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Investment Information - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
lots
Dec. 31, 2022
USD ($)
lots
Continuous unrealized loss, qualitative disclosures:    
Number of positions in an unrealized loss position (lots) | lots 7,100 9,810
Total number of positions (lots) | lots 15,720 12,590
Largest single loss | $ $ 6 $ 7
Equity securities, at fair value | $ $ 1,186 $ 860
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]    
Investments, time lag for reporting - low end of range 1 month  
Investments, time lag for reporting - high end of range 3 months