Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 04, 2013	Apr. 28, 2012
Pension Plan [Member]
Service cost	$ 28	$ 28
Interest cost	36	39
Expected return on assets	(60)	(63)
Amortization of net actuarial (gain) loss	35	35
Amortization of prior service credit	0	0
Total net periodic benefit cost	39	39
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Service cost	2	2
Interest cost	8	8
Amortization of net actuarial (gain) loss	4	4
Amortization of prior service credit	0	0
Total net periodic benefit cost	14	14
Amount Recognized In Net Periodic Postretirement Benefit Cost [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	0	0
Interest cost	3	3
Amortization of net actuarial (gain) loss	(1)	(1)
Amortization of prior service credit	0	0
Total net periodic benefit cost	$ 2	$ 2