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Derivatives (Embedded Derivatives) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract] |  |
Total | $ 93 | $ 17
Funds withheld on ceded reinsurance | Other liabilities |  |
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract] |  |
Total | (70) | (123)
Fixed annuities with equity indexed returns [Member] | Policyholder account balances [Member] |  |
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract] |  |
Total | $ 163 | $ 140

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
Name: | us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_GuaranteedInsuranceContractTypeOfGuaranteeAxis=met_FundsWithheldOnCededReinsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_GuaranteedInsuranceContractTypeOfGuaranteeAxis=met_FixedannuitieswithequityindexedreturnsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=met_PolicyholderAccountBalancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |