Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Universal Service Fund) (Details)

v3.10.0.1
Summary of Significant Accounting Policies (Universal Service Fund) (Details) - USF Program
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Revenue support from regulatory agency, percentage 23.00%
Receivables net, current $ 91.3