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Separate Account Liabilities Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | $ 144,634 | $ 146,038 |  |
Retirement and Income Solutions |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 53,093 | 60,040 |  |
Latin America |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 41,320 | 39,428 |  |
Latin America | Pension Plan |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 41,320 | 39,428 | $ 37,631 | $ 50,075
MetLife Holdings |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 35,548 | 33,974 |  |
Stable Value and Risk Solutions | Retirement and Income Solutions |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 41,343 | 48,265 | 58,473 | 62,150
Annuities | Retirement and Income Solutions |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 11,659 | 11,694 | 21,292 | 21,895
Annuities | MetLife Holdings |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | 29,224 | 28,499 | $ 40,173 | $ 40,825
Insurance, Other |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Separate account liabilities | $ 21,088 | $ 18,152 |  |

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