Pension and Postretirement Plans (Net Benefit Expense (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 4	$ 14	$ 12
Interest cost	8	6	21	19
Expected return on plan assets	(10)	(9)	(29)	(28)
Amortization of net loss (gain)	3	3	9	10
Net benefit expense (income)	$ 6	4	15	13
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)
Net benefit expense (income)			$ (1)	$ (1)