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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable, net $ 12,344 $ 12,929
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 24,559 25,332
Less Allowance for credit losses 957 826
Accounts receivable, net of allowance 23,602 $ 24,506
Device payment plan agreement    
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 12,860  
Less Allowance for credit losses 516  
Accounts receivable, net 12,344  
Wireless service    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 5,503  
Less Allowance for credit losses 203  
Accounts receivable, net 5,300  
Other receivables    
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Accounts receivable 6,196  
Less Allowance for credit losses 238  
Accounts receivable, net $ 5,958