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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable, net $ 14,998 $ 15,141
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 27,083 27,261
Less Allowance for credit losses 1,163 1,152
Accounts receivable, net 25,920 $ 26,109
Device payment plan agreement    
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 15,738  
Less Allowance for credit losses 740  
Accounts receivable, net 14,998  
Wireless service    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 6,123  
Less Allowance for credit losses 242  
Accounts receivable, net 5,881  
Other receivables    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 5,222  
Less Allowance for credit losses 181  
Accounts receivable, net $ 5,041