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Earnings Per Share Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings per share
Net income available to TDS shareholders used in basic earnings per share	$ 33	$ 10	$ 72	$ 47
Noncontrolling interest adjustment	(1)		(1)
Net income available to TDS common shareholders used in diluted earnings per share	$ 32	$ 10	$ 71	$ 47
Weighted average number of shares used in basic earnings per share	112	111	112	110
Effects of dilutive securities	1	1	1	2
Weighted average number of shares used in diluted earnings per share	113	112	113	112
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
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	105	104	105	103
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	7	7	7	7

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Adjustment to arrive at diluted income attributable to shareholders that reflects changes in net income attributable to shareholders caused by changes in controlling ownership interest due to hypothetical exercise of dilutive securities during the period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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