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Market Risk Benefits Rollforward (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Market Risk Benefit [Line Items]    
Market Risk Benefit, Beginning Balance $ 3,483  
Market Risk Benefit, Ending Balance 2,404  
Retirement Assurance | Asia    
Market Risk Benefit [Line Items]    
Market Risk Benefit, Beginning Balance 226 $ 277
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk 233 284
Attributed fees collected 2 2
Benefit payments (9) 0
Effect of changes in interest rates 2 (17)
Actual policyholder behavior different from expected behavior (1) (1)
Effect of changes in future expected policyholder behavior and other assumptions (1) (1) 5
Effect of foreign currency translation and other, net (30) (58)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk 196 215
Cumulative effect of changes in the instrument-specific credit risk (3) (10)
Effect of foreign currency translation on the cumulative instrument-specific credit risk 0 2
Market Risk Benefit, Ending Balance 193 207
Retirement Assurance | Asia | Guaranteed Minimum Death Benefit [Member]    
Market Risk Benefit [Line Items]    
Net amount at risk 0 0
Retirement Assurance | Asia | Annuitization Benefit [Member]    
Market Risk Benefit [Line Items]    
Net amount at risk $ 116 $ 108
Weighted-average attained age of contractholders 58 years 57 years
Variable Annuity [Member] | MetLife Holdings    
Market Risk Benefit [Line Items]    
Market Risk Benefit, Beginning Balance $ 3,225 $ 5,929
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk 3,360 6,229
Attributed fees collected 286 293
Benefit payments (36) (35)
Effect of changes in interest rates (881) (3,364)
Effect of changes in capital markets (542) 1,189
Effect of changes in equity index volatility (84) 91
Actual policyholder behavior different from expected behavior 95 (2)
Effect of changes in future expected policyholder behavior and other assumptions (1) 9 (326)
Effect of foreign currency translation and other, net 118 (92)
Effect of changes in risk margin (46) (239)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk 2,279 3,744
Cumulative effect of changes in the instrument-specific credit risk (16) (209)
Effect of foreign currency translation on the cumulative instrument-specific credit risk 5 (1)
Market Risk Benefit, Ending Balance 2,268 3,534
Variable Annuity [Member] | MetLife Holdings | Guaranteed Minimum Death Benefit [Member]    
Market Risk Benefit [Line Items]    
Net amount at risk $ 3,979 $ 5,209
Weighted-average attained age of contractholders 70 years 69 years
Variable Annuity [Member] | MetLife Holdings | Annuitization Benefit [Member]    
Market Risk Benefit [Line Items]    
Net amount at risk $ 921 $ 1,452
Weighted-average attained age of contractholders 70 years 70 years
Insurance, Other    
Market Risk Benefit [Line Items]    
Market Risk Benefit, Beginning Balance $ 32 $ 491
Balance, beginning of period, before effect of cumulative changes in the instrument-specific credit risk 24 539
Attributed fees collected 23 47
Benefit payments (23) (1)
Effect of changes in interest rates (98) (509)
Effect of changes in capital markets (15) 146
Effect of changes in equity index volatility (4) 34
Actual policyholder behavior different from expected behavior (21) 25
Effect of changes in future expected policyholder behavior and other assumptions (1) 2 (1)
Effect of foreign currency translation and other, net 37 (174)
Effect of changes in risk margin (2) (59)
Balance, end of period, before the cumulative effect of changes in the instrument-specific credit risk (77) 47
Cumulative effect of changes in the instrument-specific credit risk 20 (3)
Effect of foreign currency translation on the cumulative instrument-specific credit risk 0 1
Market Risk Benefit, Ending Balance (57) 45
Less: Reinsurance recoverable 18 20
Balance, end of period, net of reinsurance $ (75) $ 25