Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 27, 2013	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 27, 2013	Oct. 28, 2012	Oct. 30, 2011
Numerator:
Net income (in dollars)	$ 183	$ 168	$ (129)	$ 34	$ (515)	$ 218	$ 289	$ 117	$ 256	$ 109	$ 1,926
Denominator:
Weighted average common shares outstanding									1,202	1,266	1,319
Effect of dilutive stock options, restricted stock units and employee stock purchase plans shares									17	11	11
Denominator for diluted earnings per share									1,219	1,277	1,330
Basic earnings per share (in dollars per share)									$ 0.21	$ 0.09	$ 1.46
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.14	$ (0.11)	$ 0.03	$ (0.42)	$ 0.17	$ 0.22	$ 0.09	$ 0.21	$ 0.09	$ 1.45
Potentially dilutive securities									2	9	16