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Intangible Assets - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) unit | Dec. 31, 2023 USD ($) unit | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) license | Dec. 31, 2020 USD ($) | Jun. 30, 2024 unit
Licenses |  |  |  |  |  |  |
Cash paid for licenses |  | $ 20 | $ 130 | $ 585 |  |  |
FCC Licenses, number of accounting units | unit |  | 12 | 1 |  |  |  | 2
Loss on impairment of licenses | $ 136 | $ 136 | $ 0 | 3 |  |  |
Licenses |  | 4,579 | 4,693 |  |  |  |
High-band spectrum |  |  |  |  |  |  |
Licenses |  |  |  |  |  |  |
Licenses | $ 161 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Licenses |  |  |  |  |  |  |
Wireless spectrum license fair value exceeds carrying value | 9.00% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Licenses |  |  |  |  |  |  |
Wireless spectrum license fair value exceeds carrying value | 80.00% |  |  |  |  |  |
Auction 107 |  |  |  |  |  |  |
Licenses |  |  |  |  |  |  |
Licenses won | license |  |  |  |  | 254 |  |
Total winning bid |  |  |  |  | $ 1,283 |  |
FCC Upfront Payment |  |  |  |  |  | $ 30 |
Cash paid for licenses |  | $ 8 | $ 122 | $ 8 | $ 36 |  |

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