Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Jul. 30, 2016	Aug. 01, 2015
Total Retirement Expense	$ 12	$ 21	$ 25	$ 42
Settlement charges	6	0	19	0
Pension Plan [Member]
Service cost	1	1	2	3
Interest cost	28	34	56	68
Expected return on assets	(58)	(58)	(114)	(117)
Recognition of net actuarial (gain) loss	7	9	15	19
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	(22)	(14)	(41)	(27)
Supplemental Employee Retirement Plan [Member]
Service cost	0	0	0	0
Interest cost	6	8	12	16
Recognition of net actuarial (gain) loss	2	2	4	5
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	8	10	16	21
Other Postretirement Benefit Plan [Member]
Service cost	0	0	0	0
Interest cost	1	2	3	4
Recognition of net actuarial (gain) loss	(1)	0	(2)	0
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	0	2	1	4
Defined Contribution Qualified Plan [Member]
Defined contribution plans expense	25	24	49	47
Non qualified defined contribution plan [Member]
Defined contribution plans expense	$ 1	$ 1	$ 1	$ 1