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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 ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 15,949,000,000 $ 15,343,000,000  
Decrease in unearned premiums (598,000,000) (801,000,000) $ (915,000,000)
Unearned premium, year one 1,300,000,000    
Unearned premium, year two 861,000,000    
Unearned premium, thereafter 1,000,000,000.00    
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance (91,000,000)    
Increase in the provision for credit losses (223,000,000)    
Write-off of uncollectible premium installment receivable amounts 161,000,000    
Ending balance (153,000,000) (91,000,000)  
Present value of future profits 25,000,000 39,000,000  
Amortization expense of present value of future profits 14,000,000 6,000,000 $ 2,000,000
Allstate Protection      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums 12,772,000,000 12,567,000,000  
Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums 3,167,000,000 2,765,000,000  
Allstate Protection and Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Unearned premiums $ 15,939,000,000 15,332,000,000  
Minimum      
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts 15 years    
Maximum      
Securities loaned      
Securities lending transactions length 30 days    
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts 30 years    
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    
Interest-sensitive life insurance contract charges | Minimum      
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts 10 years    
Interest-sensitive life insurance contract charges | Maximum      
Premium Receivable, Allowance for Credit Loss [Roll Forward]      
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts 20 years    
Property and casualty insurance premiums | Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Decrease in unearned premiums $ 1,110,000,000 $ 996,000,000