XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | $ 8,295 | $ 8,742
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 2,018 | 1,589
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 10,313 | 10,331
Unit-linked investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 7,398 | 7,770
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 1,469 | 1,112
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 8,867 | 8,882
FVO securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 897 | 972
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 549 | 477
Contractholder-directed equity securities and fair value option securities, at estimated fair value | $ 1,446 | $ 1,449

X
- Definition Equity and Trading Securities, FV-NI, Unrealized Gains (Losses) + References No definition available. + Details
Name: | met_EquityAndTradingSecuritiesFVNIUnrealizedGainsLosses
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cost of investment in debt investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_TradingSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=met_FairValueOptionContractholderDirectedUnitLinkedInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=met_FVOSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |