Partnership Capital - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 30, 2016	Sep. 25, 2015	Dec. 31, 2015	Jan. 02, 2015	Dec. 31, 2014	Jan. 17, 2014
Partners Capital Account [Line Items]
Period of loans made by Partnership to general partners			1 year
Outstanding amount of partner loans financed through the Partnership	$ 267	$ 216	$ 267	$ 216	$ 218		$ 198
Interest income from outstanding amount of general partner loan	$ 3	$ 2	$ 8	$ 6
Limited partnership's minimum annual payment rate	7.50%	7.50%	7.50%	7.50%
Limited partnership's minimum return, value	$ 17	$ 17	$ 51	$ 52
2014 Limited Partnership Offering [Member]
Partners Capital Account [Line Items]
Limited partnership amount registered								$ 350
Limited partnership interests issued						$ 292
Remaining limited partnership interests that may be issued	$ 58		$ 58