Market Risk Benefits Rollforward (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Market Risk Benefit [Line Items]
Beginning balance	$ 2,209
Ending balance	2,357
Retirement Assurance | Asia
Market Risk Benefit [Line Items]
Beginning balance	178	$ 203
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk	179	205
Attributed fees collected	2	2
Benefit payments	(7)	(6)
Effect of changes in interest rates	2	4
Actual policyholder behavior different from expected behavior	0	(1)
Effect of foreign currency translation and other, net	16	(26)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk	192	178
Cumulative effect of changes in the instrument-specific credit risk	(1)	(1)
Ending balance	191	177
Retirement Assurance | Asia | At annuitization or exercise of other living benefits
Market Risk Benefit [Line Items]
Net amount at risk	$ 129	$ 111
Average attained age of policyholders	58 years	58 years
Variable Annuity | MetLife Holdings
Market Risk Benefit [Line Items]
Beginning balance	$ 2,069	$ 2,722
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk	1,992	2,772
Attributed fees collected	167	179
Benefit payments	(46)	(45)
Effect of changes in interest rates	23	(556)
Effect of changes in capital markets	(195)	(372)
Effect of changes in equity index volatility	(4)	26
Actual policyholder behavior different from expected behavior	141	132
Effect of foreign currency translation and other, net	75	5
Effect of changes in risk margin	(2)	(62)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk	2,151	2,079
Cumulative effect of changes in the instrument-specific credit risk	61	76
Effect of foreign currency translation on the cumulative instrument-specific credit risk	2	(2)
Ending balance	2,214	2,153
Variable Annuity | MetLife Holdings | In the event of death
Market Risk Benefit [Line Items]
Net amount at risk	$ 2,452	$ 2,544
Average attained age of policyholders	72 years	71 years
Variable Annuity | MetLife Holdings | At annuitization or exercise of other living benefits
Market Risk Benefit [Line Items]
Net amount at risk	$ 724	$ 671
Average attained age of policyholders	72 years	70 years
Insurance, Other
Market Risk Benefit [Line Items]
Beginning balance	$ (38)	$ (32)
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk	(53)	(50)
Attributed fees collected	23	25
Benefit payments	(2)	(3)
Effect of changes in interest rates	(17)	(46)
Effect of changes in capital markets	(14)	(15)
Effect of changes in equity index volatility	0	(1)
Actual policyholder behavior different from expected behavior	6	4
Effect of foreign currency translation and other, net	(9)	(2)
Effect of changes in risk margin	(1)	(1)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk	(67)	(89)
Cumulative effect of changes in the instrument-specific credit risk	17	21
Effect of foreign currency translation on the cumulative instrument-specific credit risk	2	0
Ending balance	(48)	(68)
Less: Reinsurance recoverable	15	11
Balance, end of period, net of reinsurance	$ (63)	$ (79)