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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross $ 6,512 $ 6,115    
ACL (126) (117) $ (111) $ (109)
Premiums receivable and agents' balances, net of ACL 6,386 5,998    
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 6,027 5,624    
ACL (105) (97) (91) (89)
Receivables for Loss Sensitive Business        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 485 491    
ACL (21) (20) $ (20) $ (20)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 95 97    
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 56 57    
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 190 193    
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross 95 94    
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating        
Financing Receivable, Credit Quality Indicator [Line Items]        
Premiums Receivable, Gross $ 49 $ 50