Postretirement Health Care and Life Insurance Benefits (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Postretirement Obligations) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Projected benefit obligation, beginning of year	$ 186	$ 212
Service cost	0	0	$ 0
Interest cost	5	6	8
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(10)	0
Actuarial (gain) loss	(9)	(13)
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	1	1
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(17)	(20)
Projected benefit obligation, end of year	156	186	212
Fair value of plan assets, beginning of year	0	0
Company contributions	17	20
Fair value of plan assets, end of year	0	0	$ 0
Funded status at end of year	156	186
Accounts payable and accrued liabilities	(17)	(18)
Other liabilities	(139)	(168)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(156)	(186)
Net actuarial (gain) loss	(35)	(31)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(10)	0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(45)	$ (31)
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 6