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. 09, 2017	Sep. 10, 2016	Sep. 09, 2017	Sep. 10, 2016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 20	$ 20	$ 44	$ 46
Expected return on assets	(33)	(33)	(73)	(77)
Amortization of prior service benefit	3	0	6	0
Amortization of net actuarial loss	0	10	0	24
Net periodic benefit income	(10)	(3)	(23)	(7)
Contributions to benefit plans	0	(1)	(1)	(2)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	0	1	1
Expected return on assets	0	0	0	0
Amortization of prior service benefit	(3)	(3)	(8)	(8)
Amortization of net actuarial loss	0	0	1	1
Net periodic benefit income	(2)	(3)	(6)	(6)
Contributions to benefit plans	$ 0	$ 0	$ 0	$ 0