Cash, Cash Equivalents and Investments (Cash, Cash Equivalents and Investments by Security Type) (Details) - USD ($) $ in Millions	Oct. 27, 2019	Oct. 28, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cash	$ 1,071	$ 1,489
Total Cash equivalents	2,058	1,951
Total Cash and Cash equivalents	3,129	3,440
Estimated fair value of fixed income securities	4,093	3,982
Total equity investments, cost	113	106
Gross unrealized gains on publicly traded equity securities	50	25
Gross unrealized losses on publicly traded equity securities	6	4
Total equity securities, fair value	157	127
Equity investments in privately-held companies		89
Cost of short-term and long-term investments	2,134	2,150
Gross unrealized gains on short-term and long-term investments		25
Gross unrealized losses on short-term and long-term investments		17
Estimated fair value of short-term and long-term investments	2,192	2,158
Total short-term and long-term investments, cost	2,134
Total short-term and long-term investments, gross unrealized gains	64
Total short-term and long-term investments, gross unrealized losses	6
Total short-term and long-term investments	2,192
Cash, cash equivalents and investments, cost	5,263	5,590
Cash, cash equivalents and investments, gross unrealized gains	64	25
Cash, cash equivalents and investments, gross unrealized losses	6	17
Cash, cash equivalents and investments, estimated fair value	5,321	5,598
Fixed income securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	2,021	2,044
Gross unrealized gains on fixed income securities	14	0
Gross unrealized losses on fixed income securities	0	13
Estimated fair value of fixed income securities	2,035	2,031
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	336	335
Gross unrealized gains on fixed income securities	1	0
Gross unrealized losses on fixed income securities	0	2
Estimated fair value of fixed income securities	337	333
Municipal securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	402	399
Gross unrealized gains on fixed income securities	4	0
Gross unrealized losses on fixed income securities	0	4
Estimated fair value of fixed income securities	406	395
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	642	705
Gross unrealized gains on fixed income securities	5	0
Gross unrealized losses on fixed income securities	0	3
Estimated fair value of fixed income securities	647	702
Asset-backed and mortgage-backed securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	631	595
Gross unrealized gains on fixed income securities	4	0
Gross unrealized losses on fixed income securities	0	4
Estimated fair value of fixed income securities	635	591
Publicly Traded Equity Securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity investments, cost	8
Publicly traded equity securities, gross unrealized gains	40
Publicly traded equity securities, gross unrealized losses	3
Equity investments, fair value	45
Cost of publicly traded equity securities		17
Gross unrealized gains on publicly traded equity securities		25
Gross unrealized losses on publicly traded equity securities		4
Estimated fair value of publicly traded equity securities		38
Equity investments in privately-held companies
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity investments, cost	105
Publicly traded equity securities, gross unrealized gains	10
Publicly traded equity securities, gross unrealized losses	3
Equity investments, fair value	112
Money market funds
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	1,677	1,599
U.S. Treasury and agency securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	4
Commercial paper, corporate bonds and medium-term notes
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total Cash equivalents	377	352
Canada | Non-U.S. government securities*
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Cost of fixed income securities	10	10
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	$ 10	$ 10