Future Policy Benefits - Disaggregate Rollforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for FPBs	$ 193,646	$ 196,406
Fixed & Immediate Annuities | RIS
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period, at current discount rate at balance sheet date	0	0	$ 0
Balance, beginning of period, at original discount rate	0	0	0
Effect of changes in cash flow assumptions	0	0	0
Effect of actual variances from expected experience	(48)	(106)	(94)
Adjusted balance	(48)	(106)	(94)
Issuances	7,985	6,572	12,672
Net premiums collected	(7,937)	(6,466)	(12,578)
Ending balance at original discount rate	0	0	0
Balance, end of period, at current discount rate at balance sheet date	0	0	0
Balance, beginning of period, at current discount rate at balance sheet date	64,515	58,695	62,954
Balance, beginning of period, at original discount rate	64,737	61,426	50,890
Effect of changes in cash flow assumptions	(195)	(284)	(115)
Effect of actual variances from expected experience	(121)	(270)	(175)
Adjusted balance	64,421	60,872	50,600
Issuances	8,129	6,588	12,770
Interest accrual	3,146	2,897	2,519
Benefit payments	(6,050)	(5,620)	(4,463)
Effect of foreign currency translation	(3)	0	0
Ending balance at original discount rate	69,643	64,737	61,426
Effect of changes in discount rate assumptions	(3,022)	(222)	(2,731)
Balance, end of period, at current discount rate at balance sheet date	66,621	64,515	58,695
Cumulative amount of fair value hedging adjustments	(359)	(191)	(200)
Net liability for FPBs	66,262	64,324	58,495
Less: Reinsurance recoverables (Amount due to reinsurer)	1,919	269	0
Net liability for FPBs, net of reinsurance	64,343	64,055	58,495
Undiscounted - Expected future benefit payments	126,735	130,878	113,932
Discounted - Expected future benefit payments (at current discount rate at balance sheet date)	$ 66,621	$ 64,515	$ 58,695
Weighted-average duration of the liability	8 years	9 years	9 years
Weighted -average interest accretion (original locked-in) rate	4.80%	4.70%	4.60%
Weighted-average current discount rate at balance sheet date	5.60%	5.10%	5.50%
Deferred Profit Liability Offset to Changes in Cash Flow Assumptions	$ 62	$ 211	$ 128
Deferred Profit Liability Offset to Actual Versus Expected	35	118	46
Whole and Term Life & Endowments | Asia
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period, at current discount rate at balance sheet date	4,561	4,682	5,986
Balance, beginning of period, at original discount rate	4,793	4,943	5,881
Effect of changes in cash flow assumptions	58	11	69
Effect of actual variances from expected experience	(98)	(62)	28
Adjusted balance	4,753	4,892	5,978
Issuances	558	730	231
Interest accrual	70	59	44
Net premiums collected	(604)	(611)	(615)
Effect of foreign currency translation	(491)	(277)	(695)
Ending balance at original discount rate	4,286	4,793	4,943
Effect of changes in discount rate assumptions	(288)	(242)	(247)
Effect of foreign currency translation on the effect of changes in discount rate assumptions	25	10	(14)
Balance, end of period, at current discount rate at balance sheet date	4,023	4,561	4,682
Balance, beginning of period, at current discount rate at balance sheet date	17,435	17,463	24,453
Balance, beginning of period, at original discount rate	17,198	18,209	21,276
Effect of changes in cash flow assumptions	36	58	96
Effect of actual variances from expected experience	(135)	(30)	54
Adjusted balance	17,099	18,237	21,426
Issuances	558	729	231
Interest accrual	368	370	364
Benefit payments	(958)	(1,174)	(1,406)
Effect of foreign currency translation	(1,815)	(964)	(2,406)
Ending balance at original discount rate	15,252	17,198	18,209
Effect of changes in discount rate assumptions	11	224	(475)
Effect of foreign currency translation on the effect of changes in discount rate assumptions	(73)	13	(271)
