Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,558	$ 6,575	$ 5,418
Other comprehensive income (loss):
Unrealized investment gains (losses), net of related offsets	(47,831)	(8,171)	5,198
Unrealized gains (losses) on derivatives	(85)	137	(286)
Foreign currency translation adjustments	(1,242)	(1,306)	1,169
Defined benefit plans adjustment	279	328	181
Other comprehensive income (loss), before income tax	(48,879)	(9,012)	6,262
Income tax (expense) benefit related to items of other comprehensive income (loss)	10,871	1,862	(1,237)
Other comprehensive income (loss), net of income tax	(38,008)	(7,150)	5,025
Comprehensive income (loss)	(35,450)	(575)	10,443
Less: Comprehensive income (loss) attributable to noncontrolling interest, net of income tax	13	24	16
Comprehensive income (loss) attributable to MetLife, Inc.	$ (35,463)	$ (599)	$ 10,427