v3.26.1
Business Combinations - Narrative (Details)
$ in Millions
Aug. 05, 2025
USD ($)
Aug. 01, 2025
USD ($)
Jul. 22, 2025
USD ($)
agreement
Jun. 30, 2025
USD ($)
Mar. 03, 2025
USD ($)
Feb. 18, 2025
USD ($)
Feb. 03, 2025
USD ($)
May 24, 2024
USD ($)
Mar. 09, 2023
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 20, 2024
Business Combination [Line Items]                        
Goodwill                   $ 13,664 $ 13,678  
Ka Ena Corporation | Merger And Unit Purchase Agreement                        
Business Combination [Line Items]                        
Business acquisition, outstanding (percent)                 100.00%      
Total consideration transferred       $ 1,350         $ 1,350      
Business acquisition, cash acquired (percent)                 39.00%      
Business acquisition, common shares acquired (percent)                 61.00%      
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1                        
Business Combination [Line Items]                        
Additional upfront payment to be paid       420                
Business combination, potential earnout payment       251                
Business combination, potential earnout payment for services       $ 169                
Liabilities for deferred consideration                   244 242  
Liabilities for post-acquisition                   $ 164 $ 157  
UScellular Wireless Assets Operations                        
Business Combination [Line Items]                        
Short-term debt assumed for financing of property and equipment $ 1,700                      
Short-term debt assumed for financing of property and equipment at fair value   $ 1,700                    
Goodwill   209                    
Goodwill expected to be tax deductible   32                    
UScellular Wireless Assets Operations | Purchase Agreement                        
Business Combination [Line Items]                        
Payments for asset acquisition               $ 4,400        
Asset acquisition, maximum transferred liabilities incurred               $ 2,000        
Business acquisition, cash transferred   $ 2,800                    
Farmers Cellular Telephone Company Acquisition | Purchase Agreement                        
Business Combination [Line Items]                        
Number of separate asset purchase agreements | agreement     3                  
Business acquisition, cash transferred     $ 175                  
Vistar Media Inc.                        
Business Combination [Line Items]                        
Business acquisition, outstanding (percent)                       100.00%
Total consideration transferred             $ 618          
Goodwill             341          
Total consideration transferred, including settlements of preexisting relationships             621          
Total liabilities assumed             $ 190          
Blis Holdco Limited                        
Business Combination [Line Items]                        
Business acquisition, outstanding (percent)           100.00%            
Total consideration transferred           $ 174            
Business acquisition, cash transferred         $ 180              
Goodwill           103            
Total assets acquired, including goodwill           263            
Total liabilities assumed           $ 89