Future Policy Benefits - FPB on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Net liability for FPBs	$ 190,993	$ 196,406
Fixed & Immediate Annuities | RIS
Net liability for FPBs	64,338	64,324	$ 60,281
Whole and Term Life & Endowments | Asia
Net liability for FPBs	11,260	12,874	12,499
Accident & health insurance | Asia
Net liability for FPBs	9,189	10,712	10,662
Fixed Annuity | Latin America
Net liability for FPBs	9,020	9,637	10,192
Long-term Care | MetLife Holdings
Net liability for FPBs	14,455	15,240	$ 14,498
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Net liability for FPBs	3,735	3,697
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Net liability for FPBs	690	654
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Net liability for FPBs	788	830
Fixed Annuity for Deferred Profit Liabilities | Latin America
Net liability for FPBs	522	562
Variable Life | Asia
Net liability for FPBs	1,074	1,258
Universal and Variable Universal Life | Asia
Net liability for FPBs	354	424
Universal and Variable Universal Life | MetLife Holdings
Net liability for FPBs	2,434	2,362
Participating Life Insurance Contract | MetLife Holdings
Net liability for FPBs	48,911	49,543
Long-Duration Insurance, Other
Net liability for FPBs	10,544	11,099
Short-Duration Insurance, Other
Net liability for FPBs	$ 13,679	$ 13,190