Future Policy Benefits - FPB on Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Net liability for FPBs	$ 197,667	$ 193,646
Fixed & Immediate Annuities | RIS
Net liability for FPBs	68,146	66,262	$ 62,362
Whole and Term Life & Endowments | Asia
Net liability for FPBs	11,565	11,167	11,861
Accident & health insurance | Asia
Net liability for FPBs	9,679	9,406	9,859
Fixed Annuity | Latin America
Net liability for FPBs	10,388	9,600	8,771
Long-term Care | MetLife Holdings
Net liability for FPBs	14,716	14,537	$ 14,845
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Net liability for FPBs	3,804	3,780
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Net liability for FPBs	798	759
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Net liability for FPBs	903	849
Fixed Annuity for Deferred Profit Liabilities | Latin America
Net liability for FPBs	521	498
Variable Life | Asia
Net liability for FPBs	1,157	1,108
Universal and Variable Universal Life | Asia
Net liability for FPBs	372	355
Universal and Variable Universal Life | MetLife Holdings
Net liability for FPBs	2,528	2,496
Participating Life Insurance Contract | MetLife Holdings
Net liability for FPBs	48,120	48,485
Long-Duration Insurance, Other
Net liability for FPBs	10,757	10,712
Short-Duration Insurance, Other
Net liability for FPBs	$ 14,213	$ 13,632