Reconciliation of Fair Value of U.S. Pension Plan's Real Estate Investments Classified as Level 3 (Detail) (U.S. Qualified Pension Plan, USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets at end of year	$ 546	$ 511	[1]
Other types of investments | Real Estate
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets at end of year	8	9	[1]
Level 3 | Other types of investments | Real Estate
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets at beginning of year	9	7
Unrealized loss on appraised value of real estate	(1)
Changes during the year		2
Fair value of plan assets at end of year	$ 8	$ 9

[1] Each category of plan assets is classified within the same level of the fair value hierarchy for 2011 and 2010.