Net Benefit Expense (Income) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 13	$ 11
Interest cost	32	33	36
Expected return on plan assets	(40)	(40)	(43)
Amortization of prior service cost			1
Amortization of net loss (gain)	15	17	13
Net benefit expense (income)	19	23	18
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1		1
Amortization of prior service cost	(1)
Amortization of net loss (gain)	(5)	(6)	(7)
Net benefit expense (income)	$ (5)	$ (6)	$ (6)