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Total number of licenses won in an FCC license auction.

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The total winning bid amount in a FCC license auction.

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Federal Communications Commission License Auction, Upfront Payment

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Weighted percentage of valuation method used in impairment test

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Amount by which the fair value of wireless spectrum licenses exceeds their respective carrying value.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit.

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Intangible Assets - Narrative (Details) $ in Millions	9 Months Ended	12 Months Ended
Intangible Assets - Narrative (Details) $ in Millions	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