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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Device Payment Plan Agreement Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Receivables [Abstract]
Device payment plan agreement receivables, gross	$ 29,202	$ 29,206
Unamortized imputed interest	(883)	(758)
Device payment plan agreement receivables, at amortized cost	28,319	28,448
Allowance	(1,130)	(1,151)
Device payment plan agreement receivables, net	27,189	27,297
Accounts receivable, net	14,518	13,173
Other assets	$ 12,671	$ 14,124

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