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Junior Subordinated Debt Securities (Junior Subordinated Debt Securities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (87) | $ (82)
Junior Subordinated Notes | 3,158 | 3,156
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) | (6)
Debt Instrument, Interest Rate, Stated Percentage | 10.75% |
Debt Instrument, Interest Rate Terms | LIBOR + 7.548% |
Junior Subordinated Notes | $ 495 | 494
Senior notes |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (83) | (77)
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 | $ (9) | (9)
Debt Instrument, Interest Rate, Stated Percentage | 9.25% |
Debt Instrument, Interest Rate Terms | LIBOR + 5.540% |
Junior Subordinated Notes | $ 741 | 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 | $ (13) | (13)
Debt Instrument, Interest Rate, Stated Percentage | 7.875% |
Debt Instrument, Interest Rate Terms | LIBOR + 3.960% |
Junior Subordinated Notes | $ 687 | 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 | $ (15) | (16)
Debt Instrument, Interest Rate, Stated Percentage | 6.40% |
Debt Instrument, Interest Rate Terms | LIBOR + 2.205% |
Junior Subordinated Notes | $ 1,235 | 1,234
Junior Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Face Value | 3,200 | 3,200
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (42) | $ (44)

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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