Segment Information (Segment Reconciliation To Net Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Adjusted earnings	$ 1,415	$ 1,401
Net investment gains (losses)	(387)	(375)
Net derivative gains (losses)	432	(979)
MRB remeasurement gains (losses)	(299)	694
Provision for income tax expense (benefit)	404	170
Net income (loss)	950	875
Operating Segments
Segment Reporting Information [Line Items]
Adjusted earnings	1,597	1,575
Operating Segments | Group Benefits
Segment Reporting Information [Line Items]
Adjusted earnings	367	284
Provision for income tax expense (benefit)	97	75
Operating Segments | RIS
Segment Reporting Information [Line Items]
Adjusted earnings	401	399
Provision for income tax expense (benefit)	99	105
Operating Segments | Asia
Segment Reporting Information [Line Items]
Adjusted earnings	374	423
Provision for income tax expense (benefit)	162	159
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Adjusted earnings	218	233
Provision for income tax expense (benefit)	72	98
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Adjusted earnings	83	77
Provision for income tax expense (benefit)	26	26
Operating Segments | MetLife Holdings
Segment Reporting Information [Line Items]
Adjusted earnings	154	159
Provision for income tax expense (benefit)	36	37
Corporate & Other
Segment Reporting Information [Line Items]
Adjusted earnings	(182)	(174)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net investment gains (losses)	(387)	(375)
Net derivative gains (losses)	432	(979)
MRB remeasurement gains (losses)	(299)	694
Investment hedge adjustments	(103)	(176)
Other	(131)	50
Provision for income tax expense (benefit)	$ 23	$ 260