Restructuring And Asset Impairment Charges (Detail) $ in Millions	12 Months Ended
	Dec. 26, 2015 USD ($) Employee	Dec. 27, 2014 USD ($)	Dec. 28, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 354	$ 295	$ 240
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Activities, Completion Date	Dec. 26, 2015
Restructuring and Related Cost, Incurred Cost	$ 264	0	0
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employee	4,000
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 0
Restructuring Reserve, Additional accruals	306
Restructuring Reserve, Adjustments	(42)
Restructuring Reserve, Cash payments	(226)
Restructuring Reserve, Non-cash settlements	(6)
Restructuring Reserve, Ending Balance	32	0
2015 Restructuring Program [Member] | Employee severance and benefit arrangements [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	250
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0
Restructuring Reserve, Additional accruals	292
Restructuring Reserve, Adjustments	(42)
Restructuring Reserve, Cash payments	(225)
Restructuring Reserve, Non-cash settlements	0
Restructuring Reserve, Ending Balance	25	0
2015 Restructuring Program [Member] | Asset impairments and other restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	14
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0
Restructuring Reserve, Additional accruals	14
Restructuring Reserve, Adjustments	0
Restructuring Reserve, Cash payments	(1)
Restructuring Reserve, Non-cash settlements	(6)
Restructuring Reserve, Ending Balance	$ 7	0
2013 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Activities, Completion Date	Dec. 26, 2015
Restructuring and Related Cost, Incurred Cost	$ 90	295	240
Restructuring and Related Cost, Number of Positions Eliminated | Employee	940
Restructuring and Related Cost, Cost Incurred to Date	$ 625
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employee	8,500
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 132	183
Restructuring Reserve, Additional accruals	110	283
Restructuring Reserve, Adjustments	(20)	12
Restructuring Reserve, Cash payments	(181)	(333)
Restructuring Reserve, Non-cash settlements	(3)	(13)
Restructuring Reserve, Ending Balance	38	132	183
2013 Restructuring Program [Member] | Employee severance and benefit arrangements [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	82	265	201
Restructuring and Related Cost, Cost Incurred to Date	548
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	121	183
Restructuring Reserve, Additional accruals	101	252
Restructuring Reserve, Adjustments	(19)	13
Restructuring Reserve, Cash payments	(171)	(327)
Restructuring Reserve, Non-cash settlements	0	0
Restructuring Reserve, Ending Balance	32	121	183
2013 Restructuring Program [Member] | Asset impairments and other restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	8	30	39
Restructuring and Related Cost, Cost Incurred to Date	77
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	11	0
Restructuring Reserve, Additional accruals	9	31
Restructuring Reserve, Adjustments	(1)	(1)
Restructuring Reserve, Cash payments	(10)	(6)
Restructuring Reserve, Non-cash settlements	(3)	(13)
Restructuring Reserve, Ending Balance	$ 6	$ 11	$ 0