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Related Party Transactions Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
tranche
Dec. 31, 2023
USD ($)
Related Party Transaction [Line Items]      
Other assets $ 2,760 $ 2,591  
Fixed maturity securities 43,402 41,111  
Net investment income 2,557 2,497 $ 2,264
Net earned premiums 10,900 10,211 9,480
Commercial mortgage-backed      
Related Party Transaction [Line Items]      
Amount of securitization   305  
Related Party      
Related Party Transaction [Line Items]      
Other liabilities, current 33 30  
Taxes payable 20    
Other assets   17  
Related Party | Fees and expenses of investment facilities and services      
Related Party Transaction [Line Items]      
Related party transaction, amounts of transaction 64 60 55
Related Party | Corporate services and related travel expenses      
Related Party Transaction [Line Items]      
Related party transaction, amounts of transaction 1 1  
Related Party | Loews      
Related Party Transaction [Line Items]      
Net earned premiums 3 2 $ 2
Affiliated Entity      
Related Party Transaction [Line Items]      
Fixed maturity securities 51 50  
Affiliated Entity | Maximum      
Related Party Transaction [Line Items]      
Net investment income $ 3 1  
Affiliated Entity | Commercial mortgage-backed      
Related Party Transaction [Line Items]      
Related party transaction, amounts of transaction   $ 50  
Number of investment tranches | tranche   3