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Employee Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2024
Retirement Benefits [Abstract] |
Employee Benefit Plans | 16. Employee Benefit Plans Pension and Other Postretirement Benefit Plans Certain subsidiaries of MetLife, Inc. sponsor a U.S. qualified and various U.S. and non-U.S. nonqualified defined benefit pension plans covering employees who meet specified eligibility requirements. These subsidiaries also provide certain postemployment benefits and certain postretirement medical and life insurance benefits for U.S. and non-U.S. retired employees. The components of net periodic benefit costs, reported in other expenses, were as follows:
|  | Three Months Ended March 31,
|  | 2024 |  | 2023
|  | Pension Benefits |  | Other Postretirement Benefits |  | Pension Benefits |  | Other Postretirement Benefits
|  | (In millions)
Service costs |  | $ | 40 |  |  | $ | 1 |  |  | $ | 38 |  |  | $ | 1 |
Interest costs |  | 114 |  |  | 10 |  |  | 118 |  |  | 11 |
Expected return on plan assets |  | (115) |  |  | (14) |  |  | (120) |  |  | (13) |
Amortization of net actuarial (gains) losses |  | 42 |  |  | (8) |  |  | 39 |  |  | (8) |
Amortization of prior service costs (credit) |  | (3) |  |  | — |  |  | (3) |  |  | — |
Net periodic benefit costs (credit) |  | $ | 78 |  |  | $ | (11) |  |  | $ | 72 |  |  | $ | (9) |

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