Components of Net Periodic Pension Benefit Cost and Net Postretirement Benefit Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 5	$ 3	$ 13	$ 11
Interest cost	6	7	18	21
Expected return on plan assets	(10)	(9)	(29)	(28)
Amortization of net loss (gain)	3	5	10	12
Net benefit expense (income)	4	6	12	16
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	0
Interest cost	0	0	1	0
Expected return on plan assets	0	0	0	0
Amortization of net loss (gain)	0	(1)	(1)	(2)
Net benefit expense (income)	$ 0	$ (1)	$ 0	$ (2)