Reconciliation of Measure of Division Operating Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Segment Reporting Information [Line Items]
Operating income	$ 46	$ 271	$ 173	$ 356
Asset impairments	(1)		(1)
Merger, restructuring and other operating income (expenses), net	(20)	193	(40)	154
Unallocated expenses	(16)	(17)	(38)	(41)
Interest income	6	6	12	11
Interest expense	(14)	(23)	(27)	(44)
Other expense, net	(3)		(2)
Income from continuing operations before income taxes	35	254	156	323
Operating Segments
Segment Reporting Information [Line Items]
Operating income	$ 83	$ 95	$ 252	$ 243