Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
401(k) defined contribution plan expense	$ 24	$ 25	$ 47	$ 50
Total Retirement Expense	20	18	41	37
Pension Plan [Member]
Service cost	1	1	3	3
Interest cost	34	37	68	75
Expected return on assets	(58)	(62)	(117)	(123)
Recognition of net actuarial (gain) loss	9	7	19	13
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	(14)	(17)	(27)	(32)
Supplemental Employee Retirement Plan [Member]
Service cost	0	0	0	0
Interest cost	8	9	16	17
Recognition of net actuarial (gain) loss	2	1	5	2
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	10	10	21	19
Other Postretirement Benefit Plan [Member]
Service cost	0	0	0	0
Interest cost	2	2	4	4
Recognition of net actuarial (gain) loss	0	(1)	0	(2)
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 2	$ 1	$ 4	$ 2