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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable, net $ 14,518 $ 13,173
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 27,040 26,102
Less Allowance for credit losses 1,086 1,017
Accounts receivable, net 25,954 $ 25,085
Device payment plan agreement    
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 15,121  
Less Allowance for credit losses 603  
Accounts receivable, net 14,518  
Wireless service    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 6,057  
Less Allowance for credit losses 237  
Accounts receivable, net 5,820  
Other receivables    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 5,862  
Less Allowance for credit losses 246  
Accounts receivable, net $ 5,616