v3.26.1
Basis of Presentation (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 07, 2026
USD ($)
$ / shares
shares
Feb. 17, 2026
USD ($)
$ / shares
shares
Feb. 06, 2026
USD ($)
Dec. 31, 2028
Dec. 31, 2027
Dec. 31, 2026
Jun. 30, 2026
USD ($)
country
Dec. 31, 2025
USD ($)
Schedule of Equity Method Investments [Line Items]                
Number of countries in which the entity operates | country             200  
Goodwill             $ 3,422 $ 3,435
Shares sold (in shares) | shares 25.5 24.7            
Per share purchase price (in dollars per share) | $ / shares $ 27.90 $ 30.42            
Aggregate proceeds $ 710 $ 750            
Convex Group Limited                
Schedule of Equity Method Investments [Line Items]                
Ownership (as a percent)     35.00%          
Consideration for equity method ownership     $ 2,100          
Intangible assets and other     520          
Goodwill     $ 440          
Convex Group Limited | Forecast                
Schedule of Equity Method Investments [Line Items]                
Reinsurance percentage       12.50% 10.00% 7.50%    
Onex Corporation                
Schedule of Equity Method Investments [Line Items]                
Ownership (as a percent)     9.90%          
Consideration for equity method ownership     $ 642