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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 93	$ 23	$ 254	$ 132
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	1	0	2	1
Comprehensive income	94	23	256	133
Less: Net income attributable to noncontrolling interests, net of tax	15	5	42	22
Comprehensive income attributable to TDS shareholders	$ 79	$ 18	$ 214	$ 111

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