Cash, Cash Equivalents and Investments (Cash, Cash Equivalents and Investments by Security Type) (Details) - USD ($) $ in Millions	Oct. 28, 2018	Oct. 29, 2017	Oct. 30, 2016	Oct. 25, 2015
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cash	$ 1,489	$ 1,346
Total Cash equivalents	1,951	3,664
Total Cash and Cash equivalents	3,440	5,010	$ 3,406	$ 4,797
Equity investments in privately-held companies	89	74
Cost of short-term and long-term investments	2,150	3,334
Gross unrealized gains on short-term and long-term investments	25	79
Gross unrealized losses on short-term and long-term investments	17	4
Estimated fair value of short-term and long-term investments	2,158	3,409
Cash, cash equivalents and investments, cost	5,590	8,344
Cash, cash equivalents and investments, gross unrealized gains	25	79
Cash, cash equivalents and investments, gross unrealized losses	17	4
Cash, cash equivalents and investments, estimated fair value	5,598	8,419
Money market funds
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	1,599	2,658
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents		15
Municipal securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents		341
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	352	595
Fixed income securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	2,044	3,238
Gross unrealized gains on fixed income securities	0	1
Gross unrealized losses on fixed income securities	13	3
Estimated fair value of fixed income securities	2,031	3,236
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	335	667
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	2	1
Estimated fair value of fixed income securities	333	666
Municipal securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	399	1,007
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	4	0
Estimated fair value of fixed income securities	395	1,007
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	705	1,024
Gross unrealized gains on fixed income securities	0	1
Gross unrealized losses on fixed income securities	3	1
Estimated fair value of fixed income securities	702	1,024
Asset-backed and mortgage-backed securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	595	379
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	4	1
Estimated fair value of fixed income securities	591	378
Publicly traded equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of publicly traded equity securities	17	22
Gross unrealized gains on publicly traded equity securities	25	78
Gross unrealized losses on publicly traded equity securities	4	1
Estimated fair value of publicly traded equity securities	38	99
Canada | Non-U.S. government securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	10
Gross unrealized gains on fixed income securities	0
Gross unrealized losses on fixed income securities	0
Estimated fair value of fixed income securities	$ 10
Canada and Germany | Non-U.S. government securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents		55
Canada and Germany | Non-U.S. government securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities		161
Gross unrealized gains on fixed income securities		0
Gross unrealized losses on fixed income securities		0
Estimated fair value of fixed income securities		$ 161