Pension and Other Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4	$ 3	$ 9	$ 7
Interest cost	7	10	13	21
Expected return on plan assets	(15)	(17)	(29)	(34)
Amortization of unrecognized losses and prior service costs	4	4	7	7
Total cost	0	0	0	1
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	1
Interest cost	1	0	2	1
Expected return on plan assets	0	0	0	0
Amortization of unrecognized losses and prior service costs	0	1	0	1
Total cost	$ 1	$ 1	$ 2	$ 3