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Derivative Instruments (Notional and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,207,288 $ 431,727 [1]
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps    
Derivatives, Fair Value [Line Items]    
Notional amount 0 408,369
Derivative assets 0 32,769
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount 41,547,731 38,929,554
Derivative assets 1,207,288 398,958
Derivative liabilities 4,925,118 4,378,981
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Notional amount 41,547,731 38,927,534
Derivative assets 1,207,288 397,789
Not Designated as Hedging Instrument | Warrants    
Derivatives, Fair Value [Line Items]    
Notional amount 0 2,020
Derivative assets 0 1,169
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,181,894 4,820,845
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (256,776) $ (441,864)
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.