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Derivative Instruments (Notional and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative assets $ 196,656 $ 1,277,480
Designated as Hedging Instrument | Interest Rate Swaps | Fair Value Hedging    
Derivatives, Fair Value [Line Items]    
Notional amount 408,369 0
Derivative assets 32,620 0
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount 39,390,087 40,093,373
Derivative assets 164,036 1,277,480
Derivative liabilities 4,736,584 7,962,599
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Notional amount 39,388,067 40,091,353
Derivative assets 162,869 1,276,574
Not Designated as Hedging Instrument | Warrants    
Derivatives, Fair Value [Line Items]    
Notional amount 2,020 2,020
Derivative assets 1,167 906
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,257,042 7,964,961
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (520,458) $ (2,362)