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Acquisitions of Businesses - Narrative on acquisitions of subsidiaries (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 03, 2023
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Acquisitions [Line Items]            
Payments to acquire subsidiaries       $ 7 $ 9 $ 234
Radion Insurance Holdings, LLC            
Business Acquisitions [Line Items]            
Percent of subsidiary acquired   52.00%        
Payments to acquire subsidiaries   $ 7        
Realized gain on subsidiary from remeasurement   3        
Purchase of Radion   22   $ 22    
Radion Insurance Holdings, LLC | Technology-based intangible assets            
Business Acquisitions [Line Items]            
Intangible assets acquired   $ 5        
Insurance Agency 2024            
Business Acquisitions [Line Items]            
Payments to acquire subsidiaries     $ 5      
Business acquisition, consideration transferred     6      
Consulting Company            
Business Acquisitions [Line Items]            
Payments to acquire subsidiaries     $ 4      
Crop Risk Services            
Business Acquisitions [Line Items]            
Payments to acquire subsidiaries $ 234          
Purchase of Radion 85          
Net tangible assets acquired, at fair value 24          
Acquisition costs incurred 3          
Goodwill deductible for tax purposes 79          
Crop Risk Services | Customer relationships            
Business Acquisitions [Line Items]            
Intangible assets acquired 124          
Finite-lived intangible assets useful life       14 years    
Crop Risk Services | Crop Insurance Contract, Crop Year 2022            
Business Acquisitions [Line Items]            
Gross written premiums $ 1,200