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Policyholder Liabilities (Changes in Policyholder Account Balances) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Policyholder Account Balance [Roll Forward]    
Balance, beginning of period $ 60,901,641  
Balance, end of period 60,980,242 $ 60,901,641
Fixed Rate Annuities    
Policyholder Account Balance [Roll Forward]    
Balance, beginning of period 5,913,965 6,589,577
Issuances 1,232,426 840,022
Premiums received 566 12,472
Policy charges (2,256) (3,428)
Surrenders and withdrawals (1,464,230) (1,668,966)
Benefit payments (3,715) (13,085)
Interest credited 43,851 163,918
Other 5,426 (6,545)
Balance, end of period $ 5,726,033 $ 5,913,965
Weighted-average crediting rate 3.03% 2.66%
Net amount at risk (a) $ 268,085 $ 266,438
Cash surrender value 5,385,577 5,571,171
Fixed Index Annuities    
Policyholder Account Balance [Roll Forward]    
Balance, beginning of period 55,453,972 53,826,234
Issuances 1,866,523 7,555,709
Premiums received 17,116 152,532
Policy charges (123,631) (217,523)
Surrenders and withdrawals (1,965,003) (6,122,084)
Benefit payments (232,754) (836,507)
Interest credited 444,399 1,096,493
Other 1,099 (882)
Balance, end of period $ 55,461,721 $ 55,453,972
Weighted-average crediting rate 3.22% 2.03%
Net amount at risk (a) $ 11,725,220 $ 11,721,734
Cash surrender value $ 50,946,469 $ 50,983,033