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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS Net periodic defined benefit cost (credit) is comprised of service cost and other components of net benefit cost (credit). Service cost is included in salaries and benefits expense and other components of net benefit cost (credit) are included in other noninterest expenses on the Consolidated Statements of Comprehensive Income. For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2024 Annual Report. The components of net periodic benefit cost (credit) for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.
Qualified Defined Benefit Pension Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 8 |  |  | $ | 9 |  |  | $ | 17 |  |  | $ | 17 |
Other components of net benefit credit: |  |  |  |  |  |  |
Interest cost | 22 |  |  | 21 |  |  | 43 |  |  | 42 |
Expected return on plan assets | (45) |  |  | (45) |  |  | (89) |  |  | (90) |
Amortization of prior service credit | (3) |  |  | (4) |  |  | (7) |  |  | (7) |
Amortization of net loss | 5 |  |  | 5 |  |  | 11 |  |  | 11 |
Total other components of net benefit credit | (21) |  |  | (23) |  |  | (42) |  |  | (44) |
Net periodic defined benefit credit | $ | (13) |  |  | $ | (14) |  |  | $ | (25) |  |  | $ | (27) |
Non-Qualified Defined Benefit Pension Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1 |
Other components of net benefit cost: |  |  |  |  |  |  |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Amortization of prior service credit | (1) |  |  | (1) |  |  | (2) |  |  | (3) |
Amortization of net loss | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Total other components of net benefit cost | 2 |  |  | 2 |  |  | 4 |  |  | 3 |
Net periodic defined benefit cost | $ | 3 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 4 |
Postretirement Benefit Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Other components of net benefit credit: |  |  |  |  |  |  |
Expected return on plan assets | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | (1) |
Net periodic defined benefit credit | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | (1) |

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