Disposition - MetLife Seguros de Retiro S.A. (Details) - USD ($) $ in Millions	3 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
Net investment gains (losses)		1,529	(110)	444
Provision for income tax expense (benefit)		$ 1,551	$ 1,509	$ 886
MetLife Seguros de Retiro S.A. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Business	$ (162)
Net investment gains (losses)	(130)
Provision for income tax expense (benefit)	$ 32