Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 4,444	$ 1,602	$ 5,302
Other comprehensive income (loss):
Change in Gross Unrealized Temporary Loss	(6,524)	10,325	(56,497)
Deferred gains (losses) on derivatives	211	(1,811)	(85)
Future policy benefits discount rate remeasurement gains (losses)	4,997	(4,361)	31,804
Market risk benefit instrument-specific credit risk remeasurement gains (losses)	(124)	(102)	(219)
Foreign currency translation adjustments	(858)	296	(1,238)
Defined benefit plans adjustment	(5)	88	(279)
Other comprehensive income (loss), before income tax	(2,293)	4,259	(25,956)
Income tax (expense) benefit related to items of other comprehensive income (loss)	353	(898)	5,779
Other comprehensive income (loss), net of income tax	(1,940)	3,361	(20,177)
Comprehensive income (loss)	2,504	4,963	(14,875)
Less: Comprehensive income (loss) attributable to noncontrolling interest, net of income tax	22	6	11
Comprehensive income (loss) attributable to MetLife, Inc.	$ 2,482	$ 4,957	$ (14,886)