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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 31,834 | $ 30,562
Accumulated Amortization | (20,882) | (19,101)
Net Amount | 10,952 | 11,461
Customer Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,335 | 4,335
Accumulated Amortization | (2,049) | (1,646)
Net Amount | $ 2,286 | 2,689
Customer Lists | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible asset, useful life | 5 years |
Customer Lists | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible asset, useful life | 13 years |
Non-Network Internal-Use Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible asset, useful life | 7 years |
Gross Amount | $ 24,853 | 23,421
Accumulated Amortization | (17,586) | (16,397)
Net Amount | 7,267 | 7,024
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,646 | 2,806
Accumulated Amortization | (1,247) | (1,058)
Net Amount | $ 1,399 | $ 1,748
Other | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible asset, useful life | 4 years |
Other | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible asset, useful life | 25 years |

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