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Acquisitions and Divestitures - Spectrum License Transactions (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 17, 2024 | Feb. 28, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |
Payments for intangible assets |  |  | $ 900 | $ 5,796 | $ 3,653
Spectrum Licenses, United States Cellular Corporation (UScellular) |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Asset acquisition, consideration transferred | $ 1,000 |  |  |  |
Spectrum Licenses, C-Band | Spectrum Licenses |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated clearing and incentive costs |  | $ 7,500 |  |  |
Spectrum Licenses, C-Band | Spectrum Licenses | Satellite Agreements |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments for intangible assets |  |  |  |  | 310
Costs incurred for license agreements acquired |  |  |  |  | 340
Spectrum Licenses, C-Band | Spectrum Licenses | Projected Clearing Costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments for intangible assets |  |  | $ 269 | $ 4,300 | $ 1,600

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