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Wireless Licenses, Goodwill and Other Intangible Assets - Composition of Other Intangible Assets, Net (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 32,941 | $ 32,515
Accumulated Amortization | (22,106) | (21,458)
Net Amount | 10,835 | 11,057
Customer Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,335 | 4,335
Accumulated Amortization | (2,387) | (2,193)
Net Amount | $ 1,948 | 2,142
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 | $ 25,950 | 25,524
Accumulated Amortization | (18,387) | (17,949)
Net Amount | 7,563 | 7,575
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,656 | 2,656
Accumulated Amortization | (1,332) | (1,316)
Net Amount | $ 1,324 | $ 1,340
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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