Benefit Plans - Net Periodic Benefit Expense and Contributions for Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) - USD ($) $ in Millions	4 Months Ended
	Jun. 20, 2015	Jun. 14, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	33	39
Expected return on assets	(44)	(47)
Amortization of prior service benefit	0	0
Amortization of net actuarial loss	24	19
Net periodic benefit expense (income)	13	11
Contributions to benefit plans	(26)	(45)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on assets	0	0
Amortization of prior service benefit	(4)	(4)
Amortization of net actuarial loss	2	1
Net periodic benefit expense (income)	(1)	(2)
Contributions to benefit plans	$ (11)	$ 0