Pension and Postretirement Plans (Net Benefit Expense (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Jul. 30, 2016	Aug. 01, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4	$ 8	$ 8
Interest cost	7	6	13	12
Expected return on plan assets	(9)	(10)	(18)	(19)
Amortization of net loss (gain)	3	4	7	7
Net benefit expense (income)	$ 5	4	10	8
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost		1		1
Expected return on plan assets
Amortization of net loss (gain)		(1)	(1)	$ (1)
Net benefit expense (income)			$ (1)