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Debt - Term Loan Agreements (Details) - TDS Secured Term Loan shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) shares
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300
Amount borrowed during the period	$ 300
SOFR rate
Debt Instrument [Line Items]
Contractual spread	2.00%
UScellular | Assets available to be pledged
Debt Instrument [Line Items]
Common shares | shares	26

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