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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($)
12 Months Ended
Apr. 17, 2018
Dec. 20, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 18, 2018
Oct. 11, 2018
Dec. 11, 2017
Condensed Financial Information of Registrant                
Interest paid on debt     $ 330,000,000 $ 332,000,000 $ 287,000,000      
Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries     1,250,000,000 250,000,000        
Repayment of notes due to subsidiaries     250,000,000 50,000,000 0      
Interest paid on debt     $ 330,000,000 $ 331,000,000 $ 287,000,000      
Kennett Capital Inc | Subsidiaries | Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries           $ 1,000,000,000 $ 250,000,000  
Note stated interest rate (as a percent)           3.03% 2.49%  
Kennett Capital Inc | Notes Due 2018 at 1.59 Percent, Note One | Subsidiaries | Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries               $ 125,000,000
Note stated interest rate (as a percent)               1.59%
Repayments of debt $ 125,000,000              
Allstate Non-Insurance Holdings Inc | Notes Due 2018 at 1.59 Percent, Note Two | Subsidiaries | Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries               $ 175,000,000
Repayment of notes due to subsidiaries   $ 50,000,000            
Repayments of debt $ 125,000,000