Cash, Cash Equivalents and Investments (Cash, Cash Equivalents and Investments by Security Type) (Details) (USD $) In Millions, unless otherwise specified	Oct. 26, 2014		Oct. 27, 2013	Oct. 28, 2012	Oct. 30, 2011
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cash	$ 508		$ 611
Cash equivalents:
Money market funds	2,494		1,095
Municipal securities			5
Total Cash equivalents	2,494		1,100
Total Cash and Cash equivalents	3,002		1,711	1,392	5,960
Short-term and long-term investments:
Cost	1,062		1,149
Gross Unrealized Gains	35		39
Gross Unrealized Losses	2		3
Estimated Fair Value	1,095		1,185
Equity investments in privately-held companies	66		76
Total Cash, Cash equivalents and Investments
Cost	4,064		2,860
Gross Unrealized Gains	35		39
Gross Unrealized Losses	2		3
Estimated Fair Value	4,097		2,896
Total fixed income securities [Member]
Short-term and long-term investments:
Cost	977		1,046
Gross Unrealized Gains	4		6
Gross Unrealized Losses	2		3
Estimated Fair Value	979		1,049
U.S. Treasury and agency securities [Member]
Short-term and long-term investments:
Cost	62		170
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Estimated Fair Value	62		170
Non-US government securities [Member]
Short-term and long-term investments:
Cost	14	[1]	11
Gross Unrealized Gains	0	[1]	0
Gross Unrealized Losses	0	[1]	0
Estimated Fair Value	14	[1]	11
Municipal securities [Member]
Short-term and long-term investments:
Cost	391		379
Gross Unrealized Gains	2		2
Gross Unrealized Losses	0		0
Estimated Fair Value	393		381
Commercial paper, corporate bonds and medium-term notes [Member]
Short-term and long-term investments:
Cost	223		218
Gross Unrealized Gains	1		2
Gross Unrealized Losses	0		1
Estimated Fair Value	224		219
Asset-backed and mortgage-backed securities [Member]
Short-term and long-term investments:
Cost	287		268
Gross Unrealized Gains	1		2
Gross Unrealized Losses	2		2
Estimated Fair Value	286		268
Publicly traded equity securities [Member]
Short-term and long-term investments:
Cost	19		27
Gross Unrealized Gains	31		33
Gross Unrealized Losses	0		0
Estimated Fair Value	$ 50		$ 60

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