Separate Account Assets Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 139,707	$ 144,634
Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,582	6,265
Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	126	144
Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	777	904
Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,829	1,929
Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	937	1,018
Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,579	9,687
Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,062	4,403
Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,392	5,055
Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	484	550
Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,882	5,388
Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	18,440	19,611
Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,303	1,389
Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	343	424
Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	22,186	23,690
Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	47,154	50,502
Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,421	9,706
Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,377	2,586
Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9	9
Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	58,961	62,803
Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	69,976	68,439
Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	132	115
Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,773	1,733
Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,039	8,202
Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	212	158
Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	59,820	58,231
Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	134,519	137,507
Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,188	7,127
RIS
Fair Value, Separate Account Investment [Line Items]
Separate account assets	50,033	53,093
RIS \| Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,504	1,620
RIS \| Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	125	144
RIS \| Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	759	893
RIS \| Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,783	1,882
RIS \| Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	832	911
RIS \| Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,512	2,717
RIS \| Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	705	764
RIS \| Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,947	1,920
RIS \| Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	474	547
RIS \| Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	530	509
RIS \| Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,307	9,673
RIS \| Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,078	1,077
RIS \| Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	306	380
RIS \| Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,137	9,778
RIS \| Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	20,358	21,417
RIS \| Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,381	9,671
RIS \| Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,349	2,557
RIS \| Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9	9
RIS \| Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	32,097	33,654
RIS \| Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	12,437	11,726
RIS \| Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
RIS \| Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	705	731
RIS \| Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,392	2,411
RIS \| Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	64	67
RIS \| Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,276	8,517
RIS \| Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	46,038	47,000
RIS \| Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,995	6,093
Asia
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,102	9,187
Asia \| Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	383	403
Asia \| Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia \| Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	15	8
Asia \| Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	36	39
Asia \| Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	102	105
Asia \| Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	500	551
Asia \| Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	53	38
Asia \| Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia \| Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	7	0
Asia \| Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,184	1,190
Asia \| Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia \| Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	220	308
Asia \| Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	24	31
Asia \| Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	713	741
Asia \| Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,141	2,270
Asia \| Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia \| Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	17	18
Asia \| Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia \| Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,158	2,288
Asia \| Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	6,107	5,993
Asia \| Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	132	115
Asia \| Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	309	269
Asia \| Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,610	2,661
Asia \| Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	20	19
Asia \| Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,036	2,929
Asia \| Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,648	8,684
Asia \| Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	454	503
Latin America
Fair Value, Separate Account Investment [Line Items]
Separate account assets	38,944	41,320
Latin America \| Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,621	4,212
Latin America \| Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,268	6,006
Latin America \| Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,302	3,598
Latin America \| Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,425	3,095
Latin America \| Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	279	1,051
Latin America \| Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,115	9,920
Latin America \| Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	11,995	12,699
Latin America \| Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	21,389	23,670
Latin America \| Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	21,389	23,670
Latin America \| Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	13,316	12,944
Latin America \| Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	386	392
Latin America \| Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,258	2,453
Latin America \| Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Latin America \| Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	10,672	10,099
Latin America \| Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	38,326	40,826
Latin America \| Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	618	494
EMEA
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,777	4,327
EMEA \| Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	74	30
EMEA \| Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	281	398
EMEA \| Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8	27
EMEA \| Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,889	2,638
EMEA \| Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	289	425
EMEA \| Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,178	3,063
EMEA \| Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,178	3,063
EMEA \| Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,407	1,199
EMEA \| Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA \| Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	373	341
EMEA \| Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	779	677
EMEA \| Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	128	72
EMEA \| Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	127	109
EMEA \| Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,659	4,292
EMEA \| Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	118	35
MetLife Holdings
Fair Value, Separate Account Investment [Line Items]
Separate account assets	35,581	35,548
MetLife Holdings \| Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Debt Security \| Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1	0
MetLife Holdings \| Separate Account, Debt Security \| Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3	3
MetLife Holdings \| Separate Account, Debt Security \| Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	10	8
MetLife Holdings \| Separate Account, Debt Security \| Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3	2
MetLife Holdings \| Separate Account, Debt Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	18	15
MetLife Holdings \| Separate Account, Debt Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2	3
MetLife Holdings \| Separate Account, Debt Security \| Foreign
Fair Value, Separate Account Investment [Line Items]
Separate account assets	12	13
MetLife Holdings \| Separate Account, Debt Security \| Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3	3
MetLife Holdings \| Separate Account, Debt Security \| Foreign government
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Debt Security \| U.S. government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	18	18
MetLife Holdings \| Separate Account, Debt Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5	4
MetLife Holdings \| Separate Account, Debt Security \| Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	13	13
MetLife Holdings \| Separate Account, Debt Security \| Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	52	47
MetLife Holdings \| Separate Account, Debt Security \| Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	88	82
MetLife Holdings \| Separate Account, Debt Security \| Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	40	35
MetLife Holdings \| Separate Account, Debt Security \| Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	11	11
MetLife Holdings \| Separate Account, Debt Security \| Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Debt Security \| Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	139	128
MetLife Holdings \| Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	35,439	35,418
MetLife Holdings \| Separate Account, Equity Security \| Non-redeemable preferred Stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Equity Security \| Financial Services Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Equity Security \| Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Equity Security \| Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings \| Separate Account, Equity Security \| Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	35,439	35,418
MetLife Holdings \| Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	35,578	35,546

Separate Account Assets Fair Value (Details) - USD ($)
$ in Millions

Jun. 30, 2024

Dec. 31, 2023

Fair Value, Separate Account Investment [Line Items]

Separate account assets

$ 139,707

$ 144,634

Other invested assets

Fair Value, Separate Account Investment [Line Items]

Separate account assets

5,582

6,265