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Acquisitions and Sale of Businesses - Narrative on acquisitions of subsidiaries (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2020
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 10, 2019
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries       $ 3 $ 0 $ 36    
Goodwill acquired during period     $ 8     $ 8    
Atlas Financial Holdings - Paratransit Business                
Business Acquisitions [Line Items]                
Gross written premiums eligible for renewal             $ 110  
Business acquisition, price as a percent of gross written premiums               15.00%
Payments to acquire subsidiaries $ 3              
Warrant term to acquire shares               5 years
Number of shares able to be acquired with the warrant               2.4
Business acquisition, percentage of entity acquired by warrants               19.90%
ABA Insurance Services                
Business Acquisitions [Line Items]                
Payments to acquire subsidiaries   $ 30            
Contingent consideration term           4 years    
Finite-lived intangible assets acquired   25            
Finite-lived intangible asset useful life           9 years    
Goodwill acquired during period   $ 8            
ABA Insurance Services | Maximum                
Business Acquisitions [Line Items]                
Contingent consideration     $ 3     $ 3    
Equity securities | Warrant | Atlas Financial Holdings - Paratransit Business                
Business Acquisitions [Line Items]                
Fair value of asset on date received               $ 1