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Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 1,151
Ending balance 1,194
Device payment plan agreement  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 1,151
Current period provision for expected credit losses 374
Write-offs charged against the allowance (342)
Recoveries collected 11
Ending balance 1,194
Wireless Service Plan Receivables  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 213
Current period provision for expected credit losses 131
Write-offs charged against the allowance (137)
Recoveries collected 11
Ending balance $ 218