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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
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Future policy benefits $ 7,441 $ 7,050  
Traditional Life      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Balance, beginning of year 722 797  
Beginning balance of original discount rate 874 974  
Effect of actual variances from expected experience   (4) $ (1)
Balance adjusted for variances from expectation   870 973
Interest accrual 4 19  
Net premiums collected (28) (118)  
Ending Balance at original discount rate 846 874  
Effect of changes in discount rate assumptions 157 152  
Balance, end of year 689 722  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Balance, beginning of year 2,071 2,151  
Beginning balance of original discount rate 2,492 2,665  
Effect of actual variances from expected experience   (9) (24)
Balance adjusted for variances from expectation   2,483 2,641
Interest accrual 14 56  
Benefits payments (51) (205)  
Ending Balance at original discount rate 2,446 2,492  
Effect of changes in discount rate assumptions (439) (421)  
Balance, end of year 2,007 2,071  
Future policy benefits 1,318 1,349  
Less: Reinsurance recoverable 483 413  
Liability for Future Policy Benefit, after Reinsurance, Total $ 835 $ 936  
Weighted-average duration of liability for future policyholder benefits (years) 6 years 11 months 15 days 7 years 4 months 9 days  
Immediate Annuities      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Balance, beginning of year $ 1,415 $ 1,429  
Beginning balance of original discount rate 1,788 1,858  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   (4) (15)
Balance adjusted for variances from expectation   1,784 1,843
Issuances 7 22  
Interest accrual 14 51  
Benefits payments (29) (128)  
Ending Balance at original discount rate 1,776 1,788  
Effect of changes in discount rate assumptions (404) (373)  
Balance, end of year 1,372 1,415  
Future policy benefits 1,372 1,415  
Less: Reinsurance recoverable 113 116  
Liability for Future Policy Benefit, after Reinsurance, Total $ 1,259 $ 1,299  
Weighted-average duration of liability for future policyholder benefits (years) 12 years 10 days 12 years 5 months 19 days  
PRT      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Balance, beginning of year $ 4,189 $ 2,165  
Beginning balance of original discount rate 4,351 2,475  
Effect of changes in cash flow assumptions   11 (9)
Effect of actual variances from expected experience   (8) (7)
Balance adjusted for variances from expectation   4,354 $ 2,459
Issuances 596 2,041  
Interest accrual 49 109  
Benefits payments (107) (258)  
Ending Balance at original discount rate 4,892 4,351  
Effect of changes in discount rate assumptions (237) (162)  
Balance, end of year 4,655 4,189  
Future policy benefits 4,655 4,189  
Less: Reinsurance recoverable 0 0  
Liability for Future Policy Benefit, after Reinsurance, Total $ 4,655 $ 4,189  
Weighted-average duration of liability for future policyholder benefits (years) 7 years 11 months 15 days 8 years 2 months 23 days