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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
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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 |

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