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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 34	$ 78	$ 105	$ 161
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	1	1	1	2
Comprehensive income	35	79	106	163
Less: Net income attributable to noncontrolling interests, net of tax	7	13	19	26
Comprehensive income attributable to TDS shareholders	$ 28	$ 66	$ 87	$ 137

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