Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 25, 2015	Jul. 26, 2015	Apr. 26, 2015	Jan. 25, 2015	Oct. 26, 2014	Jul. 27, 2014	Apr. 27, 2014	Jan. 26, 2014	Oct. 25, 2015	Oct. 26, 2014	Oct. 27, 2013
Numerator:
Net income	$ 336	$ 329	$ 364	$ 348	$ 256	$ 301	$ 262	$ 253	$ 1,377	$ 1,072	$ 256
Denominator:
Weighted average common shares outstanding									1,214	1,215	1,202
Effect of dilutive stock options, restricted stock units and employee stock purchase plan shares									12	16	17
Denominator for diluted earnings per share									1,226	1,231	1,219
Basic earnings per share (in dollars per share)									$ 1.13	$ 0.88	$ 0.21
Diluted earnings per share (in dollars per share)	$ 0.28	$ 0.27	$ 0.29	$ 0.28	$ 0.21	$ 0.24	$ 0.21	$ 0.21	$ 1.12	$ 0.87	$ 0.21
Potentially dilutive securities									0	1	2