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. 17, 2017	Jun. 18, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 24	$ 26
Expected return on assets	(40)	(44)
Amortization of prior service benefit	0	0
Amortization of net actuarial loss	3	14
Net periodic benefit income	(13)	(4)
Contributions to benefit plans	(1)	(1)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	1
Expected return on assets	0	0
Amortization of prior service benefit	(5)	(5)
Amortization of net actuarial loss	1	1
Net periodic benefit income	(4)	(3)
Contributions to benefit plans	$ 0	$ 0