Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Device Payment Plan Agreement Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Device payment plan agreement receivables, gross	$ 26,586	$ 26,188
Unamortized imputed interest	(538)	(479)
Device payment plan agreement receivables, at amortized cost	26,048	25,709
Allowance	(932)	(881)
Device payment plan agreement receivables, net	25,116	24,828
Accounts receivable, net	12,587	12,929
Other assets	$ 12,529	$ 11,899