Segment Information (Segment Reconciliation To Net Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Adjusted earnings	$ 1,393		$ 1,662		$ 2,808	$ 3,063
Net investment gains (losses)	(273)		(421)		(660)	(796)
Net derivative gains (losses)	(796)		(508)		(364)	(1,487)
MRB remeasurement gains (losses)	277		182		(22)	876
Provision for income tax expense (benefit)	245		249		649	419
Net income (loss)	735	$ 950	953	$ 875	1,685	1,828
Operating Segments
Segment Reporting Information [Line Items]
Adjusted earnings	1,595		1,848		3,192	3,423
Operating Segments | Group Benefits
Segment Reporting Information [Line Items]
Adjusted earnings	400		533		767	817
Provision for income tax expense (benefit)	107		141		204	216
Operating Segments | RIS
Segment Reporting Information [Line Items]
Adjusted earnings	368		410		769	809
Provision for income tax expense (benefit)	90		108		189	213
Operating Segments | Asia
Segment Reporting Information [Line Items]
Adjusted earnings	350		449		724	872
Provision for income tax expense (benefit)	145		176		307	335
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Adjusted earnings	233		226		451	459
Provision for income tax expense (benefit)	84		85		156	183
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Adjusted earnings	100		77		183	154
Provision for income tax expense (benefit)	28		21		54	47
Operating Segments | MetLife Holdings
Segment Reporting Information [Line Items]
Adjusted earnings	144		153		298	312
Provision for income tax expense (benefit)	33		35		69	72
Corporate & Other
Segment Reporting Information [Line Items]
Adjusted earnings	(202)		(186)		(384)	(360)
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)
MRB remeasurement gains (losses)	277		182		(22)	876
Investment hedge adjustments	(102)		(172)		(205)	(348)
Other	41		(60)		(90)	(10)
Provision for income tax expense (benefit)	$ 195		$ 270		$ 218	$ 530