v3.25.3
Goodwill, Spectrum License Transactions and Other Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 02, 2025
USD ($)
May 30, 2025
USD ($)
Apr. 30, 2025
USD ($)
Jan. 13, 2025
USD ($)
Dec. 06, 2024
USD ($)
Aug. 05, 2024
USD ($)
Sep. 12, 2023
USD ($)
Aug. 25, 2023
USD ($)
Mar. 30, 2023
tranche
Aug. 08, 2022
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2024
USD ($)
Finite-Lived Intangible Assets [Line Items]                                
Spectrum licenses                     $ 97,749,000,000   $ 97,749,000,000     $ 100,558,000,000
Amortization expense for intangible assets                     260,000,000 $ 221,000,000 688,000,000 $ 637,000,000    
Licensing Agreements | Spectrum Exchange Transactions                                
Finite-Lived Intangible Assets [Line Items]                                
Gain on spectrum exchange transactions                     0 10,000,000 13,000,000 57,000,000    
Spectrum licenses held for sale                     $ 243,000,000   $ 243,000,000      
Additional exchange agreements, expected closing period                     12 months   12 months      
Licensing Agreements | Non-Cash Spectrum License Acquisitions | Spectrum Exchange Transactions                                
Finite-Lived Intangible Assets [Line Items]                                
Consideration transferred, exchange of licenses                     $ 0 $ 26,000,000 $ 173,000,000 $ 165,000,000    
Licensing Agreements | Channel 51 License Co, LLC and LB License Co, LLC                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration               $ 3,500,000,000   $ 3,500,000,000            
Number of tranches licenses | tranche                 2              
Consideration transferred         $ 541,000,000 $ 2,400,000,000                    
Licensing Agreements | Channel 51 License Co, LLC and LB License Co, LLC | Second Tranche                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration $ 604,000,000             $ 1,100,000,000                
Licensing Agreements | Comcast Corporation                                
Finite-Lived Intangible Assets [Line Items]                                
License purchase agreement, minimum period before termination allowed             2 years                  
Licensing Agreements | Comcast Corporation | Spectrum Licenses | Forecast                                
Finite-Lived Intangible Assets [Line Items]                                
Spectrum licenses                             $ 45,000,000  
Licensing Agreements | Comcast Corporation | Minimum                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration       $ 1,200,000,000     $ 1,200,000,000                  
Licensing Agreements | Comcast Corporation | Maximum                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration       $ 3,400,000,000     3,300,000,000                  
Licensing Agreements | N77 License Co LLC                                
Finite-Lived Intangible Assets [Line Items]                                
Proceeds from sale of intangible assets     $ 2,000,000,000                          
Gain on spectrum exchange transactions                         151,000,000      
Licensing Agreements | Grain Management, LLC | Spectrum Licenses                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration   $ 2,900,000,000                            
Spectrum licenses                     3,600,000,000   3,600,000,000      
Increase our cash tax liability   $ 850,000,000                            
Licensing Agreements | Grain Management, LLC | Spectrum Licenses | Other current assets - of which, deferred purchase price                                
Finite-Lived Intangible Assets [Line Items]                                
Spectrum licenses held for sale                     2,900,000,000   2,900,000,000      
Licensing Agreements | Grain Management, LLC | Spectrum Licenses | Other Assets                                
Finite-Lived Intangible Assets [Line Items]                                
Spectrum licenses held for sale                     $ 690,000,000   $ 690,000,000      
Optional Sale Licenses | Comcast Corporation | Minimum                                
Finite-Lived Intangible Assets [Line Items]                                
Total cash consideration             $ 2,100,000,000