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Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Negative VOBA) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite Lived Intangible Liabilities |  |  |
Balance at January 1, | $ 473 | $ 557 | $ 738
Amortization of negative VOBA | (26) | (29) | (35)
Effect of foreign currency translation and other | (20) | (55) | (74)
Balance at December 31, | 427 | 473 | 557
Accumulated amortization | $ 3,398 | $ 3,372 | $ 3,343

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- Definition Finite Lived Intangible Liabilities [Abstract] + References No definition available. + Details
Name: | met_FiniteLivedIntangibleLiabilitiesAbstract
Namespace Prefix: | met_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Accumulated amount of amortization of liabilities, excluding financial liabilities, lacking physical substance with a finite life. + References No definition available. + Details
Name: | met_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of the increase (decrease) during the period in negative value of business acquired liabilities due to foreign currency translation. + References No definition available. + Details
Name: | met_FiniteLivedIntangibleLiabilitiesForeignCurrencyTranslation
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The carrying amount of the estimated fair value of the in-force contract obligations that exceeded the assumed in-force insurance policy liabilities as of the balance sheet date. + References No definition available. + Details
Name: | met_FiniteLivedIntangibleLiabilitiesNet
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Negative value of business acquired is amortized over the policy period reflecting the expected pattern of losses included in the liability. Such amortization is recorded in other expenses. + References No definition available. + Details
Name: | met_NegativeValueOfBusinessAcquiredAmortization
Namespace Prefix: | met_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration