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Intangible Assets - Narrative (Details) $ in Millions	12 Months Ended				42 Months Ended
Intangible Assets - Narrative (Details) $ in Millions	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