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Device Payment Plan Agreement and Wireless Service Receivables - Balance and Aging of Receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device payment plan agreement receivables, gross $ 26,988 $ 26,188
Device payment plan agreement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device payment plan agreement receivables, gross 26,346  
Unbilled | Current | Device payment plan agreement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device payment plan agreement receivables, gross 25,109  
Billed | Current | Device payment plan agreement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device payment plan agreement receivables, gross 996  
Billed | Past due | Device payment plan agreement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device payment plan agreement receivables, gross $ 241