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Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings per share
Net income (loss) available to TDS common shareholders used in basic earnings (loss) per share	$ 46	$ (181)	$ 119	$ (134)
Noncontrolling interest adjustment	0	0	(2)	0
Net income (loss) available to TDS common shareholders used in diluted earnings (loss) per share	$ 46	$ (181)	$ 117	$ (134)
Weighted average number of shares used in basic earnings (loss) per share (in shares)	112	111	112	111
Effects of dilutive securities (in shares)	2	0	1	0
Weighted average number of shares used in diluted earnings (loss) per share (in shares)	114	111	113	111
Basic earnings (loss) per share available to TDS common shareholders (in dollars per share)	$ 0.41	$ (1.64)	$ 1.06	$ (1.21)
Diluted earnings (loss) per share available to TDS common shareholders (in dollars per share)	$ 0.41	$ (1.64)	$ 1.04	$ (1.21)
Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share (in shares)	105	104	105	104
Series A Common Shares
Earnings per share
Weighted average number of shares used in basic earnings (loss) per share (in shares)	7	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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