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Acquisition of Businesses - Narrative (Details) - Crop Risk Services - USD ($)
$ in Millions
Jul. 03, 2023
Mar. 31, 2024
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  
Customer relationships    
Business Acquisition [Line Items]    
Intangible assets acquired 124  
Finite-lived intangible assets useful life   14 years
Crop year 2022    
Business Acquisition [Line Items]    
Gross written premiums $ 1,200