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Goodwill and Other Intangibles - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]      
Changes in the goodwill $ 0    
Goodwill 327,000,000   $ 327,000,000
Amortizable intangible assets related to property and casualty insurance acquisitions 184,000,000   189,000,000
Accumulated amortization 80,000,000   $ 75,000,000
Amortization of intangible assets $ 5,000,000 $ 5,000,000