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Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings per share
Net income attributable to TDS shareholders used in basic earnings per share	$ 59	$ 39
Noncontrolling interest adjustment	(1)	0
Net income attributable to TDS shareholders used in diluted earnings per share	$ 58	$ 39
Weighted average number of shares used in basic earnings per share (in shares)	114	111
Effects of dilutive securities (in shares)	2	2
Weighted average number of shares used in diluted earnings per share (in shares)	116	113
Basic earnings per share attributable to TDS shareholders (in dollars per share)	$ 0.52	$ 0.35
Diluted earnings per share attributable to TDS shareholders (in dollars per share)	$ 0.50	$ 0.34
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share (in shares)	107	104
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings per share (in shares)	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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