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Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 881
Ending balance 1,151
Device payment plan agreement  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 881
Current period provision for expected credit losses 1,439
Write-offs charged against the allowance (1,201)
Recoveries collected 32
Ending balance 1,151
Wireless service  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 143
Current period provision for expected credit losses 502
Write-offs charged against the allowance (470)
Recoveries collected 38
Ending balance $ 213