Reconciliation of Measure of Division Operating Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Segment Reporting Information [Line Items]
Operating income (loss)	$ 253	$ (51)	$ 325	$ 36
Asset impairments		(4)		(9)
Merger, restructuring and other operating income (expenses), net	187	(120)	143	(163)
Unallocated expenses	(17)	(34)	(40)	(55)
Interest income	6	6	12	12
Interest expense	(25)	(23)	(48)	(48)
Other income (expense), net		1		2
Income (loss) before income taxes	234	(67)	289	2
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 83	$ 107	$ 222	$ 263