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Consolidated Balance Sheet Parenthetical - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts receivable    
Customers and agents allowances $ 55 $ 51
Other allowances $ 1 $ 1
U.S. Cellular shareholders' equity    
Authorized shares 190 190
Issued shares 88 88
Outstanding shares 85 85
Par value $ 88 $ 88
Treasury shares 3 3
Variable Interest Entities VIE's    
Total VIE assets that can be used to settle only the VIEs' obligations $ 785 $ 827
Total VIE liabilities for which creditors have no recourse $ 24 $ 19
Series A Common Shares    
U.S. Cellular shareholders' equity    
Authorized shares 50 50
Issued shares 33 33
Outstanding shares 33 33
Par value per share $ 1.00 $ 1.00
Par value $ 33 $ 33
Common Shares    
U.S. Cellular shareholders' equity    
Authorized shares 140 140
Issued shares 55 55
Outstanding shares 52 52
Par value per share $ 1.00 $ 1.00
Par value $ 55 $ 55
Treasury shares 3 3