Segment Information (Segment Reconciliation to Consolidated Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 70,986	$ 66,905	$ 68,770
Net investment gains (losses)	(1,184)	(2,824)	(1,260)
Net derivative gains (losses)	(1,623)	(2,140)	(2,251)
Other Income	2,601	2,526	2,630
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	72,226	70,907	73,684
Operating Segments [Member] | Group Benefits
Segment Reporting Information [Line Items]
Total revenues	26,122	25,230	24,402
Other Income	1,534	1,493	1,360
Operating Segments [Member] | RIS
Segment Reporting Information [Line Items]
Total revenues	17,076	16,635	20,518
Other Income	246	271	392
Operating Segments [Member] | Asia
Segment Reporting Information [Line Items]
Total revenues	11,415	10,926	11,255
Other Income	76	86	90
Operating Segments [Member] | Latin America
Segment Reporting Information [Line Items]
Total revenues	7,586	7,371	6,031
Other Income	41	42	39
Operating Segments [Member] | EMEA
Segment Reporting Information [Line Items]
Total revenues	2,770	2,543	2,441
Other Income	32	32	35
Operating Segments [Member] | MetLife Holdings
Segment Reporting Information [Line Items]
Total revenues	7,257	8,202	9,037
Other Income	166	195	155
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net investment gains (losses)	(1,184)	(2,824)	(1,260)
Net derivative gains (losses)	(1,623)	(2,140)	(2,251)
Investment hedge adjustments	(604)	(1,012)	(976)
Unit-linked investment income and Reinsurance adjustments	1,122	1,183	(1,298)
Other Income	$ 1,049	$ 791	$ 871