | 8.0 |
2029 |  | 109.7 |  |  | 8.9 |  |  | 17.4 |  |  | 13.6 |  |  | 11.0 |  |  | 5.9 |  |  | 7.8 |
Years 2030 to 2034, in Total |  | 504.7 |  |  | 39.7 |  |  | 78.1 |  |  | 61.0 |  |  | 50.6 |  |  | 27.2 |  |  | 35.7 |
OPEB Medicare Subsidy Receipts |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2025 |  | $ | 0.2 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2026 |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
2027 |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
2028 |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
2029 |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Years 2030 to 2034, in Total |  | 1.4 |  |  | — |  |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | — |
Components of Net Periodic Benefit Cost | The following tables provide the components of net periodic benefit cost (credit) by Registrant for the plans: Pension Plans
2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 100.6 |  |  | $ | 8.9 |  |  | $ | 9.5 |  |  | $ | 13.0 |  |  | $ | 9.2 |  |  | $ | 5.9 |  |  | $ | 7.8 |
Interest Cost |  | 207.4 |  |  | 17.3 |  |  | 24.7 |  |  | 23.9 |  |  | 18.8 |  |  | 10.1 |  |  | 12.5 |
Expected Return on Plan Assets |  | (319.8) |  |  | (25.7) |  |  | (42.6) |  |  | (42.9) |  |  | (32.6) |  |  | (17.3) |  |  | (17.4) |
Amortization of Net Actuarial Loss |  | 4.5 |  |  | 0.3 |  |  | 0.4 |  |  | 0.4 |  |  | 0.3 |  |  | 0.2 |  |  | 0.1 |
Settlements (a) |  | 93.4 |  |  | 9.8 |  |  | 11.8 |  |  | 9.3 |  |  | 6.5 |  |  | 5.2 |  |  | 9.3 |
Net Periodic Benefit Cost |  | 86.1 |  |  | 10.6 |  |  | 3.8 |  |  | 3.7 |  |  | 2.2 |  |  | 4.1 |  |  | 12.3 |
Capitalized Portion |  | (46.6) |  |  | (5.3) |  |  | (4.4) |  |  | (3.9) |  |  | (5.5) |  |  | (2.8) |  |  | (3.1) |
Net Periodic Benefit Cost (Credit) Recognized in Expense |  | $ | 39.5 |  |  | $ | 5.3 |  |  | $ | (0.6) |  |  | $ | (0.2) |  |  | $ | (3.3) |  |  | $ | 1.3 |  |  | $ | 9.2 |
(a)AEP will seek recovery for the portion of pension settlement costs related to regulated operations. These costs were deferred as a regulatory asset for AEP, AEP Texas, APCo and PSO in the fourth quarter of 2024.
2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 94.3 |  |  | $ | 8.2 |  |  | $ | 9.1 |  |  | $ | 11.9 |  |  | $ | 8.4 |  |  | $ | 5.5 |  |  | $ | 7.7 |
Interest Cost |  | 219.2 |  |  | 18.3 |  |  | 26.4 |  |  | 24.9 |  |  | 19.8 |  |  | 10.7 |  |  | 13.9 |
Expected Return on Plan Assets |  | (339.2) |  |  | (28.1) |  |  | (44.6) |  |  | (44.2) |  |  | (34.0) |  |  | (18.3) |  |  | (19.4) |
Amortization of Net Actuarial Loss |  | 1.4 |  |  | 0.1 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Net Periodic Benefit Cost (Credit) |  | (24.3) |  |  | (1.5) |  |  | (9.1) |  |  | (7.3) |  |  | (5.8) |  |  | (2.1) |  |  | 2.3 |
Capitalized Portion |  | (43.6) |  |  | (4.7) |  |  | (4.2) |  |  | (3.6) |  |  | (4.7) |  |  | (2.5) |  |  | (3.0) |
Net Periodic Benefit Credit Recognized in Expense |  | $ | (67.9) |  |  | $ | (6.2) |  |  | $ | (13.3) |  |  | $ | (10.9) |  |  | $ | (10.5) |  |  | $ | (4.6) |  |  | $ | (0.7) |
2022 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 123.1 |  |  | $ | 11.1 |  |  | $ | 11.4 |  |  | $ | 16.2 |  |  | $ | 11.2 |  |  | $ | 7.4 |  |  | $ | 10.6 |
Interest Cost |  | 148.2 |  |  | 12.1 |  |  | 17.5 |  |  | 17.0 |  |  | 13.3 |  |  | 7.0 |  |  | 9.1 |
Expected Return on Plan Assets |  | (253.4) |  |  | (21.0) |  |  | (32.3) |  |  | (32.4) |  |  | (24.8) |  |  | (13.4) |  |  | (14.6) |
Amortization of Net Actuarial Loss |  | 63.0 |  |  | 5.2 |  |  | 7.4 |  |  | 7.1 |  |  | 5.5 |  |  | 2.9 |  |  | 3.8 |
Net Periodic Benefit Cost |  | 80.9 |  |  | 7.4 |  |  | 4.0 |  |  | 7.9 |  |  | 5.2 |  |  | 3.9 |  |  | 8.9 |
Capitalized Portion |  | (53.8) |  |  | (6.2) |  |  | (5.0) |  |  | (4.6) |  |  | (6.1) |  |  | (3.2) |  |  | (4.0) |
Net Periodic Benefit Cost (Credit) Recognized in Expense |  | $ | 27.1 |  |  | $ | 1.2 |  |  | $ | (1.0) |  |  | $ | 3.3 |  |  | $ | (0.9) |  |  | $ | 0.7 |  |  | $ | 4.9 |
OPEB
2024 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 4.5 |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest Cost |  | 42.0 |  |  | 3.3 |  |  | 6.6 |  |  | 4.8 |  |  | 4.2 |  |  | 2.1 |  |  | 2.7 |
Expected Return on Plan Assets |  | (111.3) |  |  | (9.1) |  |  | (16.3) |  |  | (13.5) |  |  | (11.8) |  |  | (6.0) |  |  | (7.5) |
