Cash, Cash Equivalents and Investments (Cash, Cash Equivalents and Investments by Security Type) (Details) - USD ($) $ in Millions	Oct. 29, 2017	Oct. 30, 2016	Oct. 25, 2015	Oct. 26, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cash	$ 1,346	$ 1,103
Total Cash equivalents	3,664	2,303
Total Cash and Cash equivalents	5,010	3,406	$ 4,797	$ 3,002
Short-term and long-term investments, Cost	3,334	1,230
Short-term and long-term investments, Gross Unrealized Gains	79	46
Short-term and long-term investments, Gross Unrealized Losses	4	4
Short-term and long-term investments, Estimated Fair Value	3,409	1,272
Equity investments in privately-held companies	74	70
Cash, Cash Equivalents and Investments, Cost	8,344	4,636
Cash, Cash Equivalents and Investments, Gross Unrealized Gains	79	46
Cash, Cash Equivalents and Investments, Gross Unrealized Losses	4	4
Cash, Cash Equivalents and Investments, Estimated Fair Value	8,419	4,678
Total fixed income securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	3,238	1,134
Short-term and long-term investments, Gross Unrealized Gains	1	2
Short-term and long-term investments, Gross Unrealized Losses	3	1
Short-term and long-term investments, Estimated Fair Value	3,236	1,135
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	667	195
Short-term and long-term investments, Gross Unrealized Gains	0	0
Short-term and long-term investments, Gross Unrealized Losses	1	0
Short-term and long-term investments, Estimated Fair Value	666	195
Non-U.S. government securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	161	5
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	161	5
Municipal securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	1,007	408
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	1,007	408
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	1,024	273
Short-term and long-term investments, Gross Unrealized Gains	1	1
Short-term and long-term investments, Gross Unrealized Losses	1	0
Short-term and long-term investments, Estimated Fair Value	1,024	274
Asset-backed and mortgage-backed securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	379	253
Short-term and long-term investments, Gross Unrealized Gains	0	1
Short-term and long-term investments, Gross Unrealized Losses	1	1
Short-term and long-term investments, Estimated Fair Value	378	253
Publicly traded equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term and long-term investments, Cost	22	26
Short-term and long-term investments, Gross Unrealized Gains	78	44
Short-term and long-term investments, Gross Unrealized Losses	1	3
Short-term and long-term investments, Estimated Fair Value	99	67
Money market funds
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	2,658	1,889
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	15	10
Non-U.S. government securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	55	10
Municipal securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	341	253
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	$ 595	$ 141