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Consolidated Statement Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 147 $ 175 $ 157
Change related to retirement plan      
Net actuarial gains 1 0 2
Prior service cost 0 (10) (3)
Amortization of prior service cost 1 (1) (2)
Amounts included in net periodic benefit cost for the period 2 (11) (3)
Change in deferred income taxes (1) 3 1
Change related to retirement plan, net of tax 1 (8) (2)
Net change in accumulated other comprehensive income 1 (8) (2)
Comprehensive income 148 167 155
Less: Net income attributable to noncontrolling interests, net of tax 26 40 4
Comprehensive income attributable to TDS shareholders $ 122 $ 127 $ 151