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EMPLOYEE BENEFITS - Schedule of Net Periodic (Income) Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 3 | $ 4 | $ 3
Interest cost | 50 | 51 | 37
Expected return on plan assets | (97) | (92) | (93)
Amortization of actuarial loss | 14 | 17 | 14
Settlement | 3 | 0 | 0
Net periodic pension cost (income) | (27) | (20) | (39)
Net actuarial loss (gain) | (26) | (43) | 52
Amortization of actuarial loss | (14) | (17) | (14)
Settlement | (3) | 0 | 0
Total recognized in OCI | (43) | (60) | 38
Total recognized in net periodic benefit cost (income) and OCI | $ (70) | $ (80) | $ (1)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Noninterest Expense | Other Noninterest Expense | Other Noninterest Expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other operating expense | Other operating expense | Other operating expense
Qualified Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 3 | $ 4 | $ 3
Interest cost | 45 | 46 | 34
Expected return on plan assets | (97) | (92) | (93)
Amortization of actuarial loss | 13 | 15 | 11
Settlement | 0 | 0 | 0
Net periodic pension cost (income) | (36) | (27) | (45)
Net actuarial loss (gain) | (23) | (44) | 71
Amortization of actuarial loss | (13) | (15) | (11)
Settlement | 0 | 0 | 0
Total recognized in OCI | (36) | (59) | 60
Total recognized in net periodic benefit cost (income) and OCI | (72) | (86) | 15
Non-Qualified Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 0 | 0 | 0
Interest cost | 5 | 5 | 3
Expected return on plan assets | 0 | 0 | 0
Amortization of actuarial loss | 1 | 2 | 3
Settlement | 3 | 0 | 0
Net periodic pension cost (income) | 9 | 7 | 6
Net actuarial loss (gain) | (3) | 1 | (19)
Amortization of actuarial loss | (1) | (2) | (3)
Settlement | (3) | 0 | 0
Total recognized in OCI | (7) | (1) | (22)
Total recognized in net periodic benefit cost (income) and OCI | $ 2 | $ 6 | $ (16)

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