v3.26.1
Acquisitions and Divestitures (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Business Acquisition      
Goodwill $ 14,001   $ 13,880
Proceeds from divestitures of businesses and other assets, net of cash divested 77 $ 103  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Business Acquisition      
Proceeds from divestitures of businesses and other assets, net of cash divested 77 $ 103  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | West Tier [Member]      
Business Acquisition      
(Gain) loss from divestitures, asset impairments and unusual items, net 34    
Gain on business divestiture $ 34    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] Gain Loss From Divestitures Asset Impairments And Unusual Items    
Aggregate smaller acquisitions [Member]      
Business Acquisition      
Total consideration, net of cash acquired $ 235    
Business acquisitions common stock issuance 144    
Business acquisitions cash payments 85    
Other consideration 6    
Property and equipment 27    
Other intangible assets 75    
Goodwill 138    
Contingent liability payments $ 13