| 15. 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
June 30, | | | 2026 | | 2025 | | | Pension
Benefits | | Other
Postretirement
Benefits | | Pension
Benefits | | Other
Postretirement
Benefits | | | (In millions) | Service costs | | $ | 38 | | | $ | 2 | | | $ | 38 | | | $ | 1 | | Interest costs | | 119 | | | 12 | | | 119 | | | 10 | | Expected return on plan assets | | (112) | | | (8) | | | (111) | | | (7) | | Amortization of net actuarial (gains) losses | | 39 | | | (11) | | | 42 | | | (15) | | Amortization of prior service costs (credit) | | (2) | | | — | | | (3) | | | — | | Net periodic benefit costs (credit) | | $ | 82 | | | $ | (5) | | | $ | 85 | | | $ | (11) | | | | | | | | | | | | | Six Months
Ended
June 30, | | | 2026 | | 2025 | | | Pension
Benefits | | Other
Postretirement
Benefits | | Pension
Benefits | | Other
Postretirement
Benefits | | | (In millions) | Service costs | | $ | 75 | | | $ | 2 | | | $ | 75 | | | $ | 2 | | Interest costs | | 237 | | | 23 | | | 238 | | | 21 | | Expected return on plan assets | | (225) | | | (15) | | | (221) | | | (21) | | Amortization of net actuarial (gains) losses | | 77 | | | (22) | | | 84 | | | (23) | | Amortization of prior service costs (credit) | | (4) | | | (1) | | | (6) | | | — | | Net periodic benefit costs (credit) | | $ | 160 | | | $ | (13) | | | $ | 170 | | | $ | (21) | |
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