Separate Account Assets Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 143,175	$ 139,504
Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,286	4,310
Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	274	246
Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	778	830
Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,859	1,950
Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,883	1,808
Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,080	9,082
Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,239	3,061
Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	621	520
Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	26,809	24,642
Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,304	1,285
Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	315	280
Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	17,734	17,497
Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	46,162	43,704
Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,164	9,059
Separate Account, Debt Security | Asset-backed securities and collateralized loan obligations (collectively, “ABS & CLO”)
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,435	2,162
Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	109	8
Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	56,870	54,933
Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	66,491	63,627
Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	10,638	8,707
Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	139,285	131,577
Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,890	7,927
RIS
Fair Value, Separate Account Investment [Line Items]
Separate account assets	47,993	51,420
RIS | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,409	1,398
RIS | Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	273	245
RIS | Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	749	811
RIS | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,809	1,903
RIS | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	939	958
RIS | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,182	3,472
RIS | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	769	775
RIS | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	586	518
RIS | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,683	9,950
RIS | Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,095	1,090
RIS | Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	293	250
RIS | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,307	8,682
RIS | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	19,378	19,972
RIS | Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,164	9,021
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	2,435	2,145
RIS | Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3	8
RIS | Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	29,980	31,146
RIS | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	10,923	10,035
RIS | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,817	2,830
RIS | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	45,129	45,409
RIS | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,864	6,011
Asia
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,744	8,231
Asia | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	341	312
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	29	15
Asia | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	45	34
Asia | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	126	113
Asia | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	517	515
Asia | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4	46
Asia | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	35	0
Asia | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,253	1,115
Asia | Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	209	188
Asia | Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	22	18
Asia | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	756	723
Asia | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,240	2,044
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	0	0
Asia | Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	106	0
Asia | Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,346	2,044
Asia | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,455	3,098
Asia | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,137	2,324
Asia | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,279	7,778
Asia | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	465	453
Latin America
Fair Value, Separate Account Investment [Line Items]
Separate account assets	43,827	38,765
Latin America | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,497	2,557
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	805	729
Latin America | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,946	4,760
Latin America | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,465	2,231
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 | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	12,132	10,545
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	8,216	7,720
Latin America | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	20,348	18,265
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	20,348	18,265
Latin America | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	16,275	14,295
Latin America | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,185	2,353
Latin America | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	43,305	37,470
Latin America | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	522	1,295
EMEA
Fair Value, Separate Account Investment [Line Items]
Separate account assets	6,048	4,875
EMEA | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	39	43
EMEA | Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1	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	5	0
EMEA | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	13	4
EMEA | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	435	309
EMEA | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1	7
EMEA | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
EMEA | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,741	3,017
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	455	320
EMEA | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,196	3,337
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	4,196	3,337
EMEA | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	277	129
EMEA | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,499	1,200
EMEA | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	6,011	4,709
EMEA | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	37	166
MetLife Holdings
Fair Value, Separate Account Investment [Line Items]
Separate account assets	34,210	34,894
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	0	1
MetLife Holdings | Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	4
MetLife Holdings | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	13
MetLife Holdings | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	4
MetLife Holdings | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	26
MetLife Holdings | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	2
MetLife Holdings | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	2
MetLife Holdings | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	15
MetLife Holdings | Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	7
MetLife Holdings | Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	12
MetLife Holdings | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	52
MetLife Holdings | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	86
MetLife Holdings | Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	38
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	0	17
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	0	141
MetLife Holdings | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	34,208	34,751
MetLife Holdings | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
MetLife Holdings | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	34,208	34,892
MetLife Holdings | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2	2
Group Benefits
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,353	1,319
Group Benefits | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | 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
Group Benefits | Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,353	1,319
Group Benefits | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Group Benefits | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,353	1,319
Group Benefits | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 0	$ 0