Separate Account Liabilities Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Separate Account, Liability [Line Items]
Separate account liabilities	$ 141,003	$ 144,634
Latin America | Pension Plan
Separate Account, Liability [Line Items]
Separate account liabilities	38,512	41,320	$ 42,211	$ 39,428
Stable Value and Risk Solutions | RIS
Separate Account, Liability [Line Items]
Separate account liabilities	39,451	41,343	45,687	48,265
Annuities | RIS
Separate Account, Liability [Line Items]
Separate account liabilities	11,465	11,659	12,219	11,694
Annuities | MetLife Holdings
Separate Account, Liability [Line Items]
Separate account liabilities	29,866	29,224	$ 29,320	$ 28,499
Insurance, Other
Separate Account, Liability [Line Items]
Separate account liabilities	$ 21,709	$ 21,088