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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost $ 1,983 $ 2,041
Debt Securities, Available-for-sale, Allowance for Credit Loss 1 0
Premium Receivable, Allowance for Credit Loss $ 5 $ 5
Preferred stock, par value $ 0.01  
Preferred stock, shares authorized 20,000,000  
Preferred Stock, Shares Issued 0  
Common stock, par value $ 0.01  
Common stock, shares authorized 130,000,000  
Common stock, shares issued 46,659,019 46,658,990
Common stock, shares outstanding 45,321,745  
Equity investments in pooled funds [Member]    
Other Investment Not Readily Marketable, Fair Value $ 545 $ 556
Variable Interest Entity, Primary Beneficiary [Member]    
Long-term debt $ 2,869 $ 2,788