Retirement Plans (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Supplementary Retirement Plan) (Details) (Supplementary Retirement Plan [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
Funded status at end of year	$ (771)	$ (688)
Accounts payable and accrued liabilities	(55)	(52)
Other liabilities	(716)	(636)
Net actuarial (gain) loss	195	113
Prior service credit	(1)	(2)
Total included in accumulated other comprehensive income	194	111
Change in projected benefit obligation [Member]
Projected benefit obligation, beginning of year	688	680
Service cost	6	6
Interest cost	36	37
Actuarial loss	90	22
Benefits paid	(49)	(57)
Projected benefit obligation, end of year	771	688
Fair value of plan assets [Member]
Benefits paid	(49)	(57)
Fair value of plan assets, beginning of year	0	0
Company contributions	49	57
Fair value of plan assets, end of year	$ 0	$ 0