Pension and Postretirement Plans (Net Benefit Expense (Income)) (Details) - Pension Benefits [Member] - USD ($) $ in Millions	3 Months Ended
	May 04, 2019	May 05, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 5
Interest cost	7	6
Expected return on plan assets	(9)	(10)
Amortization of net loss (gain)	3	3
Net benefit expense (income)	$ 6	$ 4