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Intangible Assets - Narrative (Details) $ in Millions | 12 Months Ended | 42 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) reporting_unit | Dec. 31, 2022 USD ($) license | Dec. 31, 2021 USD ($) license | Dec. 31, 2020 USD ($) | Mar. 31, 2025 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 0 | $ 547 |  |  |
Amortization expense for intangible assets | 22 | 21 | $ 21 |  |
Estimated amortization expense |  |  |  |  |
2024 | 19 |  |  |  |
2025 | 19 |  |  |  |
2026 | 19 |  |  |  |
2027 | 19 |  |  |  |
2028 | $ 19 |  |  |  |
Discounted cash flow method |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Weighted percentage of valuation method | 75.00% |  |  |  |
Guideline public company method |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Weighted percentage of valuation method | 25.00% |  |  |  |
TDS Telecom |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 0 | 547 |  |  |
Number of reporting units | reporting_unit | 1 |  |  |  |
Loss on impairment of goodwill | $ 547 | 0 |  |  |
Accumulated impairment losses in prior periods |  | 29 |  |  |
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 | 122 | 8 | 36 |  |
Auction 107 | UScellular | Subsequent Event |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Cash paid for licenses |  |  |  |  | $ 179
Auction 107 | UScellular | Other current liabilities |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Short-term spectrum license liabilities | $ 13 | 133 |  |  |
Auction 107 | UScellular | Other deferred liabilities and credits |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Long-term spectrum license liabilities |  | $ 8 |  |  |
Auction 110 | UScellular |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Licenses won | license |  | 380 |  |  |
Total winning bid |  | $ 580 |  |  |
FCC upfront payment |  |  | $ 20 |  |

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