v3.26.3
Acquisitions and Dispositions (Allocation of Acquisition Costs) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Business Combination [Line Items]        
Cash $ 318 $ 254    
Estimated fair value of deferred/contingent purchase consideration 90 68    
Fair value of previously-held equity method investment   15    
Total consideration 550 337    
Allocation of purchase price:        
Goodwill 24,613 $ 23,949 $ 24,337 $ 23,306
Current Fiscal Period Acquisitions        
Business Combination [Line Items]        
Cash 318      
Estimated fair value of deferred/contingent purchase consideration 90      
Fair value of previously-held equity method investment 142      
Total consideration 550      
Allocation of purchase price:        
Cash and cash equivalents 37      
Cash and cash equivalents held in a fiduciary capacity 18      
Net receivables 36      
Goodwill 364      
Other intangible assets 192      
Fixed assets, net 1      
Other assets 2      
Total assets acquired 650      
Current liabilities 46      
Fiduciary liabilities 18      
Other liabilities 36      
Total liabilities assumed 100      
Net assets acquired $ 550