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Other Intangible Assets (Summary of Other Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Other Intangible Assets [Abstract]    
Indefinite-lived intangible assets: $ 75 $ 76
Total other intangible assets 85 86
Accumulated Amortization 8 8
Syndicate capacity    
Schedule of Other Intangible Assets [Abstract]    
Indefinite-lived intangible assets: 44 45
Agency force    
Schedule of Other Intangible Assets [Abstract]    
Indefinite-lived intangible assets: 16 16
Insurance licenses    
Schedule of Other Intangible Assets [Abstract]    
Indefinite-lived intangible assets: $ 15 $ 15
Distribution channel    
Schedule of Other Intangible Assets [Abstract]    
Economic Useful Life 15 years 15 years
Finite-lived intangible assets: $ 10 $ 10
Accumulated Amortization $ 8 $ 8