Cash, Cash Equivalents and Investments - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Jul. 26, 2020	Oct. 27, 2019	Jul. 28, 2019
Summary of Cash, Cash Equivalents and Investments
Cash	$ 1,010	$ 1,071
Total Cash equivalents	3,340	2,058
Total Cash and Cash equivalents	4,350	3,129	$ 3,014
Equity investments cost	121	113
Equity investments unrealized gain	55	50
Equity investments unrealized loss	9	6
Equity investments estimated fair value	167	157
Total short-term and long-term investments cost	1,867	2,134
Gross unrealized gains on short-term and long-term investments	87	64
Gross unrealized losses on short-term and long-term investments	10	6
Estimated fair value of short-term and long-term investments	1,944	2,192
Cash, cash equivalents and investments, cost	6,217	5,263
Cash, cash equivalents and investments, gross unrealized gains	87	64
Cash, cash equivalents and investments, gross unrealized losses	10	6
Cash, cash equivalents and investments, estimated fair value	6,294	5,321
Total fixed income securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	1,746	2,021
Gross unrealized gains on fixed income securities	32	14
Gross unrealized losses on fixed income securities	1	0
Estimated fair value of fixed income securities	1,777	2,035
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	365	336
Gross unrealized gains on fixed income securities	5	1
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	370	337
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	373	402
Gross unrealized gains on fixed income securities	8	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	381	406
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	488	642
Gross unrealized gains on fixed income securities	9	5
Gross unrealized losses on fixed income securities	1	0
Estimated fair value of fixed income securities	496	647
Asset-backed and mortgage-backed securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	520	631
Gross unrealized gains on fixed income securities	10	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	530	635
Publicly traded equity securities
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	11	8
Equity investments unrealized gain	36	40
Equity investments unrealized loss	3	3
Equity investments estimated fair value	44	45
Equity investments in privately-held companies
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	110	105
Equity investments unrealized gain	19	10
Equity investments unrealized loss	6	3
Equity investments estimated fair value	123	112
Money market funds
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	3,241	1,677
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	2
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	$ 97	377
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents		4
CANADA | 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