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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, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 10, 2019
Business Acquisitions [Line Items]            
Payments to acquire subsidiaries     $ 0 $ 36 $ 0  
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%
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     $ 3      
Contingent consideration term       4 years    
Finite-lived intangible assets acquired 25          
Finite-lived intangible asset useful life       9 years    
Goodwill acquired during period $ 8          
Equity securities | Warrant | Maximum | Atlas Financial Holdings - Paratransit Business            
Business Acquisitions [Line Items]            
Fair value of asset on date received           $ 1