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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 18, 2019
Apr. 11, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 19, 2019
Dec. 18, 2018
Oct. 11, 2018
Condensed Financial Information of Registrant                
Interest paid on debt     $ 312 $ 330 $ 332      
Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries     1,000 1,250        
Repayment of notes due to subsidiaries     1,250 250 50      
Interest paid on debt     $ 312 $ 330 $ 331      
Kennett Capital Inc | Subsidiaries | Allstate Corporation                
Condensed Financial Information of Registrant                
Notes due to subsidiaries           $ 1,000 $ 1,000 $ 250
Note stated interest rate (as a percent)           2.63% 3.03% 2.49%
Repayment of notes due to subsidiaries $ 1,000 $ 250