Balance, end of period, at current discount rate at balance sheet date	15,190	17,435	17,463
Cumulative impact of flooring the future policyholder benefits reserve	0	0	11
Net liability for FPBs	11,167	12,874	12,792
Less: Reinsurance recoverables (Amount due to reinsurer)	(2)	(1)	(1)
Net liability for FPBs, net of reinsurance	11,169	12,875	12,793
Undiscounted - Expected future gross premiums	8,678	9,331	9,369
Undiscounted - Expected future benefit payments	25,422	28,130	28,507
Discounted - Expected future gross premiums	7,316	8,067	8,086
Discounted - Expected future benefit payments (at current discount rate at balance sheet date)	$ 15,190	$ 17,435	$ 17,463
Weighted-average duration of the liability	17 years	17 years	15 years
Weighted -average interest accretion (original locked-in) rate	2.60%	2.50%	2.30%
Weighted-average current discount rate at balance sheet date	2.80%	2.60%	2.70%
Deferred Profit Liability Offset to Changes in Cash Flow Assumptions	$ 28		$ (13)
Accident & health insurance | Asia
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period, at current discount rate at balance sheet date	19,835	$ 21,181	26,543
Balance, beginning of period, at original discount rate	21,232	22,594	25,937
Effect of changes in cash flow assumptions	439	867	24
Effect of actual variances from expected experience	(205)	(158)	297
Adjusted balance	21,466	23,303	26,258
Issuances	1,032	1,030	1,387
Interest accrual	223	236	250
Net premiums collected	(1,843)	(2,016)	(2,160)
Effect of foreign currency translation	(2,058)	(1,321)	(3,141)
Ending balance at original discount rate	18,820	21,232	22,594
Effect of changes in discount rate assumptions	(1,772)	(1,449)	(1,341)
Effect of foreign currency translation on the effect of changes in discount rate assumptions	155	52	(72)
Balance, end of period, at current discount rate at balance sheet date	17,203	19,835	21,181
Balance, beginning of period, at current discount rate at balance sheet date	30,480	30,879	41,874
Balance, beginning of period, at original discount rate	36,010	37,189	41,517
Effect of changes in cash flow assumptions	439	898	(7)
Effect of actual variances from expected experience	(203)	(180)	363
Adjusted balance	36,246	37,907	41,873
Issuances	1,030	1,028	1,387
Interest accrual	470	485	498
Benefit payments	(1,268)	(1,279)	(1,613)
Effect of foreign currency translation	(3,640)	(2,131)	(4,956)
Ending balance at original discount rate	32,838	36,010	37,189
Effect of changes in discount rate assumptions	(6,890)	(5,793)	(6,291)
Effect of foreign currency translation on the effect of changes in discount rate assumptions	617	263	(19)
Balance, end of period, at current discount rate at balance sheet date	26,565	30,480	30,879
Cumulative impact of flooring the future policyholder benefits reserve	44	67	342
Net liability for FPBs	9,406	10,712	10,040
Less: Reinsurance recoverables (Amount due to reinsurer)	142	142	143
Net liability for FPBs, net of reinsurance	9,264	10,570	9,897
Undiscounted - Expected future gross premiums	36,908	41,734	43,440
Undiscounted - Expected future benefit payments	43,016	47,046	48,147
Discounted - Expected future gross premiums	29,436	34,356	36,179
Discounted - Expected future benefit payments (at current discount rate at balance sheet date)	$ 26,565	$ 30,480	$ 30,879
Weighted-average duration of the liability	23 years	25 years	17 years
Weighted -average interest accretion (original locked-in) rate	1.70%	1.70%	1.70%
Weighted-average current discount rate at balance sheet date	2.80%	2.50%	2.70%
Deferred Profit Liability Offset to Changes in Cash Flow Assumptions		$ (10)	$ 44
Deferred Profit Liability Offset to Actual Versus Expected		4	(20)
Fixed Annuity | Latin America
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period, at current discount rate at balance sheet date	$ 0	0	0
