Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 13, 2019
Document and Entity Information
Entity Registrant Name	QWEST CORP
Entity Central Index Key	0000068622
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth	false
Entity Common Stock, Shares Outstanding		1