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BENEFIT PLANS - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 100.6 | $ 94.3 | $ 123.1
Interest Cost | 207.4 | 219.2 | 148.2
Expected Return on Plan Assets | (319.8) | (339.2) | (253.4)
Amortization of Net Actuarial Loss | 4.5 | 1.4 | 63.0
Settlements | 93.4 |  |
Net Periodic Benefit Cost (Credit) | 86.1 | (24.3) | 80.9
Capitalized Portion | (46.6) | (43.6) | (53.8)
Net Periodic Benefit Cost (Credit) Recognized in Expense | 39.5 | (67.9) | 27.1
Pension Plans | AEP TEXAS INC. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 8.9 | 8.2 | 11.1
Interest Cost | 17.3 | 18.3 | 12.1
Expected Return on Plan Assets | (25.7) | (28.1) | (21.0)
Amortization of Net Actuarial Loss | 0.3 | 0.1 | 5.2
Settlements | 9.8 |  |
Net Periodic Benefit Cost (Credit) | 10.6 | (1.5) | 7.4
Capitalized Portion | (5.3) | (4.7) | (6.2)
Net Periodic Benefit Cost (Credit) Recognized in Expense | 5.3 | (6.2) | 1.2
Pension Plans | APPALACHIAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 9.5 | 9.1 | 11.4
Interest Cost | 24.7 | 26.4 | 17.5
Expected Return on Plan Assets | (42.6) | (44.6) | (32.3)
Amortization of Net Actuarial Loss | 0.4 | 0.0 | 7.4
Settlements | 11.8 |  |
Net Periodic Benefit Cost (Credit) | 3.8 | (9.1) | 4.0
Capitalized Portion | (4.4) | (4.2) | (5.0)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (0.6) | (13.3) | (1.0)
Pension Plans | INDIANA MICHIGAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 13.0 | 11.9 | 16.2
Interest Cost | 23.9 | 24.9 | 17.0
Expected Return on Plan Assets | (42.9) | (44.2) | (32.4)
Amortization of Net Actuarial Loss | 0.4 | 0.1 | 7.1
Settlements | 9.3 |  |
Net Periodic Benefit Cost (Credit) | 3.7 | (7.3) | 7.9
Capitalized Portion | (3.9) | (3.6) | (4.6)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (0.2) | (10.9) | 3.3
Pension Plans | OHIO POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 9.2 | 8.4 | 11.2
Interest Cost | 18.8 | 19.8 | 13.3
Expected Return on Plan Assets | (32.6) | (34.0) | (24.8)
Amortization of Net Actuarial Loss | 0.3 | 0.0 | 5.5
Settlements | 6.5 |  |
Net Periodic Benefit Cost (Credit) | 2.2 | (5.8) | 5.2
Capitalized Portion | (5.5) | (4.7) | (6.1)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (3.3) | (10.5) | (0.9)
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 5.9 | 5.5 | 7.4
Interest Cost | 10.1 | 10.7 | 7.0
Expected Return on Plan Assets | (17.3) | (18.3) | (13.4)
Amortization of Net Actuarial Loss | 0.2 | 0.0 | 2.9
Settlements | 5.2 |  |
Net Periodic Benefit Cost (Credit) | 4.1 | (2.1) | 3.9
Capitalized Portion | (2.8) | (2.5) | (3.2)
Net Periodic Benefit Cost (Credit) Recognized in Expense | 1.3 | (4.6) | 0.7
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 7.8 | 7.7 | 10.6
Interest Cost | 12.5 | 13.9 | 9.1
Expected Return on Plan Assets | (17.4) | (19.4) | (14.6)
Amortization of Net Actuarial Loss | 0.1 | 0.1 | 3.8
Settlements | 9.3 |  |
Net Periodic Benefit Cost (Credit) | 12.3 | 2.3 | 8.9
Capitalized Portion | (3.1) | (3.0) | (4.0)
Net Periodic Benefit Cost (Credit) Recognized in Expense | 9.2 | (0.7) | 4.9
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 4.5 | 4.6 | 7.4
Interest Cost | 42.0 | 46.2 | 29.2
Expected Return on Plan Assets | (111.3) | (109.6) | (110.0)
Amortization of Prior Service Credit | (12.7) | (63.1) | (71.4)
Amortization of Net Actuarial Loss | 3.0 | 14.8 |
