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Equity - Statutory Equity & Income Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Principal U.S. Insurance Subsidiaries, Excluding American Life |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Combined RBC ratio of the principal U.S. insurance subsidiaries | in excess of 380% | in excess of 340% |
Metropolitan Life Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory capital and surplus | $ 11,593 | $ 10,869 |
Prescribed practice, amount | 1,400 | 1,300 |
Statutory net income (loss) | 3,407 | 2,737 | $ 3,513
MetLife Reinsurance Company of Vermont |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Prescribed practice, amount | 2,000 | 2,000 |
MetLife's Domestic Captive Life Reinsurance Subsidiaries |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory capital and surplus | 723 | 726 |
Statutory net income (loss) | $ 63 | $ 44 | $ 41
Japan |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Adjusted capital | in excess of three times the 200% solvency margin ratio | in excess of three times the 200% solvency margin ratio |
Other Foreign Operations, Excluding Japan |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory capital and surplus required | $ 3,100 |  |
Statutory capital and surplus | $ 7,400 |  |

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