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Acquisition and Sale of Businesses - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Business Acquisition [Line Items]        
Payments to acquire subsidiaries     $ 10 $ 0
Verikai, Inc.        
Business Acquisition [Line Items]        
Payments to acquire subsidiaries $ 120      
Contingent consideration possible to be paid, maximum 50      
Expenses related to acquisition of subsidiary $ 1      
Insurance Agency        
Business Acquisition [Line Items]        
Payments to acquire subsidiaries   $ 10    
Business combination, consideration transferred   $ 12