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Acquisition (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 01, 2024
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liabilities Acquired          
Goodwill     $ 607 $ 571 $ 345
Deferred tax asset, goodwill and intangibles     $ 835 $ 1,034  
US MidCorp and Entertainment          
Purchase price          
Business acquisition, cash paid $ 450        
Assets Acquired          
Cash and investments, at fair value 2,332        
Premiums receivable, net of commissions 224        
Other assets acquired 175        
Total assets acquired 3,296        
Liabilities Acquired          
Reserves for losses and loss adjustment expenses 2,468        
Unearned premiums 636        
Other liabilities acquired 18        
Total liabilities acquired 3,122        
Identifiable net assets acquired 174        
Goodwill 276        
Deferred tax asset, goodwill and intangibles 555        
Net deferred tax asset, loss reserves and unearned premiums 24        
Goodwill, measurement period adjustment   $ 10      
US MidCorp and Entertainment | Reserves For Losses And Loss Adjustment Expenses          
Liabilities Acquired          
Loss reserves, fair value adjustment 130        
US MidCorp and Entertainment | Distribution relationships          
Assets Acquired          
Intangible assets $ 220        
Useful life 10 years        
US MidCorp and Entertainment | Value of business acquired          
Assets Acquired          
Intangible assets $ 165        
US MidCorp and Entertainment | Value of business acquired | Minimum          
Assets Acquired          
Useful life 1 year        
US MidCorp and Entertainment | Value of business acquired | Maximum          
Assets Acquired          
Useful life 2 years        
US MidCorp and Entertainment | Other intangible assets          
Assets Acquired          
Intangible assets [1] $ 180        
US MidCorp and Entertainment | Other intangible assets | Minimum          
Assets Acquired          
Useful life 5 years        
US MidCorp and Entertainment | Other intangible assets | Maximum          
Assets Acquired          
Useful life 7 years        
[1] Includes $130 million related to the net fair value adjustment to reserves for loss and loss adjustment expenses on August 1, 2024.