Components of Net Periodic Pension Benefit Cost and Net Postretirement Benefit Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 02, 2015	May 03, 2014
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4	$ 4
Interest cost	6	7
Expected return on plan assets	(9)	(10)
Amortization of net loss (gain)	3	4
Net benefit expense (income)	4	5
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0
Interest cost	0	0
Expected return on plan assets	0	0
Amortization of net loss (gain)	0	(1)
Net benefit expense (income)	$ 0	$ (1)