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Equity (Statutory Equity & Income - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 340% | in excess of 360% |
Metropolitan Life Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Prescribed Practice, Amount | $ 1,300 | $ 1,200 |
Statutory Accounting Practices, Statutory Net Income Amount | 2,737 | 3,513 | $ 3,392
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 10,869 | 11,804 |
MetLife Reinsurance Company of Vermont |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Prescribed Practice, Amount | 2,000 | 2,000 |
MetLife's Domestic Captive Life Reinsurance Subsidiaries |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Net Income Amount | 44 | 41 | $ (7)
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 726 | $ 693 |
Japan |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Adjusted capital | in excess of three times | in excess of four times the 200% solvency margin ratio |
Other Foreign Operations, Excluding Japan |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory capital and surplus required | $ 3,300 |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 7,400 |  |

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