Debt And Credit Facilities (Components Of Interest Expense, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Debt Disclosure [Abstract]
Interest on long-term debt and short-term borrowings	$ 147	$ 153	$ 156
Less:
Interest income	(1)	0	(1)
Capitalized interest	(25)	(28)	(17)
Interest expense, net	$ 121	$ 125	$ 138