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Intangible Assets - Narrative (Details) $ in Millions			12 Months Ended
	Dec. 31, 2024 USD ($)	Jan. 14, 2022 USD ($) license	Dec. 31, 2021 USD ($) license	Dec. 31, 2020 USD ($) license	Dec. 31, 2019 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Goodwill			$ 547	$ 547
Amortization expense for intangible assets			21	26	$ 24
Estimated amortization expense
2022			20
2023			20
2024			17
2025			17
2026			17
TDS Telecom
Indefinite-lived Intangible Assets [Line Items]
Goodwill			547	$ 547
Accumulated impairment losses in prior periods			$ 29
Auction 103 | UScellular
Indefinite-lived Intangible Assets [Line Items]
Licenses won | license				237
Total winning bid				$ 146
FCC upfront payment					$ 5
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			36
Auction 107 | UScellular | Subsequent Event
Indefinite-lived Intangible Assets [Line Items]
Cash paid for licenses	$ 181
Auction 110 | UScellular
Indefinite-lived Intangible Assets [Line Items]
FCC upfront payment			$ 20
Auction 110 | UScellular | Subsequent Event
Indefinite-lived Intangible Assets [Line Items]
Licenses won | license		380
Total winning bid		$ 580

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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