Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 881
Ending balance	932
Device payment plan agreement
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	881
Current period provision for expected credit losses	330
Write-offs charged against the allowance	(287)
Recoveries collected	8
Ending balance	932
Wireless Service Plan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	143
Current period provision for expected credit losses	130
Write-offs charged against the allowance	(102)
Recoveries collected	8
Ending balance	$ 179