Earnings Per Share - Schedule of Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 26, 2021	Jun. 26, 2021
Earnings Per Share [Line Items]
Net income attributable to McAfee Corp., basic	$ 36	$ 66
Net income attributable to change in ownership percentage due to dilutive equity awards	2	4
Less: Provision for income tax expense	0	0
Net income attributable to McAfee Corp., diluted	$ 38	$ 70
Weighted average shares of Class A common stock outstanding, basic	165.0	163.7
Dilutive impact of equity awards	17.8	15.8
Weighted average shares of Class A common stock outstanding, diluted	182.8	179.5
Earnings per share attributable to McAfee Corp., basic:
Earnings per share, basic	$ 0.22	$ 0.40
Earnings per share attributable to McAfee Corp., diluted:
Earnings per share, diluted	$ 0.21	$ 0.39
Class A Common Stock
Earnings Per Share [Line Items]
Weighted average shares of Class A common stock outstanding, basic	165.0	163.7
Weighted average shares of Class A common stock outstanding, diluted	182.8	179.5
Continuing Operations
Earnings Per Share [Line Items]
Net income attributable to McAfee Corp., basic	$ 23	$ 50
Net income attributable to change in ownership percentage due to dilutive equity awards	2	4
Less: Provision for income tax expense	0	0
Net income attributable to McAfee Corp., diluted	$ 25	$ 54
Dilutive impact of equity awards	17.8	15.8
Earnings per share attributable to McAfee Corp., basic:
Earnings per share, basic	$ 0.14	$ 0.31
Earnings per share attributable to McAfee Corp., diluted:
Earnings per share, diluted	$ 0.14	$ 0.30
Continuing Operations | Class A Common Stock
Earnings Per Share [Line Items]
Weighted average shares of Class A common stock outstanding, basic	165.0	163.7
Weighted average shares of Class A common stock outstanding, diluted	182.8	179.5
Discontinued Operations
Earnings Per Share [Line Items]
Net income attributable to McAfee Corp., basic	$ 13	$ 16
Net income attributable to change in ownership percentage due to dilutive equity awards	0	0
Less: Provision for income tax expense	0	0
Net income attributable to McAfee Corp., diluted	$ 13	$ 16
Dilutive impact of equity awards	17.8	15.8
Earnings per share attributable to McAfee Corp., basic:
Earnings per share, basic	$ 0.08	$ 0.10
Earnings per share attributable to McAfee Corp., diluted:
Earnings per share, diluted	$ 0.07	$ 0.09
Discontinued Operations | Class A Common Stock
Earnings Per Share [Line Items]
Weighted average shares of Class A common stock outstanding, basic	165.0	163.7
Weighted average shares of Class A common stock outstanding, diluted	182.8	179.5