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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings per share
Net income available to TDS shareholders used in basic earnings per share	$ 39	$ 37
Net income available to TDS common shareholders used in diluted earnings per share	$ 39	$ 37
Weighted average number of shares used in basic earnings per share	111	110
Effects of dilutive securities	2	2
Weighted average number of shares used in diluted earnings per share	113	112
Basic earnings per share available to TDS common shareholders	$ 0.35	$ 0.34
Diluted earnings (loss) per share available to TDS common shareholders	$ 0.34	$ 0.33
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	104	103
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share	7	7

X

- Definition

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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