Components of Net Periodic Pension Benefit Cost and Net Postretirement Benefit Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 03, 2014	May 04, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4
Interest cost	7	6
Expected return on plan assets	(10)	(10)
Amortization of net loss (gain)	4	4
Net benefit expense (income)	5	4
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	0	0
Expected return on plan assets	0	0
Amortization of net loss (gain)	(1)	(1)
Net benefit expense (income)	$ (1)	$ (1)