Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings per share
Net income available to TDS common shareholders used in basic earnings per share	$ 10	$ 28	$ 47	$ 36
Net income available to TDS common shareholders used in diluted earnings per share	$ 10	$ 28	$ 47	$ 36
Weighted average number of shares used in basic earnings per share	111	109	110	109
Effects of dilutive securities	1	2	2	2
Weighted average number of shares used in diluted earnings per share	112	111	112	111
Basic earnings per share available to TDS common shareholders	$ 0.09	$ 0.25	$ 0.43	$ 0.33
Diluted earnings per share available to TDS common shareholders	$ 0.09	$ 0.25	$ 0.42	$ 0.32
Earnings per share, Other disclosures
Antidilutive securities	5	4	4	4
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	104	102	103	102
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	7	7	7	7

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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