Special/Contractual Termination Benefits | 3.5 |  |
Net Periodic Benefit Cost (Credit) | (71.0) | (107.1) | (144.8)
Capitalized Portion | (2.1) | (2.1) | (3.2)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (73.1) | (109.2) | (148.0)
OPEB | AEP TEXAS INC. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.3 | 0.3 | 0.5
Interest Cost | 3.3 | 3.6 | 2.2
Expected Return on Plan Assets | (9.1) | (9.0) | (9.1)
Amortization of Prior Service Credit | (1.0) | (5.3) | (6.1)
Amortization of Net Actuarial Loss | 0.2 | 1.2 |
Special/Contractual Termination Benefits | 0.3 |  |
Net Periodic Benefit Cost (Credit) | (6.0) | (9.2) | (12.5)
Capitalized Portion | (0.2) | (0.2) | (0.3)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (6.2) | (9.4) | (12.8)
OPEB | APPALACHIAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.5 | 0.5 | 0.8
Interest Cost | 6.6 | 7.4 | 4.7
Expected Return on Plan Assets | (16.3) | (16.1) | (16.3)
Amortization of Prior Service Credit | (1.9) | (9.2) | (10.4)
Amortization of Net Actuarial Loss | 0.4 | 2.3 |
Special/Contractual Termination Benefits | 0.6 |  |
Net Periodic Benefit Cost (Credit) | (10.1) | (15.1) | (21.2)
Capitalized Portion | (0.2) | (0.2) | (0.4)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (10.3) | (15.3) | (21.6)
OPEB | INDIANA MICHIGAN POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.6 | 0.6 | 0.9
Interest Cost | 4.8 | 5.4 | 3.4
Expected Return on Plan Assets | (13.5) | (13.5) | (13.7)
Amortization of Prior Service Credit | (1.7) | (8.7) | (9.7)
Amortization of Net Actuarial Loss | 0.5 | 1.9 |
Special/Contractual Termination Benefits | 0.3 |  |
Net Periodic Benefit Cost (Credit) | (9.0) | (14.3) | (19.1)
Capitalized Portion | (0.2) | (0.2) | (0.3)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (9.2) | (14.5) | (19.4)
OPEB | OHIO POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.4 | 0.4 | 0.6
Interest Cost | 4.2 | 4.7 | 3.0
Expected Return on Plan Assets | (11.8) | (11.8) | (12.0)
Amortization of Prior Service Credit | (1.3) | (6.3) | (7.1)
Amortization of Net Actuarial Loss | 0.4 | 1.6 |
Special/Contractual Termination Benefits | 0.2 |  |
Net Periodic Benefit Cost (Credit) | (7.9) | (11.4) | (15.5)
Capitalized Portion | (0.2) | (0.2) | (0.3)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (8.1) | (11.6) | (15.8)
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.3 | 0.3 | 0.4
Interest Cost | 2.1 | 2.4 | 1.5
Expected Return on Plan Assets | (6.0) | (5.9) | (6.1)
Amortization of Prior Service Credit | (0.7) | (4.0) | (4.4)
Amortization of Net Actuarial Loss | 0.2 | 0.8 |
Special/Contractual Termination Benefits | 0.2 |  |
Net Periodic Benefit Cost (Credit) | (3.9) | (6.4) | (8.6)
Capitalized Portion | (0.1) | (0.1) | (0.2)
Net Periodic Benefit Cost (Credit) Recognized in Expense | (4.0) | (6.5) | (8.8)
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 0.4 | 0.4 | 0.6
Interest Cost | 2.7 | 2.9 | 1.8
Expected Return on Plan Assets | (7.5) | (7.2) | (7.3)
Amortization of Prior Service Credit | (1.1) | (4.9) | (5.3)
Amortization of Net Actuarial Loss | 0.3 | 1.0 |
Special/Contractual Termination Benefits | 0.3 |  |
Net Periodic Benefit Cost (Credit) | (4.9) | (7.8) | (10.2)
Capitalized Portion | (0.2) | (0.2) | (0.2)
Net Periodic Benefit Cost (Credit) Recognized in Expense | $ (5.1) | $ (8.0) | $ (10.4)

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