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Future Policy Benefits - FPB - Additional Insurance Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Additional Liability, Long-Duration Insurance [Roll Forward]      
Balance, beginning of period     $ 6,565
Variable Life | Asia      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Balance, beginning of period $ 1,381 $ 1,595 1,824
Less: AOCI adjustment 0 0 0
Balance, beginning of period, before AOCI adjustment 1,381 1,595 1,824
Effect of changes in cash flow assumptions (4) 9 0
Effect of actual variances from expected experience (10) 2 (24)
Adjusted balance 1,367 1,606 1,800
Assessments accrual (3) (3) (3)
Interest accrual 19 21 25
Excess benefits paid (36) (40) (40)
Effect of foreign currency translation and other, net (89) (203) (187)
Balance, end of period, before AOCI adjustment 1,258 1,381 1,595
Add: AOCI adjustment 0 0 0
Balance, end of period $ 1,258 $ 1,381 $ 1,595
Weighted-average duration of the liability 16 years 17 years 18 years
Weighted-average interest accretion rate 1.50% 1.40% 1.50%
Universal and Variable Universal Life | Asia      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Balance, beginning of period $ 455 $ 655 $ 788
Less: AOCI adjustment (33) 56 102
Balance, beginning of period, before AOCI adjustment 488 599 686
Effect of changes in cash flow assumptions (2) (1) 0
Effect of actual variances from expected experience (24) (39) (30)
Adjusted balance 462 559 656
Assessments accrual 0 (3) 5
Interest accrual 7 7 9
Excess benefits paid 0 0 0
Effect of foreign currency translation and other, net (31) (75) (71)
Balance, end of period, before AOCI adjustment 438 488 599
Add: AOCI adjustment (14) (33) 56
Balance, end of period $ 424 $ 455 $ 655
Weighted-average duration of the liability 42 years 42 years 41 years
Weighted-average interest accretion rate 1.40% 1.40% 1.50%
Universal and Variable Universal Life | MetLife Holdings      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Balance, beginning of period $ 2,156 $ 2,117 $ 1,976
Less: AOCI adjustment (63) 67 95
Balance, beginning of period, before AOCI adjustment 2,219 2,050 1,919
Effect of changes in cash flow assumptions 38 35 0
Effect of actual variances from expected experience 0 39 19
Adjusted balance 2,257 2,124 1,938
Assessments accrual 105 103 114
Interest accrual 124 116 107
Excess benefits paid (110) (124) (109)
Balance, end of period, before AOCI adjustment 2,376 2,219 2,050
Add: AOCI adjustment (14) (63) 67
Balance, end of period 2,362 2,156 2,117
Less: Reinsurance recoverables 2,055 745 739
Balance, end of period, net of reinsurance $ 307 $ 1,411 $ 1,378
Weighted-average duration of the liability 15 years 16 years 17 years
Weighted-average interest accretion rate 5.50% 5.60% 5.60%