Separate Account Liabilities Rollforward (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Separate Account, Liability [Roll Forward]
Balance, beginning of period	$ 144,634
Balance, end of period	148,809
RIS | Stable Value and Risk Solutions
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,343	$ 48,265
Premiums and deposits	1,669	1,857
Policy charges	(214)	(223)
Surrenders and withdrawals	(3,799)	(8,696)
Benefit payments	(81)	(74)
Investment performance	2,152	711
Net transfers from (to) general account	(21)	(57)
Effect of foreign currency translation and other, net (1)	(601)	(1,280)
Balance, end of period	40,448	40,503
Cash Surrender Value	35,632	36,246
RIS | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	11,659	11,694
Premiums and deposits	34	154
Policy charges	(16)	(17)
Surrenders and withdrawals	(609)	(636)
Benefit payments	0	0
Investment performance	561	(157)
Net transfers from (to) general account	0	3
Effect of foreign currency translation and other, net (1)	360	111
Balance, end of period	11,989	11,152
Latin America | Pension Plan
Separate Account, Liability [Roll Forward]
Balance, beginning of period	41,320	39,428
Premiums and deposits	5,082	6,181
Policy charges	(198)	(219)
Surrenders and withdrawals	(3,913)	(4,485)
Benefit payments	(1,231)	(1,301)
Investment performance	4,075	(216)
Net transfers from (to) general account	0	0
Effect of foreign currency translation and other, net (1)	(977)	(1,915)
Balance, end of period	44,158	37,473
Cash Surrender Value	44,158	37,473
MetLife Holdings | Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of period	29,224	28,499
Premiums and deposits	175	190
Policy charges	(454)	(460)
Surrenders and withdrawals	(2,798)	(2,114)
Benefit payments	(377)	(350)
Investment performance	3,691	1,740
Net transfers from (to) general account	(105)	(49)
Effect of foreign currency translation and other, net (1)	(7)	(1)
Balance, end of period	29,349	27,455
Cash Surrender Value	$ 29,210	$ 27,320