Separate Account Liabilities Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Separate Account, Liability [Line Items]
Separate account liabilities	$ 144,634	$ 146,038
Retirement and Income Solutions
Separate Account, Liability [Line Items]
Separate account liabilities	53,093	60,040
Latin America
Separate Account, Liability [Line Items]
Separate account liabilities	41,320	39,428
Latin America | Pension Plan
Separate Account, Liability [Line Items]
Separate account liabilities	41,320	39,428	$ 37,631	$ 50,075
MetLife Holdings
Separate Account, Liability [Line Items]
Separate account liabilities	35,548	33,974
Stable Value and Risk Solutions | Retirement and Income Solutions
Separate Account, Liability [Line Items]
Separate account liabilities	41,343	48,265	58,473	62,150
Annuities | Retirement and Income Solutions
Separate Account, Liability [Line Items]
Separate account liabilities	11,659	11,694	21,292	21,895
Annuities | MetLife Holdings
Separate Account, Liability [Line Items]
Separate account liabilities	29,224	28,499	$ 40,173	$ 40,825
Insurance, Other
Separate Account, Liability [Line Items]
Separate account liabilities	$ 21,088	$ 18,152