Retirement Plans (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Supplementary Retirement Plan) (Details) - Supplemental Employee Retirement Plan - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Projected benefit obligation, beginning of year	$ 823	$ 920
Service cost	0	0	$ 0
Interest cost	22	31	33
Actuarial (gain) loss	26	(70)
Benefits paid	(124)	(58)
Projected benefit obligation, end of year	747	823	920
Fair value of plan assets, beginning of year	0	0
Company contributions	124	58
Fair value of plan assets, end of year	0	0	$ 0
Funded status at end of year	747	823
Accounts payable and accrued liabilities	(86)	(138)
Defined Benefit Pension Plan, Liabilities, Noncurrent	(661)	(685)
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(747)	(823)
Net actuarial (gain) loss	248	261
Prior service credit	8	8
Total included in accumulated other comprehensive income	$ 256	$ 269