Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 662,893	$ 759,708
U.S.
Segment Reporting Information [Line Items]
Total assets	251,436	282,741
Asia
Segment Reporting Information [Line Items]
Total assets	148,549	169,291
Latin America
Segment Reporting Information [Line Items]
Total assets	56,233	59,763
EMEA
Segment Reporting Information [Line Items]
Total assets	16,907	27,038
MetLife Holdings
Segment Reporting Information [Line Items]
Total assets	156,189	179,551
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 33,579	$ 41,324