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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Device Payment Plan Agreement Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Device payment plan agreement receivables, gross	$ 29,296	$ 29,206
Unamortized imputed interest	(799)	(758)
Device payment plan agreement receivables, at amortized cost	28,497	28,448
Allowance	(1,194)	(1,151)
Device payment plan agreement receivables, net	27,303	27,297
Accounts receivable, net	13,696	13,173
Other assets	$ 13,607	$ 14,124

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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