Disposition of Joint-stock Company MetLife Insurance Company (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Business		$ 6,575	$ 5,418	$ 5,909
Disposal Group, Including Discontinued Operation, Assets	$ 7,418	$ 7,238	7,418	$ 0
Joint-stock Company MetLife Insurance Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Business	(133)
Disposal Group, Including Discontinued Operation, Assets	$ 382		$ 382