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Reinsurance and Indemnification - North carolina reinsurance facility (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Reinsurance Retention Policy [Line Items]        
Insurance premiums $ 47,737   $ 44,039 $ 38,167
North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Funds deficit in member's equity   $ 148    
Net income   81    
Insurance premiums   1,100    
Paid and due from reinsurers and indemnitors 52      
Recoverables $ 240      
Reinsurance Contract [Axis]: Member Loss Recoupments | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Insurance premiums   37    
Reinsurance Contract [Axis]: Private Passenger Auto Risk Recoupment | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Insurance premiums   $ 302