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Device Payment Plan Agreement and Wireless Service Receivables - Balance and Aging of Receivables (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | $ 26,521 | $ 26,188
Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 25,942 |
Unbilled | Current | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 24,712 |
Billed | Current | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 1,007 |
Billed | Past due | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | $ 223 |

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