Cash, Cash Equivalents and Investments (Cash, Cash Equivalents and Investments by Security Type) (Details) - USD ($) $ in Millions		Oct. 25, 2015		Oct. 26, 2014	Oct. 27, 2013	Oct. 28, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cash		$ 1,010		$ 508
Cash equivalents:
Money market funds		3,272		2,494
Non-U.S. government securities	[1]	60
Municipal securities		73
Commercial paper, corporate bonds and medium-term notes		382
Total Cash equivalents		3,787		2,494
Total Cash and Cash equivalents		4,797		3,002	$ 1,711	$ 1,392
Short-term and long-term investments:
Cost		1,095		1,062
Gross Unrealized Gains		19		35
Gross Unrealized Losses		0		2
Estimated Fair Value		1,114		1,095
Equity investments in privately-held companies		78		66
Total Cash, Cash equivalents and Investments
Cost		5,892		4,064
Gross Unrealized Gains		19		35
Gross Unrealized Losses		0		2
Estimated Fair Value		5,911		4,097
Total fixed income securities [Member]
Short-term and long-term investments:
Cost		989		977
Gross Unrealized Gains		2		4
Gross Unrealized Losses		0		2
Estimated Fair Value		991		979
U.S. Treasury and agency securities
Short-term and long-term investments:
Cost		84		62
Gross Unrealized Gains		0		0
Gross Unrealized Losses		0		0
Estimated Fair Value		84		62
Non-U.S. government securities
Short-term and long-term investments:
Cost		9	[1]	14
Gross Unrealized Gains		0	[1]	0
Gross Unrealized Losses		0	[1]	0
Estimated Fair Value		9	[1]	14
Municipal securities
Short-term and long-term investments:
Cost		384		391
Gross Unrealized Gains		2		2
Gross Unrealized Losses		0		0
Estimated Fair Value		386		393
Commercial paper, corporate bonds and medium-term notes
Short-term and long-term investments:
Cost		250		223
Gross Unrealized Gains		0		1
Gross Unrealized Losses		0		0
Estimated Fair Value		250		224
Asset-backed and mortgage-backed securities
Short-term and long-term investments:
Cost		262		287
Gross Unrealized Gains		0		1
Gross Unrealized Losses		0		2
Estimated Fair Value		262		286
Publicly traded equity securities
Short-term and long-term investments:
Cost		28		19
Gross Unrealized Gains		17		31
Gross Unrealized Losses		0		0
Estimated Fair Value		$ 45		$ 50

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