Segment Information (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Aug. 04, 2018 USD ($)	Jul. 29, 2017 USD ($)	Aug. 04, 2018 USD ($) segment	Jul. 29, 2017 USD ($)	Feb. 03, 2018 segment
Segment Information [Abstract]
Number of reportable segments | segment				1		2
Pension litigation charge | $	[1]	$ (3)	$ (50)	$ (15)	$ (50)

[1] Included in the thirteen and twenty-six weeks ended August 4, 2018 are pre-tax charges of $3 million and $15 million, respectively, relating to a pension litigation matter described further in Note 14, Legal Proceedings. Included in the thirteen and twenty-six weeks ended July 29, 2017 are pre-tax charges of $50 million in both periods relating to the same matter.