Basis of Presentation (Details 2) number in Millions, $ in Millions		6 Months Ended	9 Months Ended
	Aug. 27, 2015 USD ($) state	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 state
Products and Services Revenues
Number of states in which entity operates (states) | state				14
CAF Phase 2 Support | CenturyLink, Inc.
Products and Services Revenues
Federal support, total amount per agreement | $	$ 500
Agreement term (in years)	6 years
Number of rural households and businesses	1.2
Number of states in which entity operates (states) | state	33
CAF Phase 2 Support | Qwest Corporation
Products and Services Revenues
Federal support, total amount per agreement | $	$ 150
Number of rural households and businesses	0.3
Number of states in which entity operates (states) | state	13
Other Operating Revenues, Transitional Revenues | $		$ 42	$ 50