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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable, net of allowance $ 13,173 $ 12,929
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 26,102 25,332
Less Allowance for credit losses 1,017 826
Accounts receivable, net 25,085 $ 24,506
Device payment plan agreement    
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 13,732  
Less Allowance for credit losses 559  
Accounts receivable, net of allowance 13,173  
Wireless service    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 5,352  
Less Allowance for credit losses 213  
Accounts receivable, net 5,139  
Other receivables    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 7,018  
Less Allowance for credit losses 245  
Accounts receivable, net $ 6,773