Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Millions	Jul. 26, 2015		Oct. 26, 2014	Jul. 27, 2014	Oct. 27, 2013
Summary of Cash, Cash Equivalents and Investments
Cash	$ 422		$ 508
Cash equivalents:
Money market funds	2,152		2,494
Total Cash equivalents	2,152		2,494
Total Cash and Cash equivalents	2,574		3,002	$ 2,726	$ 1,711
Short-term and long-term investments, Cost	1,099		1,062
Short-term and long-term investments, Gross Unrealized Gains	30		35
Short-term and long-term investments, Gross Unrealized Losses	2		2
Short-term and long-term investments, Estimated Fair Value	1,127		1,095
Equity investments in privately-held companies	77		66
Cash, Cash Equivalents and Investments, Cost	3,673		4,064
Cash, Cash Equivalents and Investments, Gross Unrealized Gains	30		35
Cash, Cash Equivalents and Investments, Gross Unrealized Losses	2		2
Cash, Cash Equivalents and Investments, Estimated Fair Value	3,701		4,097
Total fixed income securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	994		977
Short-term and long-term investments, Gross Unrealized Gains	1		4
Short-term and long-term investments, Gross Unrealized Losses	2		2
Short-term and long-term investments, Estimated Fair Value	993		979
U.S. Treasury and agency securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	82		62
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	82		62
Non-US government securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	9	[1]	14
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	9	[1]	14
Municipal securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	390		391
Short-term and long-term investments, Gross Unrealized Gains	1		2
Short-term and long-term investments, Gross Unrealized Losses	0		0
Short-term and long-term investments, Estimated Fair Value	391		393
Commercial paper, corporate bonds and medium-term notes [Member]
Cash equivalents:
Short-term and long-term investments, Cost	239		223
Short-term and long-term investments, Gross Unrealized Gains	0		1
Short-term and long-term investments, Gross Unrealized Losses	1		0
Short-term and long-term investments, Estimated Fair Value	238		224
Asset-backed and mortgage-backed securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	274		287
Short-term and long-term investments, Gross Unrealized Gains	0		1
Short-term and long-term investments, Gross Unrealized Losses	1		2
Short-term and long-term investments, Estimated Fair Value	273		286
Publicly traded equity securities [Member]
Cash equivalents:
Short-term and long-term investments, Cost	28		19
Short-term and long-term investments, Gross Unrealized Gains	29		31
Short-term and long-term investments, Gross Unrealized Losses	0		0
Short-term and long-term investments, Estimated Fair Value	$ 57		$ 50

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