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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 53	[1]	$ (231)	$ 155	[1]	$ (176)
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 (loss)	53		(231)	154		(177)
Less: Net income (loss) attributable to noncontrolling interests, net of tax	7		(50)	36		(42)
Comprehensive income (loss) attributable to TDS shareholders	$ 46		$ (181)	$ 118		$ (135)
[1] As of January 1, 2018, TDS adopted ASU 2014-09 using a modified retrospective approach. Under this method, the new accounting standard is applied only to the most recent period presented. As a result, 2018 amounts include the impacts of ASU 2014-09, but 2017 amounts remain as previously reported, except as specifically stated. See Note 2 — Revenue Recognition for additional information.

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