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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, 2022
Dec. 31, 2021
Dec. 31, 2020
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      
Decrease in unearned premiums $ (2,541) $ (1,618) $ (598)
Unearned premium, year one 1,640    
Unearned premium, year two 1,310    
Unearned premium, thereafter 1,790    
Present value of future profits 13 24  
Amortization expense of present value of future profits 11 323 $ 14
Property and casualty insurance premiums | Protection Services      
Deferred Policy Acquisition and Sales Inducement Costs      
Decrease in unearned premiums $ 1,460 $ 1,280  
Minimum | Personal Lines      
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    
Minimum | Protection Plans and Other Contracts      
Deferred Policy Acquisition and Sales Inducement Costs      
Period for amortization of DAC for property-liability insurance 1 year    
Maximum      
Securities loaned      
Securities lending transactions length 30 days    
Maximum | Personal Lines      
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    
Maximum | Protection Plans and Other Contracts      
Deferred Policy Acquisition and Sales Inducement Costs      
Period for amortization of DAC for property-liability insurance 5 years