Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 675,745	$ 687,584
Group Benefits
Segment Reporting Information [Line Items]
Total assets	35,966	36,715
RIS
Segment Reporting Information [Line Items]
Total assets	222,719	218,587
Asia
Segment Reporting Information [Line Items]
Total assets	151,700	157,206
Latin America
Segment Reporting Information [Line Items]
Total assets	66,527	69,177
EMEA
Segment Reporting Information [Line Items]
Total assets	18,846	18,596
MetLife Holdings
Segment Reporting Information [Line Items]
Total assets	144,045	148,524
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 35,942	$ 38,779