Reconciliation of Measure of Division Operating Income to Consolidated Loss Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Total Divisions operating income	$ (456)	$ (15)	$ (376)	$ 9
Asset impairments	(401)	(16)	(413)	(45)
Merger and restructuring expenses, net	(65)	(69)	(81)	(83)
Unallocated expenses	(25)	(26)	(48)	(58)
Interest income		5	3	11
Interest expense	(11)	(23)	(29)	(46)
Loss on extinguishment and modification of debt	(12)		(12)
Other income, net	4	2	5	5
Loss before income taxes	(475)	(31)	(409)	(21)
Operating Segments
Segment Reporting Information [Line Items]
Total Divisions operating income	$ 35	$ 96	$ 166	$ 195