Segment Information - Financial Information for Partnership's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Net revenue:
Total net revenue	$ 2,083	$ 1,882	$ 4,125	$ 3,679
Pre-variable income:
Total pre-variable income	489	438	958	799
Variable compensation:
Total variable compensation	249	213	485	377
Income (loss) before allocations to partners:
Total income before allocations to partners	240	225	473	422
United States [Member]
Net revenue:
Total net revenue	2,026	1,833	4,010	3,582
Pre-variable income:
Total pre-variable income	487	436	953	798
Variable compensation:
Total variable compensation	243	209	473	369
Income (loss) before allocations to partners:
Total income before allocations to partners	244	227	480	429
Canada [Member]
Net revenue:
Total net revenue	57	49	115	97
Pre-variable income:
Total pre-variable income	2	2	5	1
Variable compensation:
Total variable compensation	6	4	12	8
Income (loss) before allocations to partners:
Total income before allocations to partners	$ (4)	$ (2)	$ (7)	$ (7)