XML 177 R141.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Investments (Other Invested Assets - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |
Carrying Value of Tax Equity Investments | $ 714 | $ 1,000
Income Tax Credits And Other Income Tax Benefits | 149 |
Tax Equity Investments Amortization Expense | $ 134 |

X
- Definition This caption discloses the carrying value amount of tax equity investments + References No definition available. + Details
Name: | met_CarryingValueOfTaxEquityInvestments
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Income Tax Credits And Other Income Tax Benefits + References No definition available. + Details
Name: | met_IncomeTaxCreditsAndOtherIncomeTaxBenefits
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Equity Investments Amortization Expense + References No definition available. + Details
Name: | met_TaxEquityInvestmentsAmortizationExpense
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration