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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Property and casualty insurance premiums earned        
Reinsurance        
Property and casualty insurance premiums earned $ (588) $ (495) $ (1,145) $ (941)
Accident and health insurance premiums and contract charges        
Reinsurance        
Accident and health insurance premiums and contract charges $ (11) $ (10) $ (21) $ (19)