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Cash, Cash Equivalents and Investments - Gain (Loss) on Equity Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 26, 2020 | Apr. 28, 2019 | Apr. 26, 2020 | Apr. 28, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Total gain (loss) on equity investments, net | $ (7) | $ 11 | $ (11) | $ 23
Publicly traded equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Unrealized gain | 3 | 7 | 5 | 13
Unrealized loss | (12) | (1) | (15) | (3)
Realized gain on sales | 0 | 1 | 0 | 2
Equity investments in privately-held companies |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Unrealized gain | 9 | 2 | 9 | 9
Unrealized loss | (2) | (2) | (3) | (3)
Realized gain on sales | 1 | 4 | 1 | 5
Realized loss on sales or impairment | $ (6) | $ 0 | $ (8) | $ 0

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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