Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 881
Ending balance	1,007
Device payment plan agreement
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	881
Current period provision for expected credit losses	669
Write-offs charged against the allowance	(560)
Recoveries collected	17
Ending balance	1,007
Wireless Service Plan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	143
Current period provision for expected credit losses	250
Write-offs charged against the allowance	(224)
Recoveries collected	19
Ending balance	$ 188