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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 18, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 29, 2020
Jun. 19, 2019
Condensed Financial Information of Registrant            
Interest paid on debt   $ 311 $ 312 $ 330    
Allstate Corporation            
Condensed Financial Information of Registrant            
Notes due to subsidiaries   1,250 1,000      
Repayment of notes due to subsidiaries   1,000 1,250 250    
Interest paid on debt   $ 311 $ 312 $ 330    
Kennett Capital Inc | Subsidiaries | Allstate Corporation            
Condensed Financial Information of Registrant            
Notes due to subsidiaries $ 1,000       $ 250 $ 1,000
Note stated interest rate (as a percent) 0.43%       0.33% 2.63%
Repayment of notes due to subsidiaries $ 1,000