Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Pension Plan [Member]
Service cost	$ 28	$ 30	$ 56	$ 58
Interest cost	35	39	71	78
Expected return on assets	(61)	(63)	(121)	(126)
Recognition of net actuarial (gain) loss	36	36	71	71
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	38	42	77	81
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Service cost	1	1	3	3
Interest cost	8	9	16	17
Recognition of net actuarial (gain) loss	6	5	10	9
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	15	15	29	29
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	0	0	0	0
Interest cost	2	3	5	6
Recognition of net actuarial (gain) loss	(1)	(1)	(2)	(2)
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1	$ 2	$ 3	$ 4