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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23	$ 53	$ 132	$ 155
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	0	0	1	(1)
Comprehensive income	23	53	133	154
Less: Net income attributable to noncontrolling interests, net of tax	5	7	22	36
Comprehensive income attributable to TDS shareholders	$ 18	$ 46	$ 111	$ 118

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