Separate Account Assets Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 138,143	$ 139,504
Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,959	4,310
Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	282	246
Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	760	830
Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,888	1,950
Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,897	1,808
Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,035	9,082
Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,258	3,061
Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	599	520
Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	25,274	24,642
Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,282	1,285
Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	316	280
Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	17,719	17,497
Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	44,591	43,704
Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,296	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	2,404	2,162
Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8	8
Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	55,299	54,933
Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	62,974	63,627
Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,093	8,707
Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	132,325	131,577
Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,818	7,927
RIS
Fair Value, Separate Account Investment [Line Items]
Separate account assets	49,452	51,420
RIS | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,468	1,398
RIS | Separate Account, Debt Security | Materials
Fair Value, Separate Account Investment [Line Items]
Separate account assets	281	245
RIS | Separate Account, Debt Security | Communications
Fair Value, Separate Account Investment [Line Items]
Separate account assets	746	811
RIS | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,850	1,903
RIS | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	978	958
RIS | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,283	3,472
RIS | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	768	775
RIS | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	599	518
RIS | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	9,665	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	297	250
RIS | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,505	8,682
RIS | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	19,562	19,972
RIS | Separate Account, Debt Security | Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,296	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	2,404	2,145
RIS | Separate Account, Debt Security | Redeemable preferred stock
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8	8
RIS | Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	30,270	31,146
RIS | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	10,669	10,035
RIS | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,595	2,830
RIS | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	45,002	45,409
RIS | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,450	6,011
Asia
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8,245	8,231
Asia | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	313	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	14	15
Asia | Separate Account, Debt Security | Consumer
Fair Value, Separate Account Investment [Line Items]
Separate account assets	34	34
Asia | Separate Account, Debt Security | Energy
Fair Value, Separate Account Investment [Line Items]
Separate account assets	109	113
Asia | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	461	515
Asia | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	42	46
Asia | Separate Account, Debt Security | Technology
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	0
Asia | Separate Account, Debt Security | Government and agency
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,177	1,115
Asia | Separate Account, Debt Security | Public utilities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	187	188
Asia | Separate Account, Debt Security | Municipals
Fair Value, Separate Account Investment [Line Items]
Separate account assets	19	18
Asia | Separate Account, Debt Security | Total corporate bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	660	723
Asia | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,043	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	0	0
Asia | Separate Account, Debt Security | Total fixed maturity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,043	2,044
Asia | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,066	3,098
Asia | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,352	2,324
Asia | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	7,774	7,778
Asia | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	471	453
Latin America
Fair Value, Separate Account Investment [Line Items]
Separate account assets	41,179	38,765
Latin America | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,149	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	797	729
Latin America | Separate Account, Debt Security | Financial
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,882	4,760
Latin America | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,448	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	11,140	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	8,127	7,720
Latin America | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	19,267	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	19,267	18,265
Latin America | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	15,114	14,295
Latin America | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,806	2,353
Latin America | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	40,336	37,470
Latin America | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	843	1,295
EMEA
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,337	4,875
EMEA | Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	29	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	4	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	409	309
EMEA | Separate Account, Debt Security | Commercial and Industrial Sector
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	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	3,292	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	427	320
EMEA | Separate Account, Debt Security | Total bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,719	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	3,719	3,337
EMEA | Separate Account, Equity Security | Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	195	129
EMEA | Separate Account, Equity Security | Separate Account, Equity Security
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,340	1,200
EMEA | Investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,283	4,709
EMEA | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	54	166
MetLife Holdings
Fair Value, Separate Account Investment [Line Items]
Separate account assets	32,689	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	32,689	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	32,689	34,892
MetLife Holdings | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	0	2
Group Benefits
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,241	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	1,241	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	1,241	1,319
Group Benefits | Other Assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 0	$ 0