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Derivative Instruments (Carrying Amount and Cumulative Fair Value Hedging Adjustments) (Details) - Fixed Maturity Securities, Available For Sale - Fair Value Hedging - Designated as Hedging Instrument - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Derivative [Line Items]    
Amortized cost of hedged item $ 3,609,120 $ 0
Cumulative amount of fair value basis adjustment gain (loss) $ (33,093) $ 0