Separate Account Liabilities Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Separate Account, Liability [Line Items]
Separate account liabilities	$ 145,946	$ 146,038
Latin America | Pension Plan
Separate Account, Liability [Line Items]
Separate account liabilities	42,213	39,428	$ 34,396	$ 37,631
Stable Value and Risk Solutions | U.S.
Separate Account, Liability [Line Items]
Separate account liabilities	42,620	48,265	48,513	58,473
Investment Product | U.S.
Separate Account, Liability [Line Items]
Separate account liabilities	11,792	11,694	13,028	21,292
Investment Product | MetLife Holdings
Separate Account, Liability [Line Items]
Separate account liabilities	29,616	28,499	$ 30,163	$ 40,173
Insurance, Other
Separate Account, Liability [Line Items]
Separate account liabilities	$ 19,705	$ 18,152