Balance, beginning of period, at original discount rate	0	0	0
Effect of changes in cash flow assumptions	0	0	0
Effect of actual variances from expected experience	0	0	1
Adjusted balance	0	0	1
Issuances	1,020	1,045	714
Interest accrual	21	29	(3)
Net premiums collected	(1,041)	(1,074)	(712)
Ending balance at original discount rate	0	0	0
Balance, end of period, at current discount rate at balance sheet date	0	0	0
Balance, beginning of period, at current discount rate at balance sheet date	9,637	9,265	7,343
Balance, beginning of period, at original discount rate	9,249	8,240	6,851
Effect of changes in cash flow assumptions	(4)	(5)	(8)
Effect of actual variances from expected experience	(2)	(31)	(32)
Adjusted balance	9,243	8,204	6,811
Issuances	1,065	1,153	757
Interest accrual	339	341	286
Benefit payments	(701)	(671)	(560)
Inflation adjustment	391	415	896
Effect of foreign currency translation	(1,204)	(193)	50
Ending balance at original discount rate	9,133	9,249	8,240
Effect of changes in discount rate assumptions	536	391	1,026
Effect of foreign currency translation on the effect of changes in discount rate assumptions	(69)	(3)	(1)
Balance, end of period, at current discount rate at balance sheet date	9,600	9,637	9,265
Net liability for FPBs	9,600	9,637	9,265
Undiscounted - Expected future benefit payments	13,660	13,994	12,675
Discounted - Expected future benefit payments (at current discount rate at balance sheet date)	$ 9,600	$ 9,637	$ 9,265
Weighted-average duration of the liability	11 years	11 years	11 years
Weighted -average interest accretion (original locked-in) rate	3.50%	3.60%	3.90%
Weighted-average current discount rate at balance sheet date	3.10%	3.30%	2.70%
Deferred Profit Liability Offset to Changes in Cash Flow Assumptions	$ 3	$ 4	$ 7
Deferred Profit Liability Offset to Actual Versus Expected			20
Long-term Care | MetLife Holdings
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period, at current discount rate at balance sheet date	5,687	5,775	7,058
Balance, beginning of period, at original discount rate	5,566	5,807	5,699
Effect of changes in cash flow assumptions	212	(152)	272
Effect of actual variances from expected experience	74	199	120
Adjusted balance	5,852	5,854	6,091
Interest accrual	285	294	298
Net premiums collected	(569)	(582)	(582)
Ending balance at original discount rate	5,568	5,566	5,807
Effect of changes in discount rate assumptions	(93)	121	(32)
Balance, end of period, at current discount rate at balance sheet date	5,475	5,687	5,775
Balance, beginning of period, at current discount rate at balance sheet date	20,927	19,619	27,627
Balance, beginning of period, at original discount rate	20,494	20,165	19,406
Effect of changes in cash flow assumptions	205	(190)	301
Effect of actual variances from expected experience	84	223	115
Adjusted balance	20,783	20,198	19,822
Interest accrual	1,089	1,070	1,043
Benefit payments	(848)	(774)	(700)
Ending balance at original discount rate	21,024	20,494	20,165
Effect of changes in discount rate assumptions	(1,012)	433	(546)
Balance, end of period, at current discount rate at balance sheet date	20,012	20,927	19,619
Other adjustments	0	0	1
Net liability for FPBs	14,537	15,240	13,845
Undiscounted - Expected future gross premiums	10,644	10,603	11,201
Undiscounted - Expected future benefit payments	44,981	45,016	45,872
Discounted - Expected future gross premiums	6,966	7,139	7,200
Discounted - Expected future benefit payments (at current discount rate at balance sheet date)	$ 20,012	$ 20,927	$ 19,619
Weighted-average duration of the liability	14 years	15 years	15 years
Weighted -average interest accretion (original locked-in) rate	5.40%	5.40%	5.50%
Weighted-average current discount rate at balance sheet date	5.80%	5.20%	5.60%