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Future Policy Benefits - Summary Balances and Changes in the Present Value of Expected Net Premiums and Present Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Effect of changes in cash flow assumptions     $ 0  
Future policy benefits $ 7,050 $ 5,021 4,918  
Less: Reinsurance recoverable       $ 1,115
Traditional Life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance, beginning of year 797 1,020 1,152  
Beginning balance of original discount rate 974 1,045 1,131  
Effect of actual variances from expected experience   (1) 33 25
Balance adjusted for variances from expectation   973 1,078 1,156
Interest accrual 19 20 22  
Net premiums collected (118) (124) (133)  
Ending Balance at original discount rate 874 974 1,045  
Effect of changes in discount rate assumptions 152 177 25  
Balance, end of year 722 797 1,020  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year 2,151 2,772 3,105  
Beginning balance of original discount rate 2,665 2,806 2,995  
Effect of actual variances from expected experience   (24) 13 (14)
Balance adjusted for variances from expectation   2,641 2,819 2,981
Interest accrual 56 59 62  
Benefits payments (205) (213) (237)  
Ending Balance at original discount rate 2,492 2,665 2,806  
Effect of changes in discount rate assumptions (421) (514) (34)  
Balance, end of year 2,071 2,151 2,772  
Future policy benefits 1,349 1,354 1,752  
Less: Reinsurance recoverable 413 612 749 793
Liability for Future Policy Benefit, after Reinsurance, Total $ 936 $ 742 $ 1,003  
Weighted-average duration of liability for future policyholder benefits (years) 7 years 4 months 9 days 7 years 6 months 29 days 8 years 6 months 14 days  
PRT        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year $ 2,165 $ 1,148 $ 0  
Beginning balance of original discount rate 2,475 1,151 0  
Effect of changes in cash flow assumptions   (9) (20)  
Effect of actual variances from expected experience   (7) 2 0
Balance adjusted for variances from expectation   2,459 1,133 0
Issuances 2,041 1,418 1,155  
Interest accrual 109 50 2  
Benefits payments (258) (126) (6)  
Ending Balance at original discount rate 4,351 2,475 1,151  
Effect of changes in discount rate assumptions (162) (310) (3)  
Balance, end of year 4,189 2,165 1,148  
Future policy benefits 4,189 2,165 1,148  
Less: Reinsurance recoverable 0 0 0  
Liability for Future Policy Benefit, after Reinsurance, Total $ 4,189 $ 2,165 $ 1,148  
Weighted-average duration of liability for future policyholder benefits (years) 8 years 2 months 23 days 8 years 1 month 2 days 8 years 9 months  
Immediate Annuities        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year $ 1,429 $ 1,954 $ 2,153  
Beginning balance of original discount rate 1,858 1,935 2,040  
Effect of changes in cash flow assumptions   0 0  
Effect of actual variances from expected experience   (15) (26) (47)
Balance adjusted for variances from expectation   1,843 1,909 1,993
Issuances 22 26 18  
Interest accrual 51 60 60  
Benefits payments (128) (137) (136)  
Ending Balance at original discount rate 1,788 1,858 1,935  
Effect of changes in discount rate assumptions (373) (429) 19  
Balance, end of year 1,415 1,429 1,954  
Future policy benefits 1,415 1,429 1,954  
Less: Reinsurance recoverable 116 118 145 $ 322
Liability for Future Policy Benefit, after Reinsurance, Total $ 1,299 $ 1,311 $ 1,809  
Weighted-average duration of liability for future policyholder benefits (years) 12 years 5 months 19 days 11 years 9 months 3 days 13 years 7 months 9 days