Segment Information - Financial Information for Partnership's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Net revenue:
Total net revenue	$ 2,325	$ 2,319	$ 4,816	$ 4,509
Pre-variable income (loss):
Total pre-variable income	578	564	1,219	1,051
Variable compensation:
Total variable compensation	290	279	628	525
Income (loss) before allocations to partners:
Total income before allocations to partners	288	285	591	526
United States [Member]
Net revenue:
Total net revenue	2,261	2,256	4,684	4,391
Pre-variable income (loss):
Total pre-variable income	569	557	1,205	1,045
Variable compensation:
Total variable compensation	283	273	614	513
Income (loss) before allocations to partners:
Total income before allocations to partners	286	284	591	532
Canada [Member]
Net revenue:
Total net revenue	64	63	132	118
Pre-variable income (loss):
Total pre-variable income	9	7	14	6
Variable compensation:
Total variable compensation	7	6	14	12
Income (loss) before allocations to partners:
Total income before allocations to partners	$ 2	$ 1	$ 0	$ (6)