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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, 2023	Dec. 31, 2022
Receivables [Abstract]
Device payment plan agreement receivables, gross	$ 26,988	$ 26,188
Unamortized imputed interest	(642)	(479)
Device payment plan agreement receivables, at amortized cost	26,346	25,709
Allowance	(1,045)	(881)
Device payment plan agreement receivables, net	25,301	24,828
Accounts receivable, net	12,344	12,929
Other assets	$ 12,957	$ 11,899

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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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