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Revenue Recognition Consolidated Statement Of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating revenues    
Service $ 978 $ 997
Equipment and product sales 247 241
Total operating revenues 1,225 1,238
Cost of equipment and products 246 270
(Gain) loss on license sales and exchanges, net (7) (17)
Total operating expenses 1,145 1,157
Operating income (loss) 80 81
Income (loss) before income taxes 81 77
Income tax expense 24 34
Net income (loss) 57 43
Less: Net income attributable to noncontrolling interests, net of tax 18 6
Net income (loss) attributable to TDS shareholders 39 37
Net income (loss) avalable to TDS shareholders $ 39 $ 37
Basic earnings (loss) per share available to TDS common shareholders $ 0.35 $ 0.34
Diluted earnings (loss) per share available to TDS common shareholders $ 0.34 $ 0.33
Results under prior accounting standards    
Operating revenues    
Service $ 1,008  
Equipment and product sales 226  
Total operating revenues 1,235  
Cost of equipment and products 249  
(Gain) loss on license sales and exchanges, net (6)  
Total operating expenses 1,149  
Operating income (loss) 86  
Income (loss) before income taxes 87  
Income tax expense 26  
Net income (loss) 61  
Less: Net income attributable to noncontrolling interests, net of tax 19  
Net income (loss) attributable to TDS shareholders 42  
Net income (loss) avalable to TDS shareholders $ 42  
Basic earnings (loss) per share available to TDS common shareholders $ 0.38  
Diluted earnings (loss) per share available to TDS common shareholders $ 0.37  
Adjustment    
Operating revenues    
Service $ (30)  
Equipment and product sales 21  
Total operating revenues (10)  
Cost of equipment and products (3)  
(Gain) loss on license sales and exchanges, net (1)  
Total operating expenses (4)  
Operating income (loss) (6)  
Income (loss) before income taxes (6)  
Income tax expense (2)  
Net income (loss) (4)  
Less: Net income attributable to noncontrolling interests, net of tax (1)  
Net income (loss) attributable to TDS shareholders (3)  
Net income (loss) avalable to TDS shareholders $ (3)  
Basic earnings (loss) per share available to TDS common shareholders $ (0.03)  
Diluted earnings (loss) per share available to TDS common shareholders $ (0.03)