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Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 1,151
Ending balance 1,210
Device payment plan agreement  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 1,151
Current period provision for expected credit losses 742
Write-offs charged against the allowance (703)
Recoveries collected 20
Ending balance 1,210
Wireless Service Plan Receivables  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 213
Current period provision for expected credit losses 261
Write-offs charged against the allowance (268)
Recoveries collected 23
Ending balance $ 229