Future Policy Benefits - FPB on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net liability for FPBs	$ 193,646	$ 196,406
Fixed & Immediate Annuities | RIS
Net liability for FPBs	66,262	64,324	$ 58,495
Whole and Term Life & Endowments | Asia
Net liability for FPBs	11,167	12,874	12,792
Accident & health insurance | Asia
Net liability for FPBs	9,406	10,712	10,040
Fixed Annuity | Latin America
Net liability for FPBs	9,600	9,637	9,265
Long-term Care | MetLife Holdings
Net liability for FPBs	14,537	15,240	$ 13,845
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Net liability for FPBs	3,780	3,697
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Net liability for FPBs	759	654
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Net liability for FPBs	849	830
Fixed Annuity for Deferred Profit Liabilities | Latin America
Net liability for FPBs	498	562
Variable Life | Asia
Net liability for FPBs	1,108	1,258
Universal and Variable Universal Life | Asia
Net liability for FPBs	355	424
Universal and Variable Universal Life | MetLife Holdings
Net liability for FPBs	2,496	2,362
Participating Life Insurance Contract | MetLife Holdings
Net liability for FPBs	48,485	49,543
Long-Duration Insurance, Other
Net liability for FPBs	10,712	11,099
Short-Duration Insurance, Other
Net liability for FPBs	$ 13,632	$ 13,190