Disposition of MetLife Seguros S.A. (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss)	$ 6,575	$ 5,418	$ 5,909
Disposal Group, Including Discontinued Operation, Assets	7,238	$ 7,418	$ 0
MetLife Seguros S.A
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss)	(205)
Disposal Group, Including Discontinued Operation, Assets	$ 201