v3.25.2
Business Combinations - Narrative (Details)
$ in Millions
 6 Months Ended
Jul. 22, 2025
USD ($)
Jul. 01, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 03, 2025
USD ($)
Feb. 18, 2025
USD ($)
Feb. 03, 2025
USD ($)
May 24, 2024
USD ($)
May 01, 2024
USD ($)
Mar. 09, 2023
USD ($)
Jun. 30, 2025
USD ($)
tower_site
Dec. 31, 2024
USD ($)
Dec. 20, 2024
Business Combination [Line Items]                        
Goodwill     $ 13,460             $ 13,460 $ 13,005  
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]                        
Total consideration transferred               $ 1,141        
Business combination contingent consideration liability, other long-term liabilities     236             236 202  
Business combination, liability, post-acquisition services     $ 137             $ 137 $ 80  
Goodwill               777        
Goodwill expected to be tax deductible               121        
Total liabilities assumed               $ 506        
UScellular Wireless Assets Operations | Purchase Agreement                        
Business Combination [Line Items]                        
Payments for asset acquisition             $ 4,400          
Asset acquisition, maximum transferred liabilities incurred             $ 2,000          
Lessee leasing arrangements, operating leases, term of contract (years)     15 years             15 years    
Number of towers retained | tower_site                   2,100    
Number of towers to be extended tenancy term | tower_site                   600    
Estimated incremental future minimum lease payments     $ 1,400             $ 1,400    
UScellular Wireless Assets Operations | Purchase Agreement | Subsequent Event                        
Business Combination [Line Items]                        
Lessee leasing arrangements, operating leases, term of contract (years)   15 years                    
Estimated incremental future minimum lease payments   $ 1,400                    
Business acquisition, cash transferred   $ 1,700                    
Farmers Cellular Telephone Company Acquisition | Purchase Agreement | Subsequent Event                        
Business Combination [Line Items]                        
Business acquisition, cash transferred $ 170                      
Vistar Media Inc.                        
Business Combination [Line Items]                        
Business acquisition, outstanding (percent)                       100.00%
Total consideration transferred           $ 619            
Goodwill           345            
Total consideration transferred, including settlements of preexisting relationships           621            
Total liabilities assumed           193            
Vistar Media Inc. | Customer Relationships                        
Business Combination [Line Items]                        
Finite-lived, fair value           201            
Vistar Media Inc. | Tradenames                        
Business Combination [Line Items]                        
Finite-lived, fair value           8            
Vistar Media Inc. | Other Intangible Assets                        
Business Combination [Line Items]                        
Finite-lived, fair value           $ 55            
Vistar Media Inc. | Merger and Unit Purchase Agreement, Amendment No. 1 | Customer Relationships                        
Business Combination [Line Items]                        
Weighted average useful life           9 years            
Vistar Media Inc. | Merger and Unit Purchase Agreement, Amendment No. 1 | Tradenames                        
Business Combination [Line Items]                        
Weighted average useful life           4 years            
Vistar Media Inc. | Merger and Unit Purchase Agreement, Amendment No. 1 | Other Intangible Assets                        
Business Combination [Line Items]                        
Weighted average useful life           4 years            
Blis Holdco Limited                        
Business Combination [Line Items]                        
Business acquisition, outstanding (percent)         100.00%              
Total consideration transferred         $ 175              
Business acquisition, cash transferred       $ 180                
Total assets acquired, including goodwill         280              
Total liabilities assumed         105              
Provisionally assigned value of goodwill         $ 104