Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 650,104	$ 759,708
U.S.
Segment Reporting Information [Line Items]
Total assets	253,280	282,741
Asia
Segment Reporting Information [Line Items]
Total assets	141,750	169,291
Latin America
Segment Reporting Information [Line Items]
Total assets	54,991	59,763
EMEA
Segment Reporting Information [Line Items]
Total assets	15,673	27,038
MetLife Holdings
Segment Reporting Information [Line Items]
Total assets	149,134	179,551
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 35,276	$ 41,324