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Acquisitions - Acquisition of AMS Group (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Aug. 01, 2018
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2019
Business Acquisition [Line Items]        
Goodwill acquired   $ 42    
Assurant Mortgage Solutions Group        
Business Acquisition [Line Items]        
Intangible assets acquired     $ 24  
Goodwill acquired     13  
Xome Holdings LLC | Assurant Mortgage Solutions Group        
Business Acquisition [Line Items]        
Cash consideration $ 38      
Contingent consideration     $ 15 $ 4
Estimated consideration 53      
Intangible assets acquired 24      
Goodwill acquired $ 13      
Change in contingent consideration   $ 11