Document and Entity Information - shares	6 Months Ended
	Jun. 26, 2021	Aug. 03, 2021
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 26, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Registrant Name	McAfee Corp.
Entity Central Index Key	0001783317
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-25
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Class A Common Stock, $0.001 par value
Trading Symbol	MCFE
Security Exchange Name	NASDAQ
Entity File Number	001-39651
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-2467341
Entity Address, Address Line One	6220 America Center Drive
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95002
City Area Code	866
Local Phone Number	622-3911
Document Quarterly Report	true
Document Transition Report	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		168,968,217
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		265,376,691