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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Earnings per share
Net income available to TDS common shareholders used in basic earnings per share		$ 8	$ 146
Noncontrolling interest adjustment			(1)
Net income available to TDS common shareholders used in diluted earnings per share		$ 8	$ 145
Weighted average number of shares used in basic earnings per share		109	108
Effects of dilutive securities	[1]	1	1
Weighted average number of shares used in diluted earnings per share		110	109
Basic earnings per share available to TDS common shareholders		$ 0.07	$ 1.35
Diluted earnings per share available to TDS common shareholders		$ 0.07	$ 1.33
Earnings per share, Other disclosures
Antidilutive securities		7	6
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share		102	101
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share		7	7
[1] Includes effects of stock options, restricted stock units and preferred shares.

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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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