Benefit Plans - Net Periodic Benefit Expense for Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	4 Months Ended
	Jun. 15, 2013	Jun. 16, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 37	$ 38
Expected return on assets	(43)	(41)
Amortization of net actuarial loss	31	34
Net periodic benefit expense	25	31
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	1	2
Amortization of prior service benefit	(4)	(4)
Amortization of net actuarial loss	2	2
Net periodic benefit expense		$ 1