Postretirement Health Care and Life Insurance Benefits (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Postretirement Obligations) (Details) (Postretirement Obligations, USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Jan. 28, 2012
Funded status at end of year	$ (250)	$ (266)
Accounts payable and accrued liabilities	(28)	(29)
Other liabilities	(222)	(237)
Net actuarial (gain) loss	(23)	(23)
Change in projected benefit obligation [Member]
Projected benefit obligation, beginning of year	266	278
Service cost	0	0
Interest cost	12	14
Actuarial loss	(4)	(3)
Medicare Part D subsidy	1	2
Benefits paid	(25)	(25)
Projected benefit obligation, end of year	250	266
Fair value of plan assets [Member]
Benefits paid	(25)	(25)
Fair value of plan assets, beginning of year	0	0
Company contributions	25	25
Fair value of plan assets, end of year	$ 0	$ 0