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Acquisitions and Sale of Businesses - Narrative on acquisitions of subsidiaries (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 06, 2021
Nov. 30, 2021
Nov. 30, 2020
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries         $ 10 $ 123 $ 3  
Expenses related to acquisition of subsidiary $ 1              
Finite-lived intangible assets useful life           10 years    
Atlas Financial Holdings - Paratransit Business                
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries   $ 3 $ 3          
Verikai, Inc.                
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries 120              
Contingent consideration possible to be paid, maximum           $ 50    
Intangible assets acquired 76              
Goodwill acquired during period 70         $ 70    
Total purchase price $ 143              
Neon Capital Limited | Neon Capital Limited Executives                
Business Acquisitions [Line Items]                
Percent of noncontrolling interest acquired from former and current Neon executives               100.00%
Insurance Agency                
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries       $ 10        
Total purchase price       $ 12