Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 12	$ 32	$ 55	$ 42
Net change in accumulated other comprehensive income
Change in net unrealized gain on equity investments		1		1
Change related to retirement plan
Amortization of prior service cost		(1)	(1)	(1)
Comprehensive income	12	32	54	42
Less: Net income attributable to noncontrolling interests, net of tax	2	4	8	6
Comprehensive income attributable to TDS shareholders	$ 10	$ 28	$ 46	$ 36