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Insurance (Obligations Under Funding Agreements - Narrative) (Details) - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Insurance [Abstract] |  |  |
Funding agreements issued to certain SPEs | $ 48.5 | $ 40.8 | $ 40.4
Funding agreements repaid to certain SPEs | 47.4 | 41.2 | $ 36.7
Outstanding funding agreements to certain SPEs | $ 40.7 | $ 39.5 |

X
- Definition Amount of funding agreements issued during current year to certain special purpose entities that have issued debt securities for which payment of interest and principal is secured by such funding agreements. + References No definition available. + Details
Name: | met_FundingAgreementsIssuedToCertainSpecialPurposeEntities
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of funding agreements repaid during current year to certain SPEs that have issued debt securities for which payment of interest and principal is secured by such funding agreements. + References No definition available. + Details
Name: | met_FundingAgreementsRepaidToCertainSpecialPurposeEntities
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of funding agreements outstanding to certain SPEs that have issued debt securities for which payment of interest and principal is secured by such funding agreements. + References No definition available. + Details
Name: | met_OutstandingFundingAgreementsToCertainSpecialPurposeEntities
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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