Segment Information (Segment Reconciliation to Consolidated Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total Revenues	$ 17,340	$ 17,823	$ 35,909	$ 33,880
Net investment gains (losses)	(273)	(421)	(660)	(796)
Net derivative gains (losses)	(796)	(508)	(364)	(1,487)
Other Income	679	638	1,366	1,312
Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	17,728	18,475	36,372	35,281
Operating Segments | Group Benefits
Segment Reporting Information [Line Items]
Total Revenues	6,756	6,523	13,501	13,168
Other Income	405	382	839	779
Operating Segments | RIS
Segment Reporting Information [Line Items]
Total Revenues	3,500	4,699	8,097	7,601
Other Income	60	61	121	124
Operating Segments | Asia
Segment Reporting Information [Line Items]
Total Revenues	2,909	2,835	5,796	5,687
Other Income	22	18	37	39
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Total Revenues	2,079	1,904	3,999	3,786
Other Income	3	11	12	22
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total Revenues	780	675	1,506	1,349
Other Income	9	8	17	15
Operating Segments | MetLife Holdings
Segment Reporting Information [Line Items]
Total Revenues	1,704	1,839	3,473	3,690
Other Income	36	37	73	87
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net investment gains (losses)	(273)	(421)	(660)	(796)
Net derivative gains (losses)	(796)	(508)	(364)	(1,487)
Investment hedge adjustments	(102)	(172)	(205)	(348)
Unit-linked investment income and Reinsurance adjustments	545	219	361	761
Other Income	$ 238	$ 230	$ 405	$ 469