Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Millions	Jan. 27, 2019	Oct. 28, 2018	Jan. 28, 2018	Oct. 29, 2017
Summary of Cash, Cash Equivalents and Investments
Cash	$ 1,016	$ 1,489
Total Cash equivalents	2,176	1,951
Total Cash and Cash equivalents	3,192	3,440	$ 6,799	$ 5,010
Equity investments cost	119
Equity investments unrealized gain	20
Equity investments unrealized loss	4
Equity investments estimated fair value	135
Total short-term and long-term investments cost	2,098
Gross unrealized gains on short-term and long-term investments	22
Gross unrealized losses on short-term and long-term investments	12
Estimated fair value of short-term and long-term investments	2,108
Gross unrealized gain on publicly traded equity securities		25
Gross unrealized loss on publicly traded equity securities		4
Equity investments in privately-held companies		89
Cost of equity investments		106
Estimated fair value of equity investments		127
Cost of short-term and long-term investments	2,098	2,150
Gross unrealized gain on short term and long term investments		25
Gross unrealized loss on short term and long term investments		17
Estimated fair value of short-term and long-term investments	2,108	2,158
Cash, cash equivalents and investments, cost	5,290	5,590
Cash, cash equivalents and investments, gross unrealized gains	22	25
Cash, cash equivalents and investments, gross unrealized losses	12	17
Cash, cash equivalents and investments, estimated fair value	5,300	5,598
Total fixed income securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	1,979	2,044
Gross unrealized gains on fixed income securities	2	0
Gross unrealized losses on fixed income securities	8	13
Estimated fair value of fixed income securities	1,973	2,031
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	375	335
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	0	2
Estimated fair value of fixed income securities	375	333
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	402	399
Gross unrealized gains on fixed income securities	1	0
Gross unrealized losses on fixed income securities	2	4
Estimated fair value of fixed income securities	401	395
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	628	705
Gross unrealized gains on fixed income securities	1	0
Gross unrealized losses on fixed income securities	3	3
Estimated fair value of fixed income securities	626	702
Asset-backed and mortgage-backed securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	565	595
Gross unrealized gains on fixed income securities	0	0
Gross unrealized losses on fixed income securities	3	4
Estimated fair value of fixed income securities	562	591
Publicly traded equity securities
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	15
Equity investments unrealized gain	20
Equity investments unrealized loss	4
Equity investments estimated fair value	31
Publicly traded equity securities cost		17
Gross unrealized gain on publicly traded equity securities		25
Gross unrealized loss on publicly traded equity securities		4
Publicly traded equity securities estimated fair value		38
Equity investments in privately-held companies
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	104
Equity investments estimated fair value	104
Money market funds
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	1,911	1,599
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	265	352
CANADA | Non-U.S. government securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	9
Gross unrealized gains on fixed income securities	0
Gross unrealized losses on fixed income securities	0
Estimated fair value of fixed income securities	$ 9
Canada and Germany | Non-U.S. government securities
Summary of Cash, Cash Equivalents and Investments
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