Commitments, Contingencies and Other Items (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) plaintiff lawsuit
Loss Contingencies [Line Items]
Estimate of possible loss	$ 23,000,000
U.S. District Court for the District of Minnesota
Loss Contingencies [Line Items]
Amount awarded to other party	15,500,000
Litigation settlement, expense	$ 3,500,000
Number of plaintiffs (more than) | plaintiff	22,000
Interexchange carriers | Subsidiaries of CenturyLink, Inc.
Loss Contingencies [Line Items]
Number of lawsuits (approximately) | lawsuit	100
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Estimate of possible loss	$ 100,000