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Device Payment Plan Agreement and Wireless Service Receivables - Balance and Aging of Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | $ 29,206 | $ 26,188
Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 28,448 |
Unbilled | Financial Asset, Not Past Due | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 27,174 |
Billed | Financial Asset, Not Past Due | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | 1,000 |
Billed | Financial Asset, Past Due | Device payment plan agreement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Device payment plan agreement receivables, gross | $ 274 |

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