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. 16, 2018	Jun. 17, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 28	$ 24
Expected return on assets	(40)	(40)
Amortization of prior service benefit	0	0
Amortization of net actuarial loss	4	3
Net periodic benefit expense (income)	(8)	(13)
Contributions to benefit plans	(5)	(1)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0
Expected return on assets	0	0
Amortization of prior service benefit	(4)	(5)
Amortization of net actuarial loss	0	1
Net periodic benefit expense (income)	(4)	(4)
Contributions to benefit plans	$ 0	$ 0