Pension and Postretirement Plans (Net Benefit Expense (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4	$ 9	$ 8
Interest cost	7	7	13	13
Expected return on plan assets	(9)	(10)	(19)	(19)
Amortization of net loss (gain)	3	4	6	7
Net benefit expense (income)	5	5	9	9
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost
Expected return on plan assets
Amortization of net loss (gain)	(1)	(1)	(1)	(1)
Net benefit expense (income)	$ (1)	$ (1)	$ (1)	$ (1)