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Business and Summary of Significant Accounting Policies - Contract Holder Funds, Future Policy Benefits and Secured Trust Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]    
NPR, capped percentage 100.00%  
Market risk benefit, attributed fee ratio capped percentage 100.00%  
Secured trust deposits $ 731 $ 862