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Leases - Components of Lease Income (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases
Operating lease income	$ 100
Tower leases out of period adjustment
Leases
Immaterial error correction	During the third quarter of 2019, TDS recorded an out-of-period adjustment attributable to 2009 through the second quarter of 2019 due to errors in the timing of recognition of revenue for certain tower leases. This out-of-period adjustment had the impact of increasing operating lease income by $5 million for the year ended December 31, 2019. TDS determined that this adjustment was not material to any of the periods impacted.
Other service revenues | Tower leases out of period adjustment
Leases
Out-of-period adjustment	$ 5

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[Line Items] for Leases [Table]

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Describes nature and related effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Amount of each individual error being corrected in the correcting adjustment.

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