Merger, Restructuring and Other Accruals - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014 Store	Dec. 28, 2013	Dec. 29, 2012
Merger Restructuring And Other Operating Expenses [Line Items]
Number of retail stores expected to be closed									232
Merger restructuring and other expenses	$ 128	$ 72	$ 103	$ 101	$ 111	$ 44	$ 26	$ 19	$ 403	$ 201	$ 56
Charges Incurred									266	98
Non-cash expense not associated with merger and restructuring									137	103
European restructuring transaction and integration expenses									124	80
Employee non-cash equity compensation expenses									20	5
Fixed assets and rent related non-cash expenses										1
Other related expenses									3
Merger, Restructuring and Other Operating Expenses, Net
Merger Restructuring And Other Operating Expenses [Line Items]
Charges Incurred									266	98
European restructuring plan
Merger Restructuring And Other Operating Expenses [Line Items]
Expected cash expenditures related to restructuring expenses during 2014 and 2015									112
Anticipated restructuring expenses	120								120
Total estimated expenses incurred									37
European restructuring plan | Employee Severance And Termination Benefits
Merger Restructuring And Other Operating Expenses [Line Items]
Anticipated restructuring expenses	95								95
European restructuring plan | Lease Obligations and Other Costs
Merger Restructuring And Other Operating Expenses [Line Items]
Anticipated restructuring expenses	25								25
United States
Merger Restructuring And Other Operating Expenses [Line Items]
Number of retail stores closed									168
European restructuring plan
Merger Restructuring And Other Operating Expenses [Line Items]
European restructuring transaction and integration expenses										$ 9