Reserves for Closed Properties and Property, Plant and Equipment-Related Impairment Charges - Summary of Fair Values for Property, Plant and Equipment Assets Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 12, 2015	Sep. 06, 2014	Sep. 12, 2015	Sep. 06, 2014
Property, Plant and Equipment [Abstract]
Carrying value	$ 1	$ 2	$ 3	$ 2
Fair value measured using Level 3 inputs	0	1	2	1
Impairment charge	$ 1	$ 1	$ 1	$ 1