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Consolidated Statement Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 157 $ 52 $ 263
Net change in accumulated other comprehensive income      
Change in net unrealized gain on equity investments   1  
Change related to retirement plan      
Net actuarial gains 2 2 1
Prior service cost (3) 0 (7)
Amortization of prior service cost (2) (2) (3)
Total gains (losses) recognized in Comprehensive Income before income tax benefit (expense) (3)   (9)
Change in deferred income taxes 1   3
Change related to retirement plan, net of tax (2)   (6)
Net change in accumulated other comprehensive income (2) 1 (6)
Comprehensive income 155 53 257
Less: Net income attributable to noncontrolling interest, net of tax 4 9 44
Comprehensive income attributable to TDS shareholders $ 151 $ 44 $ 213