Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Pension Plan [Member]
Service cost	$ 2	$ 28	$ 5	$ 84
Interest cost	38	36	113	107
Expected return on assets	(62)	(60)	(185)	(181)
Recognition of net actuarial (gain) loss	6	34	19	105
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	(16)	38	(48)	115
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Service cost	0	2	0	5
Interest cost	8	8	25	24
Recognition of net actuarial (gain) loss	1	4	3	14
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	9	14	28	43
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	0	0	0	0
Interest cost	3	2	7	7
Recognition of net actuarial (gain) loss	(2)	0	(4)	(2)
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1	$ 2	$ 3	$ 5