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Reinsurance (Details) - Chariot Reinsurance, Ltd $ in Millions	Jul. 01, 2025 USD ($)
Effects of Reinsurance [Line Items]
Reinsurance recoverable	$ 8,400
Funds withheld liability	8,900
Ceding commission	$ 560

X

- Definition

Reinsurance, Ceding Commission

+ References

No definition available.

+ Details

Name:	met_ReinsuranceCedingCommission
Namespace Prefix:	met_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reinsurance, Liability For Funds Withheld

+ References

No definition available.

+ Details

Name:	met_ReinsuranceLiabilityForFundsWithheld
Namespace Prefix:	met_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reinsurance Recoverable

+ References

No definition available.

+ Details

Name:	met_ReinsuranceRecoverable
Namespace Prefix:	met_
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_EffectsOfReinsuranceLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CounterpartyNameAxis=met_ChariotReinsuranceLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: