Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 759
Ending balance	881
Device payment plan agreement
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	759
Current period provision for expected credit losses	958
Write-offs charged against the allowance	(869)
Recoveries collected	33
Ending balance	881
Wireless service
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	130
Current period provision for expected credit losses	428
Write-offs charged against the allowance	(463)
Recoveries collected	48
Ending balance	$ 143