Future Policy Benefits - FPB on Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Net liability for FPBs	$ 191,013	$ 196,406
Fixed & Immediate Annuities | RIS
Net liability for FPBs	62,362	64,324	$ 59,595
Whole and Term Life & Endowments | Asia
Net liability for FPBs	11,861	12,874	13,498
Accident & health insurance | Asia
Net liability for FPBs	9,859	10,712	11,177
Fixed Annuity | Latin America
Net liability for FPBs	8,771	9,637	10,298
Long-term Care | MetLife Holdings
Net liability for FPBs	14,845	15,240	$ 14,617
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Net liability for FPBs	3,694	3,697
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Net liability for FPBs	667	654
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Net liability for FPBs	808	830
Fixed Annuity for Deferred Profit Liabilities | Latin America
Net liability for FPBs	504	562
Variable Life | Asia
Net liability for FPBs	1,153	1,258
Universal and Variable Universal Life | Asia
Net liability for FPBs	385	424
Universal and Variable Universal Life | MetLife Holdings
Net liability for FPBs	2,396	2,362
Participating Life Insurance Contract | MetLife Holdings
Net liability for FPBs	49,227	49,543
Long-Duration Insurance, Other
Net liability for FPBs	10,824	11,099
Short-Duration Insurance, Other
Net liability for FPBs	$ 13,657	$ 13,190