Separate Account Liabilities Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Separate Account, Liability [Roll Forward]
Balance, beginning of period	$ 144,634
Balance, end of period	141,003
RIS | Stable Value and Risk Solutions
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,343	$ 48,265
Premiums and deposits	818	652
Policy charges	(64)	(70)
Surrenders and withdrawals	(1,828)	(3,425)
Benefit payments	(27)	(21)
Investment performance	310	1,139
Net transfers from (to) general account	(19)	(57)
Effect of foreign currency translation and other, net	(1,082)	(796)
Balance, end of period	39,451	45,687
Cash Surrender Value	35,132	40,947
RIS | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	11,659	11,694
Premiums and deposits	15	78
Policy charges	(5)	(6)
Surrenders and withdrawals	(172)	(135)
Benefit payments	0	0
Investment performance	(54)	505
Net transfers from (to) general account	0	2
Effect of foreign currency translation and other, net	22	81
Balance, end of period	11,465	12,219
Latin America | Pension Plan
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,320	39,428
Premiums and deposits	1,702	1,963
Policy charges	(67)	(75)
Surrenders and withdrawals	(1,276)	(1,345)
Benefit payments	(404)	(429)
Investment performance	1,797	(393)
Net transfers from (to) general account	0	0
Effect of foreign currency translation and other, net	(4,560)	3,062
Balance, end of period	38,512	42,211
Cash Surrender Value	38,512	42,211
MetLife Holdings | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	29,224	28,499
Premiums and deposits	63	67
Policy charges	(144)	(149)
Surrenders and withdrawals	(885)	(662)
Benefit payments	(129)	(120)
Investment performance	1,767	1,720
Net transfers from (to) general account	(27)	(35)
Effect of foreign currency translation and other, net	(3)	0
Balance, end of period	29,866	29,320
Cash Surrender Value	$ 29,719	$ 29,173