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Acquisitions - Summary of allocation of purchase price (Details) - US MidCorp and Entertainment - USD ($)
$ in Millions
 3 Months Ended
Aug. 01, 2024
Jun. 30, 2025
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  
Net assets acquired 174  
Goodwill 276  
Deferred tax asset, goodwill and intangibles 555  
Net deferred tax asset, loss reserves and unearned premium 24  
Goodwill, measurement period adjustment   $ 10
Reserves For Losses And Loss Adjustment Expenses    
Liabilities Acquired    
Loss reserves, fair value adjustment 130  
Distribution relationships    
Assets Acquired    
Intangible assets $ 220  
Useful life 10 years  
Value of business acquired    
Assets Acquired    
Intangible assets $ 165  
Other intangible assets    
Assets Acquired    
Intangible assets [1] $ 180  
Minimum | Value of business acquired    
Assets Acquired    
Useful life 1 year  
Minimum | Other intangible assets    
Assets Acquired    
Useful life 5 years  
Maximum | Value of business acquired    
Assets Acquired    
Useful life 2 years  
Maximum | Other intangible assets    
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.