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Acquisitions and Sale of Businesses - Narrative on acquisitions of subsidiaries (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 06, 2021
Nov. 30, 2021
Nov. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Business Acquisitions [Line Items]              
Payments to acquire subsidiaries       $ 123 $ 3 $ 0  
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      
Neon Capital Limited | Neon Capital Limited Executives              
Business Acquisitions [Line Items]              
Percent of noncontrolling interest acquired from former and current Neon executives             100.00%