Cash, Cash Equivalents and Investments (Details) (USD $) In Millions, unless otherwise specified	Jul. 27, 2014		Oct. 27, 2013	Jul. 28, 2013	Oct. 28, 2012
Summary of Cash, Cash Equivalents and Investments
Cash	$ 745		$ 611
Cash equivalents:
Money market funds	1,978		1,095
Municipal securities	3		5
Total Cash equivalents	1,981		1,100
Total Cash and Cash equivalents	2,726		1,711	1,745	1,392
Short-term and long-term investments, Cost	1,069		1,149
Short-term and long-term investments, Gross Unrealized Gains	35		39
Short-term and long-term investments, Gross Unrealized Losses	2		3
Short-term and long-term investments, Estimated Fair Value	1,102		1,185
Equity investments in privately-held companies	73		76
Cash, Cash Equivalents and Investments, Cost	3,795		2,860
Cash, Cash Equivalents and Investments, Gross Unrealized Gains	35		39
Cash, Cash Equivalents and Investments, Gross Unrealized Losses	2		3
Cash, Cash Equivalents and Investments, Estimated Fair Value	3,828		2,896
Total fixed income securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	977		1,046
Short-term and long-term investments, Gross Unrealized Gains	4		6
Short-term and long-term investments, Gross Unrealized Losses	2		3
Short-term and long-term investments, Estimated Fair Value	979		1,049
U.S. Treasury and agency securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	72		170
Short-term and long-term investments, Gross Unrealized Gains	0		0
Short-term and long-term investments, Gross Unrealized Losses	0		0
Short-term and long-term investments, Estimated Fair Value	72		170
Non-US government securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	15	[1]	11
Short-term and long-term investments, Gross Unrealized Gains	0	[1]	0
Short-term and long-term investments, Gross Unrealized Losses	0	[1]	0
Short-term and long-term investments, Estimated Fair Value	15	[1]	11
Municipal securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	390		379
Short-term and long-term investments, Gross Unrealized Gains	2		2
Short-term and long-term investments, Gross Unrealized Losses	0		0
Short-term and long-term investments, Estimated Fair Value	392		381
Commercial paper, corporate bonds and medium-term notes [Member]
Cash equivalents:
Short-term and long-term investments, Cost	228		218
Short-term and long-term investments, Gross Unrealized Gains	1		2
Short-term and long-term investments, Gross Unrealized Losses	0		1
Short-term and long-term investments, Estimated Fair Value	229		219
Asset-backed and mortgage-backed securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	272		268
Short-term and long-term investments, Gross Unrealized Gains	1		2
Short-term and long-term investments, Gross Unrealized Losses	2		2
Short-term and long-term investments, Estimated Fair Value	271		268
Publicly traded equity securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	19		27
Short-term and long-term investments, Gross Unrealized Gains	31		33
Short-term and long-term investments, Gross Unrealized Losses	0		0
Short-term and long-term investments, Estimated Fair Value	$ 50		$ 60

[1] Includes agency debt securities guaranteed by non-U.S. governments, which consist of Germany and Canada.