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Intangible Assets - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) reporting_unit license | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) license | Dec. 31, 2020 USD ($) | Dec. 31, 2024 license | Dec. 31, 2024 | Jun. 30, 2024
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
FCC licenses, number of accounting units |  |  | 1 |  |  |  | 12 | 12 | 2
Loss on impairment of intangible assets | $ 136 |  | $ 0 |  |  |  |  |  |
Licenses |  | $ 4,588 | 4,702 |  |  |  |  |  |
Amortization expense for intangible assets |  | 22 | 22 | $ 21 |  |  |  |  |
Estimated amortization expense |  |  |  |  |  |  |  |  |
2025 |  | 29 |  |  |  |  |  |  |
2026 |  | 29 |  |  |  |  |  |  |
2027 |  | 29 |  |  |  |  |  |  |
2028 |  | 29 |  |  |  |  |  |  |
2029 |  | 29 |  |  |  |  |  |  |
High-band spectrum |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Licenses | $ 161 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Wireless spectrum license fair value exceeds carrying value | 80.00% |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Wireless spectrum license fair value exceeds carrying value | 9.00% |  |  |  |  |  |  |  |
TDS Telecom |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 0 |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  | 1 |  |  |  |  |  |
Loss on impairment of goodwill |  |  | $ 547 |  |  |  |  |  |
TDS Telecom | Discounted cash flow method |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted percentage of valuation method |  |  | 75.00% |  |  |  |  |  |
TDS Telecom | Guideline public company method |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted percentage of valuation method |  |  | 25.00% |  |  |  |  |  |
Auction 107 | UScellular |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
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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