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Goodwill and Intangible Assets - Analysis of goodwill and intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill      
Goodwill, beginning of year $ 571 $ 345  
Goodwill, acquisitions 30 246  
Goodwill, foreign currency translation adjustment 6 (20) [1]  
Goodwill, end of year 607 571 $ 345
Intangible assets (indefinite life)      
Intangible assets with an indefinite life, beginning of year 79 70  
Intangible assets with an indefinite life, acquisitions 0 9  
Intangible assets with an indefinite life, foreign currency translation adjustment 2 0 [1]  
Intangible assets with an indefinite life, end of year 81 79 70
Intangible assets (finite life)      
Intangible assets with a finite life, beginning of year 701 316  
Intangible assets with a finite life, acquisitions 2 637  
Intangible assets with a finite life, amortization (193) (235) (95)
Intangible assets with a finite life, foreign currency translation adjustment 24 (17) [1]  
Intangible assets with a finite life, end of year 534 701 316
Total      
Goodwill and intangible assets, beginning of year 1,351 731  
Goodwill and intangible assets, acquisitions 32 892  
Goodwill and intangible assets, foreign currency movements and other adjustments 32 (37) [1]  
Goodwill and intangible assets, end of year 1,222 1,351 731
Reconciliation of gross to net      
Gross balance 2,412 2,380  
Accumulated amortization (1,171) (994)  
Foreign currency movements and other adjustments (19) (35)  
Goodwill and intangible assets 1,222 1,351 $ 731
Goodwill      
Total      
Goodwill and intangible assets, beginning of year 571    
Goodwill and intangible assets, end of year 607 571  
Reconciliation of gross to net      
Gross balance 606 576  
Foreign currency movements and other adjustments 1 (5)  
Goodwill and intangible assets 607 $ 571  
Intangible assets with an indefinite life      
Total      
Goodwill and intangible assets, end of year 81    
Reconciliation of gross to net      
Gross balance 80    
Foreign currency movements and other adjustments 1    
Goodwill and intangible assets 81    
Intangible assets with a finite life      
Total      
Goodwill and intangible assets, end of year 534    
Reconciliation of gross to net      
Gross balance 1,726    
Accumulated amortization (1,171)    
Foreign currency movements and other adjustments (21)    
Goodwill and intangible assets $ 534    
[1] Amount primarily related to the sale of Castel Underwriting AgenciesLimited