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Summary of Significant Accounting Policies - Securities loaned and Recognition of premium revenues and contract charges, and related benefits and interest credited (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Securities loaned      
Cash collateral received as percentage of fair value of domestic securities loaned 102.00%    
Cash collateral received as a percent of fair value of foreign securities loaned 105.00%    
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums $ 19,844 $ 15,946  
Decrease in unearned premiums (1,618) (598) $ (801)
Unearned premium, year one 1,480    
Unearned premium, year two 1,070    
Unearned premium, thereafter 1,500    
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance (153) (91)  
Increase in the provision for credit losses (293) (223)  
Write-off of uncollectible premium installment receivable amounts 339 161  
Ending balance (107) (153) (91)
Present value of future profits 24 23  
Amortization expense of present value of future profits 323 14 $ 6
Allstate Protection      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums 15,762 12,772  
Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums 4,054 3,167  
Allstate Protection and Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums $ 19,816 15,939  
Maximum      
Securities loaned      
Securities lending transactions length 30 days    
Personal Lines | Minimum      
Deferred Policy Acquisition and Sales Inducement Costs      
Property and casualty insurance contract, terms 6 months    
Period for amortization of DAC for property-liability insurance 6 months    
Personal Lines | Maximum      
Deferred Policy Acquisition and Sales Inducement Costs      
Property and casualty insurance contract, terms 12 months    
Period for amortization of DAC for property-liability insurance 12 months    
Protection Plans and Other Contracts | Minimum      
Deferred Policy Acquisition and Sales Inducement Costs      
Period for amortization of DAC for property-liability insurance 1 year    
Protection Plans and Other Contracts | Maximum      
Deferred Policy Acquisition and Sales Inducement Costs      
Period for amortization of DAC for property-liability insurance 5 years    
Property and casualty insurance premiums | Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Decrease in unearned premiums $ 1,280 $ 1,110