Amortization of Prior Service Credit |  | (12.7) |  |  | (1.0) |  |  | (1.9) |  |  | (1.7) |  |  | (1.3) |  |  | (0.7) |  |  | (1.1) |
Amortization of Net Actuarial Loss |  | 3.0 |  |  | 0.2 |  |  | 0.4 |  |  | 0.5 |  |  | 0.4 |  |  | 0.2 |  |  | 0.3 |
Special/Contractual Termination Benefits |  | 3.5 |  |  | 0.3 |  |  | 0.6 |  |  | 0.3 |  |  | 0.2 |  |  | 0.2 |  |  | 0.3 |
Net Periodic Benefit Credit |  | (71.0) |  |  | (6.0) |  |  | (10.1) |  |  | (9.0) |  |  | (7.9) |  |  | (3.9) |  |  | (4.9) |
Capitalized Portion |  | (2.1) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.1) |  |  | (0.2) |
Net Periodic Benefit Credit Recognized in Expense |  | $ | (73.1) |  |  | $ | (6.2) |  |  | $ | (10.3) |  |  | $ | (9.2) |  |  | $ | (8.1) |  |  | $ | (4.0) |  |  | $ | (5.1) |
2023 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 4.6 |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest Cost |  | 46.2 |  |  | 3.6 |  |  | 7.4 |  |  | 5.4 |  |  | 4.7 |  |  | 2.4 |  |  | 2.9 |
Expected Return on Plan Assets |  | (109.6) |  |  | (9.0) |  |  | (16.1) |  |  | (13.5) |  |  | (11.8) |  |  | (5.9) |  |  | (7.2) |
Amortization of Prior Service Credit |  | (63.1) |  |  | (5.3) |  |  | (9.2) |  |  | (8.7) |  |  | (6.3) |  |  | (4.0) |  |  | (4.9) |
Amortization of Net Actuarial Loss |  | 14.8 |  |  | 1.2 |  |  | 2.3 |  |  | 1.9 |  |  | 1.6 |  |  | 0.8 |  |  | 1.0 |
Net Periodic Benefit Credit |  | (107.1) |  |  | (9.2) |  |  | (15.1) |  |  | (14.3) |  |  | (11.4) |  |  | (6.4) |  |  | (7.8) |
Capitalized Portion |  | (2.1) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.1) |  |  | (0.2) |
Net Periodic Benefit Credit Recognized in Expense |  | $ | (109.2) |  |  | $ | (9.4) |  |  | $ | (15.3) |  |  | $ | (14.5) |  |  | $ | (11.6) |  |  | $ | (6.5) |  |  | $ | (8.0) |
2022 |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Service Cost |  | $ | 7.4 |  |  | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 0.6 |
Interest Cost |  | 29.2 |  |  | 2.2 |  |  | 4.7 |  |  | 3.4 |  |  | 3.0 |  |  | 1.5 |  |  | 1.8 |
Expected Return on Plan Assets |  | (110.0) |  |  | (9.1) |  |  | (16.3) |  |  | (13.7) |  |  | (12.0) |  |  | (6.1) |  |  | (7.3) |
Amortization of Prior Service Credit |  | (71.4) |  |  | (6.1) |  |  | (10.4) |  |  | (9.7) |  |  | (7.1) |  |  | (4.4) |  |  | (5.3) |
Net Periodic Benefit Credit |  | (144.8) |  |  | (12.5) |  |  | (21.2) |  |  | (19.1) |  |  | (15.5) |  |  | (8.6) |  |  | (10.2) |
Capitalized Portion |  | (3.2) |  |  | (0.3) |  |  | (0.4) |  |  | (0.3) |  |  | (0.3) |  |  | (0.2) |  |  | (0.2) |
Net Periodic Benefit Credit Recognized in Expense |  | $ | (148.0) |  |  | $ | (12.8) |  |  | $ | (21.6) |  |  | $ | (19.4) |  |  | $ | (15.8) |  |  | $ | (8.8) |  |  | $ | (10.4) |
Cost for Matching Contributions to the Retirement Savings Plans | The following table provides the cost for matching contributions to the retirement savings plans by Registrant:
Year Ended December 31, |  | AEP |  | AEP Texas |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2024 |  | $ | 81.5 |  |  | $ | 6.8 |  |  | $ | 8.0 |  |  | $ | 10.7 |  |  | $ | 7.9 |  |  | $ | 5.3 |  |  | $ | 6.5 |
2023 |  | 87.9 |  |  | 7.1 |  |  | 8.4 |  |  | 11.0 |  |  | 8.2 |  |  | 5.3 |  |  | 6.7 |
2022 |  | 81.9 |  |  | 6.5 |  |  | 7.8 |  |  | 11.1 |  |  | 7.7 |  |  | 4.7 |  |  | 6.4 |

X
- Definition Tabular disclosure of the percentage of investments that are allocated to the Registrant Subsidiaries. + References No definition available. + Details
Name: | aep_AllocatedAssetsofInvestmentsTableTextBlock
Namespace Prefix: | aep_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the expected contributions and payments expected to be paid to the pension plans and/or other employee benefit plans in the next fiscal year. + References No definition available. + Details
Name: | aep_ScheduleOfEstimatedContributionsAndPaymentsToPensionAndOPEBPlansTableTextBlock
Namespace Prefix: | aep_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a)(b)(c) -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (e) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefit obligation and plan assets of defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
Name: | us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
Name: | us-gaap_ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (l) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration