Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 02, 2015	May 03, 2014
401(k) defined contribution plan expense	$ 23	$ 25
Total Retirement Expense	21	19
Pension Plan [Member]
Service cost	2	2
Interest cost	34	38
Expected return on assets	(59)	(61)
Recognition of net actuarial (gain) loss	10	6
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	(13)	(15)
Supplemental Employee Retirement Plan [Member]
Service cost	0	0
Interest cost	8	8
Recognition of net actuarial (gain) loss	3	1
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	11	9
Other Postretirement Benefit Plan [Member]
Service cost	0	0
Interest cost	2	2
Recognition of net actuarial (gain) loss	0	(1)
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 2	$ 1