Reconciliation of Measure of Division Operating Income to Consolidated Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Segment Reporting Information [Line Items]
Operating income (loss)	$ 51	$ 49	$ 88	$ (214)
Other operating income		1		8
Asset impairments	(1)	(6)	(10)	(77)
Merger, restructuring, and other operating expenses, net	(111)	(72)	(274)	(276)
Legal accrual		(1)		(81)
Unallocated expenses	(24)	(29)	(79)	(88)
Interest income	6	6	18	18
Interest expense	(22)	(25)	(71)	(65)
Other income (expense), net	(1)	1	1	(1)
Income (loss) before income taxes	34	31	36	(262)
Division Operating Income
Segment Reporting Information [Line Items]
Operating income (loss)	$ 187	$ 156	$ 451	$ 300