Deferred Policy Acquisition Costs, Value of Business Acquired, Unearned Revenue and Other Intangibles (DAC and VOBA by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
DAC and VOBA	$ 19,627	$ 20,151	$ 19,653
Group Benefits
Segment Reporting Information [Line Items]
DAC and VOBA	250	258
RIS
Segment Reporting Information [Line Items]
DAC and VOBA	565	413
Asia
Segment Reporting Information [Line Items]
DAC and VOBA	11,720	11,983
Latin America
Segment Reporting Information [Line Items]
DAC and VOBA	2,229	2,447
EMEA
Segment Reporting Information [Line Items]
DAC and VOBA	1,758	1,731
MetLife Holdings
Segment Reporting Information [Line Items]
DAC and VOBA	3,077	3,289
Corporate & Other
Segment Reporting Information [Line Items]
DAC and VOBA	$ 28	$ 30