Separate Account Liabilities Rollforward (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Separate Account, Liability [Roll Forward]
Balance, beginning of period	$ 144,634
Balance, end of period	139,707
RIS | Stable Value and Risk Solutions
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,343	$ 48,265
Premiums and deposits	1,053	1,586
Policy charges	(139)	(148)
Surrenders and withdrawals	(2,945)	(7,542)
Benefit payments	(60)	(46)
Investment performance	692	1,277
Net transfers from (to) general account	(20)	(57)
Effect of foreign currency translation and other, net	(1,235)	(715)
Balance, end of period	38,689	42,620
Cash Surrender Value	34,519	37,782
RIS | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	11,659	11,694
Premiums and deposits	25	120
Policy charges	(10)	(11)
Surrenders and withdrawals	(401)	(360)
Benefit payments	0	0
Investment performance	(95)	448
Net transfers from (to) general account	0	3
Effect of foreign currency translation and other, net	68	(102)
Balance, end of period	11,246	11,792
Latin America | Pension Plan
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,320	39,428
Premiums and deposits	3,427	4,096
Policy charges	(132)	(150)
Surrenders and withdrawals	(2,652)	(2,921)
Benefit payments	(812)	(879)
Investment performance	875	187
Net transfers from (to) general account	0	0
Effect of foreign currency translation and other, net	(3,082)	2,452
Balance, end of period	38,944	42,213
Cash Surrender Value	38,944	42,213
MetLife Holdings | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	29,224	28,499
Premiums and deposits	123	139
Policy charges	(296)	(305)
Surrenders and withdrawals	(1,857)	(1,362)
Benefit payments	(259)	(242)
Investment performance	1,972	2,933
Net transfers from (to) general account	(59)	(47)
Effect of foreign currency translation and other, net	(5)	1
Balance, end of period	28,843	29,616
Cash Surrender Value	$ 28,706	$ 29,471