Separate Account Liabilities Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Separate Account, Liability [Line Items]
Separate account liabilities	$ 148,417	$ 146,038
Latin America | Pension Plan
Separate Account, Liability [Line Items]
Separate account liabilities	42,211	39,428	$ 39,126	$ 37,631
Stable Value and Risk Solutions | U.S.
Separate Account, Liability [Line Items]
Separate account liabilities	45,687	48,265	54,119	58,473
Investment Product | U.S.
Separate Account, Liability [Line Items]
Separate account liabilities	12,219	11,694	14,905	21,292
Investment Product | MetLife Holdings
Separate Account, Liability [Line Items]
Separate account liabilities	29,320	28,499	$ 36,079	$ 40,173
Insurance, Other
Separate Account, Liability [Line Items]
Separate account liabilities	$ 18,980	$ 18,152