Reconciliation of Measure of Division Operating Income to Consolidated Loss Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Total Divisions operating income	$ 102	$ 108	$ (273)	$ 117
Asset impairments	(10)	(5)	(423)	(50)
Merger and restructuring expenses, net	(26)	(22)	(107)	(105)
Unallocated expenses	(29)	(23)	(75)	(80)
Interest income		5	3	16
Interest expense	(6)	(22)	(35)	(68)
Loss on extinguishment and modification of debt			(12)
Other income, net	3	2	7	7
Income (loss) before income taxes	99	93	(310)	72
Operating Segments
Segment Reporting Information [Line Items]
Total Divisions operating income	$ 167	$ 158	$ 332	$ 352