Cash, Cash Equivalents and Investments - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Summary of Cash, Cash Equivalents and Investments
Cash	$ 1,136	$ 1,071
Total Cash equivalents	4,215	2,058
Total Cash and Cash equivalents	5,351	3,129	$ 3,440
Cost of fixed income securities	1,847
Estimated fair value of fixed income securities	6,071	4,093
Equity investments cost	132	113
Equity investments unrealized gain	61	50
Publicly traded equity securities, gross unrealized losses	9	6
Equity investments estimated fair value	184	157
Total short-term and long-term investments cost	1,847	2,134
Total short-term and long-term investments, gross unrealized gains	88	64
Total short-term and long-term investments, gross unrealized losses	10	6
Total short-term and long-term investments	1,925	2,192
Cash, cash equivalents and investments, cost	7,198	5,263
Cash, cash equivalents and investments, gross unrealized gains	88	64
Cash, cash equivalents and investments, gross unrealized losses	10	6
Cash, cash equivalents and investments, estimated fair value	7,276	5,321
Total fixed income securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	1,715	2,021
Gross unrealized gains on fixed income securities	27	14
Gross unrealized losses on fixed income securities	1	0
Estimated fair value of fixed income securities	1,741	2,035
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	394	336
Gross unrealized gains on fixed income securities	4	1
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	398	337
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	359	402
Gross unrealized gains on fixed income securities	6	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	365	406
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	492	642
Gross unrealized gains on fixed income securities	8	5
Gross unrealized losses on fixed income securities	1	0
Estimated fair value of fixed income securities	499	647
Asset-backed and mortgage-backed securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	470	631
Gross unrealized gains on fixed income securities	9	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	479	635
Publicly traded equity securities
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	11	8
Equity investments unrealized gain	36	40
Publicly traded equity securities, gross unrealized losses	2	3
Equity investments estimated fair value	45	45
Equity investments in privately-held companies
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	121	105
Equity investments unrealized gain	25	10
Publicly traded equity securities, gross unrealized losses	7	3
Equity investments estimated fair value	139	112
Money market funds
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	4,209	1,677
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	$ 6
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents		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