Benefit Plans - Net Periodic Benefit Expense and Contributions for Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 08, 2018	Sep. 09, 2017	Sep. 08, 2018	Sep. 09, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 22	$ 20	$ 50	$ 44
Expected return on assets	(31)	(33)	(71)	(73)
Amortization of prior service benefit	(1)	3	(1)	6
Amortization of net actuarial loss	3	0	7	0
Net periodic benefit expense (income)	(7)	(10)	(15)	(23)
Contributions to benefit plans	(1)	0	(6)	(1)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1	1	1
Expected return on assets	0	0	0	0
Amortization of prior service benefit	(3)	(3)	(7)	(8)
Amortization of net actuarial loss	0	0	0	1
Net periodic benefit expense (income)	(2)	(2)	(6)	(6)
Contributions to benefit plans	$ 0	$ 0	$ 0	$ 0