Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jul. 26, 2015	Jul. 31, 2016	Jul. 26, 2015
Accelerated Share Repurchases [Line Items]
Stock repurchase program, additional authorized amount		$ 1,620
Accelerated Share Repurchases, Payment			$ 500
Stock Repurchased Initial Delivery, Shares			12
Accelerated Share Repurchase Program, Adjustment		9
Accelerated Share Repurchases, Final Price Paid Per Share					$ 42.06
Stock Repurchased and Retired During Period, Shares					12
Treasury Stock, Value, Acquired, Cost Method					$ 509
Aggregate number of shares repurchased under stock repurchase program (in shares)					243
Aggregated cost of shares repurchased		4,360			$ 4,360
Stock Repurchase Program, Remaining Authorized Repurchase Amount		960			960
Dividends, Cash [Abstract]
Payments of Dividends		$ 62			$ 124	$ 99
Cash dividends declared and paid per common share		$ 0.1150		$ 0.0975	$ 0.2300	$ 0.1825
Total Return to Shareholders		$ 71			$ 633
intended return to shareholder in 2017		$ 1,000
Authorized number of shares of common stock (in shares)		2,000			2,000
Par value of common stock		$ 0.001			$ 0.001
Subsequent Event [Member]
Dividends, Cash [Abstract]
Cash dividends declared and paid per common share	$ 0.1150