Segment Information (Segment Reconciliation to Consolidated Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total Revenues	$ 18,569	$ 16,057
Net investment gains (losses)	(387)	(375)
Net derivative gains (losses)	432	(979)
Other Income	687	674
Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	18,644	16,806
Operating Segments | Group Benefits
Segment Reporting Information [Line Items]
Total Revenues	6,745	6,645
Other Income	434	397
Operating Segments | RIS
Segment Reporting Information [Line Items]
Total Revenues	4,597	2,902
Other Income	61	63
Operating Segments | Asia
Segment Reporting Information [Line Items]
Total Revenues	2,887	2,852
Other Income	15	21
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Total Revenues	1,920	1,882
Other Income	9	11
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total Revenues	726	674
Other Income	8	7
Operating Segments | MetLife Holdings
Segment Reporting Information [Line Items]
Total Revenues	1,769	1,851
Other Income	37	50
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net investment gains (losses)	(387)	(375)
Net derivative gains (losses)	432	(979)
Investment hedge adjustments	(103)	(176)
Unit-linked investment income and Reinsurance adjustments	(184)	542
Other Income	$ 167	$ 239