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Intangible Assets - Narrative (Details) $ in Millions		12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2022 USD ($) license	Dec. 31, 2021 USD ($) license	Dec. 31, 2020 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Goodwill		$ 547	$ 547
Amortization expense for intangible assets		21	21	$ 26
Estimated amortization expense
2023		22
2024		19
2025		19
2026		19
2027		19
TDS Telecom
Indefinite-lived Intangible Assets [Line Items]
Goodwill		547	$ 547
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		8	36
Auction 107 | UScellular | Subsequent Event
Indefinite-lived Intangible Assets [Line Items]
Cash paid for licenses	$ 185
Auction 107 | UScellular | Other current liabilities
Indefinite-lived Intangible Assets [Line Items]
Short-term spectrum license liabilities		133	17
Auction 107 | UScellular | Other deferred liabilities and credits
Indefinite-lived Intangible Assets [Line Items]
Long-term spectrum license liabilities		$ 8	128
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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