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Consolidated Statement Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 269 $ 147 $ 175
Change related to retirement plan      
Net actuarial gains 3 1 0
Prior service cost 0 0 (10)
Amortization of prior service cost 3 1 (1)
Amounts included in net periodic benefit cost for the period 6 2 (11)
Change in deferred income taxes (1) (1) 3
Change related to retirement plan, net of tax 5 1 (8)
Net change in accumulated other comprehensive income 5 1 (8)
Comprehensive income 274 148 167
Less: Net income attributable to noncontrolling interests, net of tax 43 26 40
Comprehensive income attributable to TDS shareholders $ 231 $ 122 $ 127