Deferred Policy Acquisition Costs, Value of Business Acquired, Unearned Revenue and Other Intangibles (DAC and VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
DAC:
Balance at January 1,	$ 18,388	$ 17,644	$ 17,415
Capitalization of DAC	2,833	2,917	2,614
Amortization	(1,912)	(1,791)	(1,655)
Effect of foreign currency translation and other, net	(1,131)	(382)	(730)
Balance at December 31,	18,178	18,388	17,644
VOBA:
Balance at January 1,	1,763	2,009	2,391
Total amortization of VOBA	134	161	176
Effect of foreign currency translation and other, net	(180)	(85)	(206)
Balance at December 31,	1,449	1,763	2,009
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	19,627	20,151	19,653
Deferred policy acquisition costs and value of business acquired	19,627	20,151	19,653
Group Benefits
DAC:
Balance at January 1,	258	264	272
Capitalization of DAC	18	20	18
Amortization	(26)	(26)	(26)
Effect of foreign currency translation and other, net	0	0	0
Balance at December 31,	250	258	264
VOBA:
Balance at January 1,	0	0	0
Total amortization of VOBA	0	0	0
Effect of foreign currency translation and other, net	0	0	0
Balance at December 31,	0	0	0
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	250	258
Deferred policy acquisition costs and value of business acquired	250	258
RIS
DAC:
Balance at January 1,	397	267	191
Capitalization of DAC	218	176	113
Amortization	(63)	(46)	(37)
Effect of foreign currency translation and other, net	0	0	0
Balance at December 31,	552	397	267
VOBA:
Balance at January 1,	16	19	22
Total amortization of VOBA	3	3	3
Effect of foreign currency translation and other, net	0	0	0
Balance at December 31,	13	16	19
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	565	413
Deferred policy acquisition costs and value of business acquired	565	413
Asia
DAC:
Balance at January 1,	10,864	10,270	10,058
Capitalization of DAC	1,380	1,583	1,530
Amortization	(782)	(705)	(644)
Effect of foreign currency translation and other, net	(677)	(284)	(674)
Balance at December 31,	10,785	10,864	10,270
VOBA:
Balance at January 1,	1,119	1,290	1,593
Total amortization of VOBA	71	89	101
Effect of foreign currency translation and other, net	(113)	(82)	(202)
Balance at December 31,	935	1,119	1,290
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	11,720	11,983
Deferred policy acquisition costs and value of business acquired	11,720	11,983
Latin America
DAC:
Balance at January 1,	1,950	1,542	1,361
Capitalization of DAC	704	651	494
Amortization	(461)	(418)	(361)
Effect of foreign currency translation and other, net	(357)	175	48
Balance at December 31,	1,836	1,950	1,542
VOBA:
Balance at January 1,	497	545	591
Total amortization of VOBA	42	50	49
Effect of foreign currency translation and other, net	(62)	2	3
Balance at December 31,	393	497	545
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	2,229	2,447
Deferred policy acquisition costs and value of business acquired	2,229	2,447
EMEA
DAC:
Balance at January 1,	1,618	1,480	1,472
Capitalization of DAC	486	457	422
Amortization	(345)	(332)	(311)
Effect of foreign currency translation and other, net	(95)	13	(103)
Balance at December 31,	1,664	1,618	1,480
VOBA:
Balance at January 1,	113	127	154
Total amortization of VOBA	14	16	20
Effect of foreign currency translation and other, net	(5)	2	(7)
Balance at December 31,	94	113	127
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	1,758	1,731
Deferred policy acquisition costs and value of business acquired	1,758	1,731
MetLife Holdings
DAC:
Balance at January 1,	3,271	3,791	4,029
Capitalization of DAC	17	22	29
Amortization	(225)	(255)	(267)
Effect of foreign currency translation and other, net	0	(287)	0
Balance at December 31,	3,063	3,271	3,791
VOBA:
Balance at January 1,	18	28	31
Total amortization of VOBA	4	3	3
Effect of foreign currency translation and other, net	0	(7)	0
Balance at December 31,	14	18	28
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	3,077	3,289
Deferred policy acquisition costs and value of business acquired	3,077	3,289
Corporate And Other
DAC:
Balance at January 1,	30	30	32
Capitalization of DAC	10	8	8
Amortization	(10)	(9)	(9)
Effect of foreign currency translation and other, net	(2)	1	(1)
Balance at December 31,	28	30	30
VOBA:
Balance at January 1,	0	0	0
Total amortization of VOBA	0	0	0
Effect of foreign currency translation and other, net	0	0	0
Balance at December 31,	0	0	$ 0
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net, Ending Balance	28	30
Deferred policy acquisition costs and value of business acquired	$ 28	$ 30