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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 39	$ 44	$ 109	$ 101
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	0	0	0	(1)
Comprehensive income	39	44	109	100
Less: Net income attributable to noncontrolling interests, net of tax	6	11	17	29
Comprehensive income attributable to TDS shareholders	$ 33	$ 33	$ 92	$ 71

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