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Schedule II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 17, 2022
Jun. 18, 2021
Apr. 05, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 01, 2021
Dec. 29, 2020
Jun. 18, 2020
Condensed Financial Information of Registrant                  
Interest paid on debt       $ 323 $ 321 $ 311      
Allstate Corporation                  
Condensed Financial Information of Registrant                  
Notes due to subsidiaries       1,000 1,000        
Repayment of notes due to subsidiaries       1,000 2,450 1,000      
Interest paid on debt       $ 323 $ 321 $ 311      
Kennett Capital Inc | Subsidiaries | Allstate Corporation                  
Condensed Financial Information of Registrant                  
Notes due to subsidiaries $ 1,000 $ 1,000         $ 200 $ 250 $ 1,000
Note stated interest rate (as a percent) 1.63% 0.20%         0.21% 0.33% 0.43%
Repayment of notes due to subsidiaries $ 1,000 $ 1,000 $ 250            
Kennett Capital Inc, Second Repayment | Subsidiaries | Allstate Corporation                  
Condensed Financial Information of Registrant                  
Repayment of notes due to subsidiaries     $ 200