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Policyholder Account Balances - Amounts on Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | $ 219,168 | $ 219,269 |  |
Other Products |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 17,187 | 17,226 |  |
Group Life - Term | Group Benefits |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 7,747 | 7,692 | $ 7,965 | $ 8,028
Capital Markets Investment Products and Stable Value GICs | RIS |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 64,269 | 64,140 | 63,284 | 63,723
Annuities and Risk Solutions | RIS |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 18,266 | 17,711 | 16,128 | 15,549
Universal and Variable Universal Life | Asia |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 49,484 | 49,739 | 46,770 | 46,417
Fixed Annuity | Asia |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 36,969 | 36,863 | 34,272 | 32,454
Fixed Annuity | MetLife Holdings |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 11,129 | 11,537 | 12,818 | 13,286
Variable Annuity | EMEA |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | 2,631 | 2,720 | 2,845 | 2,802
Life and Other | MetLife Holdings |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balance | $ 11,486 | $ 11,641 | $ 12,234 | $ 12,402

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