Cover Page	9 Months Ended
	Sep. 30, 2022 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-35134
Entity Registrant Name	LEVEL 3 PARENT, LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-0210602
Entity Address, Address Line One	1025 Eldorado Blvd.,
Entity Address, City or Town	Broomfield,
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80021-8869
City Area Code	720
Local Phone Number	888-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Central Index Key	0000794323
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3