Amounts Recognized in Consolidated Balance Sheets Related to Defined Benefit Pension and Other Postretirement Benefit Plans (Detail) (North America, USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets		$ 10
Current liabilities	(3)	(3)
Noncurrent liabilities	(176)	(143)
Net amount recognized	(179)	(136)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(1)	(1)
Noncurrent liabilities	(16)	(16)
Net amount recognized	$ (17)	$ (17)