Policyholder Account Balances - LDTI Rollforward (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	$ 221,445
Balance, end of period	232,433
Group Life - Term | Group Benefits
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	7,632	$ 7,692
Deposits	1,860	1,959
Policy charges	(336)	(327)
Surrenders and withdrawals	(1,634)	(1,767)
Benefit payments	(5)	(6)
Net transfers from (to) separate accounts	1	(3)
Interest credited	87	96
Balance, end of period	$ 7,605	$ 7,644
Weighted-average annual crediting rate	2.30%	2.50%
Cash surrender value	$ 7,540	$ 7,584
Group Life - Term | In the event of death | Group Benefits
Policyholder Account Balance [Roll Forward]
Net amount at risk	267,754	264,497
Capital Markets Investment Products and Stable Value GICs | RIS
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	63,715	64,140
Deposits	42,621	37,608
Surrenders and withdrawals	(42,716)	(37,540)
Interest credited	1,202	1,180
Effect of foreign currency translation and other, net	1,735	(443)
Balance, end of period	$ 66,557	$ 64,945
Weighted-average annual crediting rate	3.80%	3.70%
Cash surrender value	$ 1,268	$ 1,850
Annuities and Risk Solutions | RIS
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	20,699	17,711
Deposits	1,983	1,467
Policy charges	(98)	(63)
Surrenders and withdrawals	(307)	(189)
Benefit payments	(541)	(471)
Net transfers from (to) separate accounts	(4)	20
Interest credited	441	360
Other	18	(38)
Balance, end of period	$ 22,191	$ 18,797
Weighted-average annual crediting rate	4.20%	4.00%
Cash surrender value	$ 10,183	$ 8,209
Annuities and Risk Solutions | In the event of death | RIS
Policyholder Account Balance [Roll Forward]
Net amount at risk	46,678	43,702
Universal and Variable Universal Life | Asia
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	50,801	49,739
Deposits	2,817	3,146
Policy charges	(482)	(545)
Surrenders and withdrawals	(1,336)	(1,736)
Benefit payments	(292)	(234)
Interest credited	783	744
Effect of foreign currency translation and other, net	1,273	(1,885)
Balance, end of period	$ 53,564	$ 49,229
Weighted-average annual crediting rate	3.10%	3.10%
Cash surrender value	$ 46,520	$ 43,078
Universal and Variable Universal Life | In the event of death | Asia
Policyholder Account Balance [Roll Forward]
Net amount at risk	86,369	88,255
Fixed Annuity | Asia
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	38,421	36,863
Deposits	3,738	3,412
Policy charges	(2)	(1)
Surrenders and withdrawals	(828)	(1,645)
Benefit payments	(936)	(1,174)
Interest credited	601	509
Effect of foreign currency translation and other, net	425	(335)
Balance, end of period	$ 41,419	$ 37,629
Weighted-average annual crediting rate	3.10%	2.80%
Cash surrender value	$ 36,270	$ 32,555
Fixed Annuity | MetLife Holdings
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	10,142	11,537
Deposits	86	86
Policy charges	(5)	(7)
Surrenders and withdrawals	(670)	(903)
Benefit payments	(191)	(211)
Net transfers from (to) separate accounts	106	58
Interest credited	156	183
Other	1	4
Balance, end of period	$ 9,625	$ 10,747
Weighted-average annual crediting rate	3.20%	3.40%
Cash surrender value	$ 9,074	$ 10,154
Fixed Annuity | In the event of death | Asia
Policyholder Account Balance [Roll Forward]
Net amount at risk	1	0
Fixed Annuity | In the event of death | MetLife Holdings
Policyholder Account Balance [Roll Forward]
Net amount at risk	2,447	2,541
Fixed Annuity | At annuitization or exercise of other living benefits | MetLife Holdings
Policyholder Account Balance [Roll Forward]
Net amount at risk	732	707
Variable Annuity | EMEA
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	2,337	2,720
Deposits	1	2
Policy charges	(26)	(30)
Surrenders and withdrawals	(117)	(142)
Benefit payments	(64)	(61)
Interest credited	34	87
Effect of foreign currency translation and other, net	211	(24)
Balance, end of period	$ 2,376	$ 2,552
Weighted-average annual crediting rate	2.90%	6.80%
Cash surrender value	$ 2,376	$ 2,552
Variable Annuity | In the event of death | EMEA
Policyholder Account Balance [Roll Forward]
Net amount at risk	451	410
Variable Annuity | At annuitization or exercise of other living benefits | EMEA
Policyholder Account Balance [Roll Forward]
Net amount at risk	577	529
Life and Other | MetLife Holdings
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	11,132	11,641
Deposits	397	381
Policy charges	(336)	(347)
Surrenders and withdrawals	(491)	(523)
Benefit payments	(79)	(76)
Net transfers from (to) separate accounts	24	19
Interest credited	200	211
Other	2	(3)
Balance, end of period	$ 10,849	$ 11,303
Weighted-average annual crediting rate	3.70%	3.70%
Cash surrender value	$ 10,304	$ 10,863
Net amount at risk percentage after taking reinsurance into consideration	99.00%	99.00%
Life and Other | In the event of death | MetLife Holdings
Policyholder Account Balance [Roll Forward]
Net amount at risk	$ 62,364	$ 65,885