Partnership Capital Subject to Mandatory Redemption - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 26, 2021	Mar. 27, 2020	Dec. 31, 2020	Jan. 29, 2021	Jan. 31, 2020	Dec. 31, 2019	Jan. 12, 2018
Partners Capital Account [Line Items]
Period of loans made by Partnership to general partners	1 year		1 year
Percentage of interest made by partnership to general partners	3.25%		3.25%
Outstanding amount of partner loans financed through the Partnership	$ 438	$ 423	$ 341			$ 360
Interest income from outstanding amount of general partner loan	$ 3	$ 5
Limited partnership's minimum annual return rate	7.50%	7.50%
Limited partnership's minimum return, value	$ 23	$ 23
2018 Limited Partnership Offering [Member]
Partners Capital Account [Line Items]
Limited partnership amount registered							$ 450
Limited partnership interests issued				$ 3	$ 1
Remaining limited partnership interests that may be issued	$ 66