Fair Values of Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2015		Feb. 01, 2014
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Cash and cash equivalents	$ 3		$ 0	[1]
Equity Securities | Canadian and International
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	5	[2]	5	[1],[2]
Fixed-income securities | Cash matched bonds
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	65	[3]	70	[1],[3]
Canadian Qualified Pension Plan
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	73		75	[1]
Level 1
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Cash and cash equivalents	0
Level 1 | Equity Securities | Canadian and International
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	5	[2]
Level 1 | Fixed-income securities | Cash matched bonds
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	0	[3]
Level 1 | Canadian Qualified Pension Plan
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	5
Level 2
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Cash and cash equivalents	3
Level 2 | Equity Securities | Canadian and International
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	0	[2]
Level 2 | Fixed-income securities | Cash matched bonds
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	65	[3]
Level 2 | Canadian Qualified Pension Plan
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	68
Level 3
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Cash and cash equivalents	0
Level 3 | Equity Securities | Canadian and International
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	0	[2]
Level 3 | Fixed-income securities | Cash matched bonds
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	0	[3]
Level 3 | Canadian Qualified Pension Plan
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items]
Pension plan assets at fair value	$ 0

[1] Each category of plan assets is classified within the same level of the fair value hierarchy for 2014 and 2013.

[2] This category comprises one mutual fund that invests primarily in a diverse portfolio of Canadian securities.

[3] This category consists of fixed-income securities, including strips and coupons, issued or guaranteed by the Government of Canada, provinces or municipalities of Canada including their agencies and crown corporations, as well as other governmental bonds and corporate bonds.