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Reinsurance and Indemnification - North Carolina Reinsurance Facility (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Retention Policy [Line Items]        
Insurance premiums $ 44,039   $ 38,167 $ 37,221
North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Funds deficit in member's equity   $ 67    
Net income   58    
Insurance premiums   1,110    
Paid 51      
Recoverables $ 228      
Private Passenger Auto Risk Recoupment | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Insurance premiums   244    
Member Loss Recoupments | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Insurance premiums   $ 127