Basis of Presentation and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015
Change in accounting method accounted for as change in estimate
Change in accounting estimates
Change in allocation of pension and post-retirement service costs	In 2015, our ultimate parent company, CenturyLink, Inc. ("CenturyLink"), changed their allocation methodology with respect to their now centrally managed pension and post-retirement plans. Specifically, under this new methodology, CenturyLink will allocate current service costs to subsidiaries relative to employees which are currently earning benefits under the pension and post-retirement benefit plans. The net periodic benefit cost allocated to us is now paid on a monthly basis through CenturyLink’s intercompany cash management process. The change in methodology resulted in a decrease of $7 million to our net periodic benefit cost for the year ended December 31, 2015.