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Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 1,315
Ending balance 1,427
Device payment plan agreement  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 1,315
Current period provision for expected credit losses 1,080
Write-offs charged against the allowance (1,003)
Recoveries collected 35
Ending balance 1,427
Wireless Service Plan Receivables  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 240
Current period provision for expected credit losses 355
Write-offs charged against the allowance (390)
Recoveries collected 37
Ending balance $ 242