Components of Net Periodic Pension Benefit Cost and Net Postretirement Benefit Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4	$ 4	$ 8	$ 8
Interest cost	6	7	12	14
Expected return on plan assets	(10)	(9)	(19)	(19)
Amortization of net loss (gain)	4	3	7	7
Net benefit expense (income)	4	5	8	10
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	0
Interest cost	1	0	1	0
Expected return on plan assets	0	0	0	0
Amortization of net loss (gain)	(1)	0	(1)	(1)
Net benefit expense (income)	$ 0	$ 0	$ 0	$ (1)