Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Pension Plan [Member]
Service cost	$ 1	$ 28	$ 3	$ 56
Interest cost	37	35	75	71
Expected return on assets	(62)	(61)	(123)	(121)
Recognition of net actuarial (gain) loss	7	36	13	71
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	(17)	38	(32)	77
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Service cost	0	1	0	3
Interest cost	9	8	17	16
Recognition of net actuarial (gain) loss	1	6	2	10
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	10	15	19	29
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	0	0	0	0
Interest cost	2	2	4	5
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	$ 1	$ 2	$ 3