Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 39	$ 34	$ 111	$ 105
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	0	1	0	1
Comprehensive income	39	35	111	106
Less: Net income attributable to noncontrolling interests, net of tax	4	7	15	19
Comprehensive income attributable to TDS shareholders	$ 35	$ 28	$ 96	$ 87