Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Millions				1 Months Ended	12 Months Ended
	Nov. 05, 2021 USD ($) $ / shares	Mar. 06, 2021 USD ($)	Oct. 21, 2020	Oct. 31, 2020 USD ($) $ / shares shares	Dec. 25, 2021 USD ($) $ / shares	Dec. 26, 2020 USD ($) $ / shares	Dec. 28, 2019 USD ($)
Basis Of Presentation [Line Items]
Business, formation date					Jul. 19, 2019
Proceeds from exercising options for Common stock					$ 15	$ 2	$ 1
Proceeds from divesture of businesses		$ 4,000
Divestiture transaction expire date		Jul. 27, 2021
Proposed Agreement and Plan of Merger
Basis Of Presentation [Line Items]
Awards vesting percentage	12.50%
Awards unvested percentage	25.00%
Conversion of Shares into Rights for Cash Consideration per share \| $ / shares	$ 26.00
McAfee Corp. Stockholders' Equity \| Tax Receivable Agreement
Basis Of Presentation [Line Items]
Deferred tax liabilities current, tax receivable agreement, accounts payable and other accrued liabilities	$ 2
Class A Common Stock
Basis Of Presentation [Line Items]
Common Stock, par value \| $ / shares					$ 0.001	$ 0.001
Shares settlement, exchange ratio				1	1
Stock issued for exchange of ownership \| shares				126,300,000
Class A Common Stock \| RSUs
Basis Of Presentation [Line Items]
Settled restricted stock units \| shares				5,700,000
Initial Public Offering
Basis Of Presentation [Line Items]
Common stock, shares, issued \| shares				31,000,000
Proceeds from exercising options for Common stock				$ 586
Initial Public Offering \| Class A Common Stock
Basis Of Presentation [Line Items]
Common stock, shares, issued \| shares				37,000,000.0
Common Stock, par value \| $ / shares				$ 0.001
Common stock per share \| $ / shares				$ 20.00
Foundation Technology Worldwide L L C
Basis Of Presentation [Line Items]
Percentage of ownership after the reorganization transaction			100.00%		100.00%
LLC Units \| Initial Public Offering
Basis Of Presentation [Line Items]
Purchase of issued and outstanding LLC units cost				$ 553
Continuing LLC Owners \| Initial Public Offering
Basis Of Presentation [Line Items]
Purchase of issued and outstanding LLC units cost				$ 33

McAfee Corp. 10-K