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Basis of Presentation, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basis of Presentation [Line Items]
Depreciation, amortization and accretion	$ 220	$ 211	$ 441	$ 422
Selling, general and administrative	417	420	813	826
Other, net income	1	1	2	2
Income before income taxes	65	22	146	99
Net income	$ 44	$ 12	$ 101	$ 55
Basic earnings per share available to TDS common shareholders	$ 0.30	$ 0.09	$ 0.65	$ 0.43
Diluted earnings per share available to TDS common shareholders	$ 0.29	$ 0.09	$ 0.63	$ 0.42
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities	$ 22	$ 20	$ 45	$ 38
Franchise rights
Basis of Presentation [Line Items]
Useful life			15 years
Impairment of franchise rights			$ 0
Depreciation, amortization and accretion	4		9
Net income	$ (3)		$ (7)
Basic earnings per share available to TDS common shareholders	$ (0.03)		$ (0.06)
Diluted earnings per share available to TDS common shareholders	$ (0.03)		$ (0.06)
Adjustment | ASU 2017-07
Basis of Presentation [Line Items]
Selling, general and administrative		1		1
Other, net income		1		1
Income before income taxes		0		0
Net income		$ 0		$ 0
Basic earnings per share available to TDS common shareholders		$ 0		$ 0
Cumulative impact to retained earnings		$ 0		$ 0
U.S. Cellular
Basis of Presentation [Line Items]
TDS ownership of U.S. Cellular	83.00%		83.00%

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