Other Changes In Plan Assets and Benefit Obligations Recognized In Other Comprehensive Loss (Income) (Detail) (North America, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income) at beginning of year	$ (26)
Net loss (gain)	93	(26)
Accumulated other comprehensive loss (income) at end of year	67	(26)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	1
Accumulated other comprehensive loss (income) at end of year	$ 1