v3.24.4
Business Combinations - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 20, 2024
USD ($)
May 24, 2024
USD ($)
May 01, 2024
USD ($)
shares
Apr. 30, 2024
USD ($)
Mar. 09, 2023
USD ($)
Jun. 30, 2025
USD ($)
tower_site
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Business Acquisition [Line Items]                
Estimated incremental future minimum lease payments             $ 24 $ 24
Ka Ena Corporation                
Business Acquisition [Line Items]                
Preliminary goodwill from the Ka’ena Acquisition in 2024     $ 771         771
Ka Ena Corporation | Merger And Unit Purchase Agreement                
Business Acquisition [Line Items]                
Business acquisition, outstanding (percent)         100.00%      
Total consideration transferred         $ 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 Acquisition [Line Items]                
Total consideration transferred     1,141          
Upfront payment transferred     $ 420          
Upfront payment, number of common shares transferred (in shares) | shares     3,264,952          
Upfront payment, transferred shares value       $ 536        
Fair value of upfront payment, net     $ 956          
Fair value of deferred consideration     27          
Upfront Payment, customary adjustments             17  
Additional upfront payment to be paid     420          
Business combination, potential earnout payment     251          
Business combination, contingent consideration liability     191          
Business combination, potential earnout payment for services     169          
Business combination contingent consideration liability, other long-term liabilities             202 202
Business combination, liability, post-acquisition services             $ 80 $ 80
Goodwill expected to be tax deductible     90          
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Customer Relationships                
Business Acquisition [Line Items]                
Finite-lived, fair value     $ 545          
Weighted average useful life     6 years          
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Tradenames                
Business Acquisition [Line Items]                
Finite-lived, fair value     $ 70          
Weighted average useful life     8 years          
Ka Ena Corporation | Merger and Unit Purchase Agreement, Amendment No. 1 | Other Intangible Assets                
Business Acquisition [Line Items]                
Finite-lived, fair value     $ 125          
Weighted average useful life     4 years          
UScellular Wireless Assets Operations | Purchase Agreement                
Business Acquisition [Line Items]                
Payments for asset acquisition   $ 4,400            
Asset acquisition, maximum transferred liabilities incurred   $ 2,000            
UScellular Wireless Assets Operations | Purchase Agreement | Forecast                
Business Acquisition [Line Items]                
Lease space agreement term (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    
Vistar Media Inc.                
Business Acquisition [Line Items]                
Business acquisition, outstanding (percent) 100.00%              
Total consideration transferred $ 625