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Derivative Instruments (Notional and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative assets $ 733,784 $ 431,727 [1]
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedging    
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 40,993,916 38,929,554
Derivative assets 733,784 398,958
Derivative liabilities 4,078,231 4,378,981
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Notional amount 40,993,916 38,927,534
Derivative assets 733,784 397,789
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 4,604,191 4,820,845
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (525,960) $ (441,864)
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.