Benefit Plans - Net Periodic Benefit Expense and Contributions for Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	4 Months Ended
	Jun. 14, 2014	Jun. 15, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	39	37
Expected return on assets	(47)	(43)
Amortization of prior service benefit
Amortization of net actuarial loss	19	31
Net periodic benefit expense	11	25
Contributions to benefit plans	(45)	(71)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1
Interest cost	1	1
Expected return on assets
Amortization of prior service benefit	(4)	(4)
Amortization of net actuarial loss	1	2
Net periodic benefit expense	(2)
Contributions to benefit plans		$ (1)