Leases - Schedule of Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Jun. 26, 2021	Dec. 26, 2020
Leases [Abstract]
Other long-term assets	$ 31	$ 33
Lease liabilities, current portion	9	10
Other long-term liabilities	$ 34	$ 37
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	mcfe:OtherLongTermLiabilitiesMember	mcfe:OtherLongTermLiabilitiesMember
Total lease liabilities	$ 43	$ 47
Weighted Average Remaining Lease Term (in years)	8 years	8 years
Weighted Average Discount Rate (percentage)	6.10%	6.30%