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Policyholder Account Balances - Amounts on Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | $ 221,445 | $ 219,269 |  |  |
Other Products |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 16,566 | 17,226 |  |  |
Group Life - Term | Group Benefits |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 7,632 | 7,692 | $ 8,028 | $ 7,893 |
Capital Markets Investment Products and Stable Value GICs | RIS |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 63,715 | 64,140 | 63,723 | 62,521 |
Annuities and Risk Solutions | RIS |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 20,699 | 17,711 | 15,549 | 14,431 | $ 144
Universal and Variable Universal Life | Asia |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 50,801 | 49,739 | 46,417 | 46,590 |
Fixed Annuity | Asia |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 38,421 | 36,863 | 32,454 | 30,976 |
Fixed Annuity | MetLife Holdings |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 10,142 | 11,537 | 13,286 | 14,398 |
Variable Annuity | EMEA |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | 2,337 | 2,720 | 2,802 | 4,215 |
Life and Other | MetLife Holdings |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |
Policyholder account balance | $ 11,132 | $ 11,641 | $ 12,402 | $ 12,699 |

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