Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basis of Presentation
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities	$ 17	$ 21
TDS
Basis of Presentation
TDS ownership of U.S. Cellular	84.00%