Future Policy Benefits - FPB on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Net liability for FPBs	$ 198,965	$ 193,646
Fixed & Immediate Annuities | RIS
Net liability for FPBs	68,193	66,262	$ 64,338
Whole and Term Life & Endowments | Asia
Net liability for FPBs	11,844	11,167	11,260
Accident & health insurance | Asia
Net liability for FPBs	9,395	9,406	9,189
Fixed Annuity | Latin America
Net liability for FPBs	10,964	9,600	9,020
Long-term Care | MetLife Holdings
Net liability for FPBs	14,803	14,537	$ 14,455
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Net liability for FPBs	3,812	3,780
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Net liability for FPBs	899	759
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Net liability for FPBs	981	849
Fixed Annuity for Deferred Profit Liabilities | Latin America
Net liability for FPBs	531	498
Variable Life | Asia
Net liability for FPBs	1,188	1,108
Universal and Variable Universal Life | Asia
Net liability for FPBs	386	355
Universal and Variable Universal Life | MetLife Holdings
Net liability for FPBs	2,567	2,496
Participating Life Insurance Contract | MetLife Holdings
Net liability for FPBs	47,872	48,485
Long-Duration Insurance, Other
Net liability for FPBs	11,012	10,712
Short-Duration Insurance, Other
Net liability for FPBs	$ 14,518	$ 13,632