Postretirement Health Care and Life Insurance Benefits (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Postretirement Obligations) (Details) (Other Postretirement Benefit Plan [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Other Postretirement Benefit Plan [Member]
Projected benefit obligation, beginning of year	$ 223	$ 250
Service cost	0	0	0
Interest cost	10	10	12
Actuarial (gain) loss	30	(15)
Medicare Part D subsidy	1	1
Benefits paid	(21)	(23)
Projected benefit obligation, end of year	243	223	250
Fair value of plan assets, beginning of year	0	0
Company contributions	21	23
Fair value of plan assets, end of year	0	0	0
Funded status at end of year	243	223
Accounts payable and accrued liabilities	(22)	(26)
Other liabilities	(221)	(197)
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(243)	(223)
Net actuarial (gain) loss	$ 0	$ (35)