Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 677,279	$ 663,072
U.S.
Segment Reporting Information [Line Items]
Total assets	249,706	252,219
Asia
Segment Reporting Information [Line Items]
Total assets	150,784	148,305
Latin America
Segment Reporting Information [Line Items]
Total assets	70,048	63,687
EMEA
Segment Reporting Information [Line Items]
Total assets	17,654	16,860
MetLife Holdings
Segment Reporting Information [Line Items]
Total assets	149,965	148,749
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 39,122	$ 33,252