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Acquisition of Business - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 03, 2023
Sep. 30, 2024
Sep. 30, 2023
Business Acquisition [Line Items]      
Payments to acquire subsidiaries   $ 0 $ 234
Crop Risk Services      
Business Acquisition [Line Items]      
Payments to acquire subsidiaries $ 234    
Net tangible assets acquired, at fair value 24    
Acquisition expenses incurred 3    
Goodwill recorded 85    
Amount of goodwill expected to be tax deductible 79    
Crop Risk Services | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets acquired 124    
Finite-lived intangible assets useful life   14 years  
Crop Risk Services | Crop year 2022      
Business Acquisition [Line Items]      
Gross written premiums $ 1,200