Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 83	$ 70
Change related to retirement plan Amounts included in net periodic benefit cost for the period
Amortization of prior service cost	1	0
Comprehensive income	84	70
Less: Net income attributable to noncontrolling interests, net of tax	14	11
Comprehensive income attributable to TDS shareholders	$ 70	$ 59