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Junior Subordinated Debt Securities (Junior Subordinated Debt Securities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (108) | $ (87)
Junior Subordinated Notes | 3,161 | 3,158
MetLife Inc $500M Maturing 2069 [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | 500 | 500
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (5) | (5)
Debt Instrument, Interest Rate, Stated Percentage | 10.75% |
Debt Instrument, Interest Rate Terms | SOFR + 0.26161% + 7.548% |
Junior Subordinated Notes | $ 495 | 495
Senior notes |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (106) | (83)
Debt Instrument, Interest Rate, Stated Percentage | 5.70% |
MetLife Capital Trust X $750M Maturing 2068 [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | $ 750 | 750
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (8) | (9)
Debt Instrument, Interest Rate, Stated Percentage | 9.25% |
Debt Instrument, Interest Rate Terms | SOFR + 0.26161% + 5.540% |
Junior Subordinated Notes | $ 742 | 741
MetLife Capital Trust IV $700M Maturing 2067 [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | 700 | 700
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (12) | (13)
Debt Instrument, Interest Rate, Stated Percentage | 7.875% |
Debt Instrument, Interest Rate Terms | SOFR + 0.26161% + 3.960% |
Junior Subordinated Notes | $ 688 | 687
MetLife Inc $1,250M Maturing 2066 [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | 1,250 | 1,250
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (14) | (15)
Debt Instrument, Interest Rate, Stated Percentage | 6.40% |
Debt Instrument, Interest Rate Terms | SOFR + 0.26161% + 2.205% |
Junior Subordinated Notes | $ 1,236 | 1,235
Junior Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | 3,200 | 3,200
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (39) | $ (42)

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