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Investments (Narrative) (Details)
$ in Billions
3 Months Ended
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
security
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 98.00%   98.00%
Number of securities in unrealized loss position | security 4,175   4,510
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 97.00%   98.00%
Proceeds from sales of available for sale fixed maturity securities $ 2.3 $ 1.2  
Principal repayments, calls and tenders for available for sale fixed maturity securities $ 0.9 $ 0.6