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Revenue Recognition - Consolidated Statement Of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenues      
Total operating revenues $ 5,109 $ 5,044 $ 5,155
Selling, general and administrative 1,694 1,689 1,762
(Gain) loss on license sales and exchanges, net (18) (22) (20)
Total operating expenses 4,904 5,152 5,047
Operating income (loss) 205 (108) 108
Income (loss) before income taxes 221 (122) 92
Income tax expense (benefit) 46 (279) 40
Net income 175 157 52
Less: Net income attributable to noncontrolling interests, net of tax 40 4 9
Net income attributable to TDS shareholders 135 153 43
Net income available to TDS common shareholders $ 135 $ 153 $ 43
Basic earnings per share available to TDS common shareholders (in dollars per share) $ 1.20 $ 1.39 $ 0.39
Diluted earnings per share available to TDS common shareholders (in dollars per share) $ 1.17 $ 1.37 $ 0.39
Service      
Operating revenues      
Total operating revenues $ 3,999 $ 3,979 $ 4,050
Cost of goods and services 1,206 1,164 1,189
Equipment and product sales      
Operating revenues      
Total operating revenues 1,110 1,065 1,105
Cost of goods and services 1,130 $ 1,195 $ 1,240
Results under prior accounting standards      
Operating revenues      
Total operating revenues 5,122    
Selling, general and administrative 1,697    
(Gain) loss on license sales and exchanges, net (17)    
Total operating expenses 4,907    
Operating income (loss) 215    
Income (loss) before income taxes 231    
Income tax expense (benefit) 48    
Net income 183    
Less: Net income attributable to noncontrolling interests, net of tax 42    
Net income attributable to TDS shareholders 141    
Net income available to TDS common shareholders $ 141    
Basic earnings per share available to TDS common shareholders (in dollars per share) $ 1.25    
Diluted earnings per share available to TDS common shareholders (in dollars per share) $ 1.22    
Results under prior accounting standards | Service      
Operating revenues      
Total operating revenues $ 4,108    
Results under prior accounting standards | Equipment and product sales      
Operating revenues      
Total operating revenues 1,014    
Cost of goods and services 1,129    
ASU 2014-09 | Adjustment      
Operating revenues      
Total operating revenues (13)    
Selling, general and administrative (3)    
(Gain) loss on license sales and exchanges, net (1)    
Total operating expenses (3)    
Operating income (loss) (10)    
Income (loss) before income taxes (10)    
Income tax expense (benefit) (2)    
Net income (8)    
Less: Net income attributable to noncontrolling interests, net of tax (2)    
Net income attributable to TDS shareholders (6)    
Net income available to TDS common shareholders $ (6)    
Basic earnings per share available to TDS common shareholders (in dollars per share) $ (0.05)    
Diluted earnings per share available to TDS common shareholders (in dollars per share) $ (0.05)    
ASU 2014-09 | Adjustment | Service      
Operating revenues      
Total operating revenues $ (109)    
ASU 2014-09 | Adjustment | Equipment and product sales      
Operating revenues      
Total operating revenues 96    
Cost of goods and services $ 1