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Reinsurance and Indemnification - Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Premiums Earned and Accident and Health Insurance Premiums and Contract Charges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Property and casualty insurance premiums earned    
Reinsurance    
Property and casualty insurance premiums earned $ (605) $ (543)
Accident and health insurance premiums and contract charges    
Reinsurance    
Accident and health insurance premiums and contract charges $ (132) $ (13)