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Significant Accounting Policies (Schedule of Long-Duration Contracts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, liability for future policy benefits $ 318,677 $ 402,305  
Liability for future policy benefits, adjustment 292,334 318,677 $ 402,305
Ending balance, liability for future policy benefits 292,334 318,677 402,305
Beginning balance, market risk benefits 2,225,621    
Market risk benefits, after increase (decrease) from instrument-specific credit risk 2,206,392 2,225,621  
Ending balance, market risk benefits 2,206,392 2,225,621  
Deferred Policy Acquisition Costs      
Beginning balance, deferred policy acquisition costs 2,773,643 [1] 3,062,204  
Deferred policy acquisition costs 2,933,304 2,773,643 [1] 3,062,204
Ending balance, deferred policy acquisition costs 2,933,304 2,773,643 [1] 3,062,204
Deferred Sales Inducements      
Beginning balance, deferred sales inducement costs 2,045,683 [1] 2,119,961  
Deferred sales inducements 2,257,064 2,045,683 [1] 2,119,961
Ending balance, deferred sales inducement costs $ 2,257,064 $ 2,045,683 [1] 2,119,961
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, liability for future policy benefits     408,750
Liability for future policy benefits, adjustment      
Market Risk Benefit Liability      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     2,225,484
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Ceded Market Risk Benefit (a)      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     89,338
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Fixed Index Annuities and Fixed Rate Annuities      
Deferred Policy Acquisition Costs      
Beginning balance, deferred policy acquisition costs     3,408,505
Deferred policy acquisition costs      
Deferred Sales Inducements      
Beginning balance, deferred sales inducement costs     2,216,685
Deferred sales inducements      
As Reported | Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, liability for future policy benefits     337,467
Liability for future policy benefits, adjustment      
As Reported | Market Risk Benefit Liability      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     2,547,231
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
As Reported | Ceded Market Risk Benefit (a)      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     62,108
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
As Reported | Fixed Index Annuities and Fixed Rate Annuities      
Deferred Policy Acquisition Costs      
Beginning balance, deferred policy acquisition costs     2,225,199
Deferred policy acquisition costs      
Deferred Sales Inducements      
Beginning balance, deferred sales inducement costs     1,448,375
Deferred sales inducements      
Adjustment to opening retained earnings for expected future policy benefits | Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, liability for future policy benefits     2,566
Liability for future policy benefits, adjustment      
Adjustment for the effect of remeasurement of liability at current single A rate | Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, liability for future policy benefits     68,717
Liability for future policy benefits, adjustment      
Adjustment for the removal of shadow adjustments | Market Risk Benefit Liability      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     (584,636)
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Adjustment for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date | Market Risk Benefit Liability      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     229,108
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Adjustment for the remaining difference between previous carrying amount and fair value measurement for the MRB, exclusive of the instrument specific credit risk | Market Risk Benefit Liability      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     33,781
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Adjustment for the remaining difference between previous carrying amount and fair value measurement for the MRB, exclusive of the instrument specific credit risk | Ceded Market Risk Benefit (a)      
Liability for Future Policy Benefits for Payout Annuity With Life Contingency      
Beginning balance, market risk benefits     27,230
Market risk benefits, after increase (decrease) from instrument-specific credit risk      
Adjustments for the removal of shadow adjustments | Fixed Index Annuities and Fixed Rate Annuities      
Deferred Policy Acquisition Costs      
Beginning balance, deferred policy acquisition costs     1,183,306
Deferred policy acquisition costs      
Deferred Sales Inducements      
Beginning balance, deferred sales inducement costs     $ 768,310
Deferred sales inducements      
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.