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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share
Net income available to TDS common shareholders used in basic earnings (loss) per share	$ 153	$ 43	$ 219
Noncontrolling interest adjustment			(1)
Net income available to TDS common shareholders used in diluted earnings (loss) per share	$ 153	$ 43	$ 218
Weighted average number of shares used in basic earnings (loss) per share	111	110	109
Effects of dilutive securities	1	1	1
Weighted average number of shares used in diluted earnings (loss) per share	112	111	110
Basic earnings per share available to TDS common shareholders	$ 1.39	$ 0.39	$ 2.02
Diluted earnings per share available to TDS common shareholders	$ 1.37	$ 0.39	$ 1.98
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share	104	103	102
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share	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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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