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Acquisitions and Divestitures - Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Nov. 23, 2021
Feb. 28, 2021
Jun. 30, 2024
Jun. 30, 2023
Business Acquisition [Line Items]        
Payments for deposits     $ 613 $ 1,085
Spectrum licenses | Spectrum Licenses, C-Band        
Business Acquisition [Line Items]        
Estimated clearing and incentive costs   $ 7,500    
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs        
Business Acquisition [Line Items]        
Payments for deposits     269 114
TracFone Wireless, Inc.        
Business Acquisition [Line Items]        
Business acquisition, purchase price in cash $ 3,500      
Number of shares issuable (in shares) 57,596,544      
Business combination, consideration transferred, equity interests issued and issuable $ 3,000      
Future cash consideration related to achievement of certain performance measures 650      
Contingent consideration $ 560      
Contingent consideration, earn out period 2 years      
Contingent consideration payment     $ 52 $ 102