Restructuring and Asset Impairment Charges (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015 USD ($) Employee	Sep. 27, 2014 USD ($)	Sep. 26, 2015 USD ($) Employee	Sep. 27, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 14	$ 20	$ 367	$ 238
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	22	0	$ 272	0
Restructuring and Related Cost, Number of Positions Eliminated | Employee			3,800
Restructuring and Related Activities, Completion Date			Dec. 26, 2015
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			$ 0
Accrued restructuring, Additional accruals			(285)
Accrued restructuring, Adjustments			(13)
Accrued restructuring, Cash payments			(178)
Accrued restructuring, Non-cash settlements			(1)
Accrued restructuring, Ending Balance	93		93
2015 Restructuring Program [Member] | Employee severance and benefit arrangements [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	20	0	270	0
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			0
Accrued restructuring, Additional accruals			(283)
Accrued restructuring, Adjustments			(13)
Accrued restructuring, Cash payments			(178)
Accrued restructuring, Non-cash settlements			0
Accrued restructuring, Ending Balance	92		92
2015 Restructuring Program [Member] | Asset Impairments and other restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2	0	2	0
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			0
Accrued restructuring, Additional accruals			(2)
Accrued restructuring, Adjustments			0
Accrued restructuring, Cash payments			0
Accrued restructuring, Non-cash settlements			(1)
Accrued restructuring, Ending Balance	1		1
2013 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(8)	20	$ 95	238
Restructuring and Related Cost, Number of Positions Eliminated | Employee			1,100
Restructuring and Related Activities, Completion Date			Dec. 26, 2015
Restructuring and Related Cost, Cost Incurred to Date	$ 630		$ 630
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employee	8,700		8,700
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			$ 132
Accrued restructuring, Additional accruals			(109)
Accrued restructuring, Adjustments			(14)
Accrued restructuring, Cash payments			(170)
Accrued restructuring, Non-cash settlements			(3)
Accrued restructuring, Ending Balance	$ 54		54
2013 Restructuring Program [Member] | Employee severance and benefit arrangements [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(9)	9	87	218
Restructuring and Related Cost, Cost Incurred to Date	553		553
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			121
Accrued restructuring, Additional accruals			(100)
Accrued restructuring, Adjustments			(13)
Accrued restructuring, Cash payments			(156)
Accrued restructuring, Non-cash settlements			0
Accrued restructuring, Ending Balance	52		52
2013 Restructuring Program [Member] | Asset Impairments and other restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1	$ 11	8	$ 20
Restructuring and Related Cost, Cost Incurred to Date	77		77
Restructuring Reserve [Roll Forward]
Accrued restructuring, Beginning Balance			11
Accrued restructuring, Additional accruals			(9)
Accrued restructuring, Adjustments			(1)
Accrued restructuring, Cash payments			(14)
Accrued restructuring, Non-cash settlements			(3)
Accrued restructuring, Ending Balance	$ 2		$ 2