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Acquisitions and Dispositions - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 17, 2021
USD ($)
Nov. 01, 2021
USD ($)
Oct. 01, 2021
USD ($)
state
Mar. 15, 2021
USD ($)
Feb. 03, 2021
USD ($)
Dec. 31, 2022
USD ($)
state
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 04, 2021
USD ($)
Business Acquisition [Line Items]                  
Goodwill           $ 3,502 $ 3,502    
Debt           7,964 7,976    
Present value of future profits           (13) (24)    
Loss on disposition of operations, net of tax           $ 0 4,031 $ 0  
Subordinated Debentures                  
Business Acquisition [Line Items]                  
Repayments of debt       $ 72 $ 100        
Note stated interest rate (as a percent)         7.625%        
Senior Notes                  
Business Acquisition [Line Items]                  
Note stated interest rate (as a percent)           6.75%      
Debt           $ 350      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company Of New York                  
Business Acquisition [Line Items]                  
Definitive agreement with Wilton Reassurance     $ 400            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company                  
Business Acquisition [Line Items]                  
Proceeds from affiliates   $ 4,000              
Pre-close dividend received   $ 1,250              
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ALNY And ALIC                  
Business Acquisition [Line Items]                  
Loss on disposition of operations, net of tax             4,090    
Distribution and customer relationships                  
Business Acquisition [Line Items]                  
Finite-Lived intangible asset, useful life           10 years      
Allstate Protection                  
Business Acquisition [Line Items]                  
Goodwill           $ 1,563 1,563    
Number of states in which entity operates | state           50      
Protection Services                  
Business Acquisition [Line Items]                  
Goodwill           $ 1,494 $ 1,494    
Allstate Health and Benefits                  
Business Acquisition [Line Items]                  
Number of states in which entity operates | state           50      
National General Holdings Corp.                  
Business Acquisition [Line Items]                  
Goodwill                 $ 1,038
Purchase accounting fair value adjustment           $ 26      
Fair value purchase accounting adjustments, increase in reserves           62      
Fair value purchase accounting adjustments, reduction in investments           9      
Fair value purchase accounting adjustments, increase in current and deferred tax liabilities           153      
Transaction costs           $ 22      
Intangible assets                 1,199
National General Holdings Corp. | Licenses                  
Business Acquisition [Line Items]                  
Intangible assets                 97
National General Holdings Corp. | Allstate Protection                  
Business Acquisition [Line Items]                  
Goodwill                 675
Present value of future profits                 (317)
National General Holdings Corp. | Protection Services                  
Business Acquisition [Line Items]                  
Goodwill                 20
National General Holdings Corp. | Allstate Health and Benefits                  
Business Acquisition [Line Items]                  
Goodwill                 $ 343
SafeAuto                  
Business Acquisition [Line Items]                  
Goodwill     $ 79            
Number of states in which entity operates | state     28            
Payments to acquire businesses     $ 267            
Intangible assets     31            
Value of business acquired     7            
Redemption of preferred stock $ 13                
SafeAuto | Distribution and customer relationships                  
Business Acquisition [Line Items]                  
Intangible assets     25            
SafeAuto | Licenses                  
Business Acquisition [Line Items]                  
Intangible assets     $ 6            
Minimum | National General Holdings Corp.                  
Business Acquisition [Line Items]                  
Finite-Lived intangible asset, useful life           6 months      
Maximum | National General Holdings Corp.                  
Business Acquisition [Line Items]                  
Finite-Lived intangible asset, useful life           12 months