Cash, Cash Equivalents and Investments - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Apr. 26, 2020	Oct. 27, 2019	Apr. 28, 2019
Summary of Cash, Cash Equivalents and Investments
Cash	$ 1,029	$ 1,071
Total Cash equivalents	4,252	2,058
Total Cash and Cash equivalents	5,281	3,129	$ 3,116
Equity investments cost	115	113
Equity investments unrealized gain	49	50
Equity investments unrealized loss	9	6
Equity investments estimated fair value	155	157
Total short-term and long-term investments cost	2,045	2,134
Gross unrealized gains on short-term and long-term investments	72	64
Gross unrealized losses on short-term and long-term investments	16	6
Estimated fair value of short-term and long-term investments	2,101	2,192
Cash, cash equivalents and investments, cost	7,326	5,263
Cash, cash equivalents and investments, gross unrealized gains	72	64
Cash, cash equivalents and investments, gross unrealized losses	16	6
Cash, cash equivalents and investments, estimated fair value	7,382	5,321
Total fixed income securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	1,930	2,021
Gross unrealized gains on fixed income securities	23	14
Gross unrealized losses on fixed income securities	7	0
Estimated fair value of fixed income securities	1,946	2,035
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	380	336
Gross unrealized gains on fixed income securities	6	1
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	386	337
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	397	402
Gross unrealized gains on fixed income securities	5	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	402	406
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	555	642
Gross unrealized gains on fixed income securities	5	5
Gross unrealized losses on fixed income securities	3	0
Estimated fair value of fixed income securities	557	647
Asset-backed and mortgage-backed securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	594	631
Gross unrealized gains on fixed income securities	7	4
Gross unrealized losses on fixed income securities	4	0
Estimated fair value of fixed income securities	597	635
Publicly traded equity securities
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	11	8
Equity investments unrealized gain	31	40
Equity investments unrealized loss	4	3
Equity investments estimated fair value	38	45
Equity investments in privately-held companies
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	104	105
Equity investments unrealized gain	18	10
Equity investments unrealized loss	5	3
Equity investments estimated fair value	117	112
Money market funds
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	4,231	1,677
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents		4
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	21	377
CANADA | Non-U.S. government securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	4	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	$ 4	$ 10