Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 188	$ 269	$ 147
Change related to retirement plan
Net actuarial gains	9	3	1
Amortization of prior service cost	4	3	1
Amounts included in net periodic benefit cost for the period	13	6	2
Change in deferred income taxes	(4)	(1)	(1)
Change related to retirement plan, net of tax	9	5	1
Net change in accumulated other comprehensive income	9	5	1
Comprehensive income	197	274	148
Less: Net income attributable to noncontrolling interests, net of tax	32	43	26
Comprehensive income attributable to TDS shareholders	$ 165	$ 231	$ 122