Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	9 Months Ended
	Nov. 30, 2016	Oct. 29, 2016	Oct. 31, 2015	Apr. 30, 2016	Jan. 30, 2016	Aug. 01, 2015	May 02, 2015
February 2016 Repurchase Program [Member]
Amount Authorized				$ 500
Shares Repurchased		5,270
Amount Repurchased		$ 410
Average Stock Price of Shares Repurchased within Program		$ 77.75
Remaining authorized repurchase amount		$ 90
June 2015 Repurchase Program [Member]
Amount Authorized						$ 250
Shares Repurchased			1,375
Amount Repurchased			$ 113
Average Stock Price of Shares Repurchased within Program			$ 82.31
Remaining authorized repurchase amount				$ 17
February 2015 Repurchase Program [Member] [Member]
Amount Authorized							$ 250
Shares Repurchased			2,788
Amount Repurchased			$ 250
Average Stock Price of Shares Repurchased within Program			$ 89.45
Accounts Payable [Member] | February 2016 Repurchase Program [Member]
Share repurchase reflected in Accounts payable		$ 0
Accounts Payable [Member] | June 2015 Repurchase Program [Member]
Share repurchase reflected in Accounts payable			$ 0		$ 0
Subsequent Event [Member] | February 2016 Repurchase Program [Member]
Shares Repurchased	200
Amount Repurchased	$ 11