Shareholders' Equity (Details Textual) - USD ($) shares in Millions		3 Months Ended
		May 04, 2018	May 05, 2017	Jan. 26, 2018	Jan. 27, 2017
Share Repurchases
Share repurchases, shares		8.8	15.4
Share repurchases, value	[1]	$ 758,000,000	$ 1,264,000,000
Share Repurchase Program
Share Repurchases
Remaining share repurchases authorization, value		$ 6,200,000,000
Share repurchases, shares		8.7	15.2
Share repurchases, value	[1]	$ 750,000,000	$ 1,250,000,000
January 27, 2017 Share Repurchase Authorization
Share Repurchases
Share repurchases authorized, value					$ 5,000,000,000.0
January 26, 2018 Share Repurchase Authorization
Share Repurchases
Share repurchases authorized, value				$ 5,000,000,000.0
Open market purchases
Share Repurchases
Share repurchases, shares		8.7
Share repurchases, value		$ 750,000,000

[1] Reductions of $703 million and $1.2 billion were recorded to retained earnings, after capital in excess of par value was depleted, for the three months ended May 4, 2018 and May 5, 2017, respectively.