Consolidated Balance Sheet Parenthetical - USD ($) shares in Millions, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Accounts receivable
Customer and agent allowances	$ 60	$ 55
Other allowances	$ 1	$ 1
U.S. Cellular shareholders' equity
Authorized shares	190	190
Issued shares	88	88
Outstanding shares	86	85
Par value	$ 88	$ 88
Variable Interest Entities VIEs
Total VIE assets that can be used to settle only the VIEs' obligations	813	785
Total VIE liabilities for which creditors have no recourse	$ 20	$ 24
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	53	52
Par value per share	$ 1.00	$ 1.00
Par value	$ 55	$ 55
Treasury shares	3	3