Severance and Facility Closure Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 207	$ 178
Charges Incurred	241	266
Cash Payments	(189)	(239)
Currency, Lease Accretion, and Other Adjustments		2
Ending Balance	259	207
Termination benefits | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	31	23
Charges Incurred	16	99
Cash Payments	(31)	(91)
Ending Balance	16	31
Termination benefits | Other restructuring accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	8	5
Charges Incurred	7	23
Cash Payments	(14)	(21)
Currency, Lease Accretion, and Other Adjustments		1
Ending Balance	1	8
Termination benefits | Acquired entity accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance		4
Cash Payments		(2)
Currency, Lease Accretion, and Other Adjustments		(2)
Termination benefits | European restructuring plan
Restructuring Cost and Reserve [Line Items]
Beginning Balance	26
Charges Incurred	53	26
Cash Payments	(32)
Currency, Lease Accretion, and Other Adjustments	(5)
Ending Balance	42	26
Lease and contract obligations, accruals for facilities closures and other costs | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	71	25
Charges Incurred	76	111
Cash Payments	(70)	(65)
Ending Balance	77	71
Lease and contract obligations, accruals for facilities closures and other costs | Other restructuring accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	35	62
Charges Incurred	4	5
Cash Payments	(17)	(33)
Currency, Lease Accretion, and Other Adjustments	3	1
Ending Balance	25	35
Lease and contract obligations, accruals for facilities closures and other costs | Acquired entity accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	36	59
Charges Incurred	3
Cash Payments	(15)	(25)
Currency, Lease Accretion, and Other Adjustments	1	2
Ending Balance	25	36
Lease and contract obligations, accruals for facilities closures and other costs | Acquired Entities
Restructuring Cost and Reserve [Line Items]
Charges Incurred	72
Ending Balance	72
Lease and contract obligations, accruals for facilities closures and other costs | European restructuring plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred	10	2
Cash Payments	(10)	$ (2)
Currency, Lease Accretion, and Other Adjustments	1
Ending Balance	$ 1