Policyholder Account Balances - Amounts on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 232,433	$ 221,445
Other Products
Policyholder Account Balance [Line Items]
Policyholder account balance	18,247	16,566
Group Life - Term | Group Benefits
Policyholder Account Balance [Line Items]
Policyholder account balance	7,605	7,632	$ 7,644	$ 7,692
Capital Markets Investment Products and Stable Value GICs | RIS
Policyholder Account Balance [Line Items]
Policyholder account balance	66,557	63,715	64,945	64,140
Annuities and Risk Solutions | RIS
Policyholder Account Balance [Line Items]
Policyholder account balance	22,191	20,699	18,797	17,711
Universal and Variable Universal Life | Asia
Policyholder Account Balance [Line Items]
Policyholder account balance	53,564	50,801	49,229	49,739
Fixed Annuity | Asia
Policyholder Account Balance [Line Items]
Policyholder account balance	41,419	38,421	37,629	36,863
Fixed Annuity | MetLife Holdings
Policyholder Account Balance [Line Items]
Policyholder account balance	9,625	10,142	10,747	11,537
Variable Annuity | EMEA
Policyholder Account Balance [Line Items]
Policyholder account balance	2,376	2,337	2,552	2,720
Life and Other | MetLife Holdings
Policyholder Account Balance [Line Items]
Policyholder account balance	$ 10,849	$ 11,132	$ 11,303	$ 11,641