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Acquisitions - Acquisition of AMS Group (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 01, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill acquired   $ 31  
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   4 $ 15
Estimated consideration 53    
Intangible assets acquired 24    
Goodwill acquired $ 13    
Change in contingent consideration   $ 11