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Policyholder Account Balances - Amounts on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 235,312	$ 221,445
Other Products
Policyholder Account Balance [Line Items]
Policyholder account balance	19,041	16,566
Group Life | Group Benefits
Policyholder Account Balance [Line Items]
Policyholder account balance	7,557	7,632	$ 7,676	$ 7,692
Capital Markets Investment Products and Stable Value GICs | RIS
Policyholder Account Balance [Line Items]
Policyholder account balance	66,052	63,715	65,330	64,140
Annuities and Risk Solutions | RIS
Policyholder Account Balance [Line Items]
Policyholder account balance	22,824	20,699	19,572	17,711
Universal and Variable Universal Life | Asia
Policyholder Account Balance [Line Items]
Policyholder account balance	54,666	50,801	51,756	49,739
Fixed Annuity | Asia
Policyholder Account Balance [Line Items]
Policyholder account balance	42,708	38,421	38,742	36,863
Fixed Annuity | MetLife Holdings
Policyholder Account Balance [Line Items]
Policyholder account balance	9,451	10,142	10,437	11,537
Variable Annuity | EMEA
Policyholder Account Balance [Line Items]
Policyholder account balance	2,297	2,337	2,617	2,720
Life and Other | MetLife Holdings
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 10,716	$ 11,132	$ 11,284	$ 11,641

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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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