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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 70	$ 57
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	0	(1)
Comprehensive income	70	56
Less: Net income attributable to noncontrolling interests, net of tax	11	18
Comprehensive income attributable to TDS shareholders	$ 59	$ 38

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