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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable, net $ 13,696 $ 13,173
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 26,380 26,102
Less Allowance for credit losses 1,061 1,017
Accounts receivable, net of allowance 25,319 $ 25,085
Device payment plan agreement    
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 14,289  
Less Allowance for credit losses 593  
Accounts receivable, net 13,696  
Wireless service    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 5,678  
Less Allowance for credit losses 218  
Accounts receivable, net 5,460  
Other receivables    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 6,413  
Less Allowance for credit losses 250  
Accounts receivable, net $ 6,163