The amortized cost and fair value of marketable securities at November 3, 2019 and October 28, 2018 in millions of dollars follow: | | | | | | | | | | | | | | | | | | | Gross | | Gross | | | | | | | Amortized | | Unrealized | | Unrealized | | Fair | | | | Cost | | Gains | | Losses | | Value | | 2019 | | | | | | | | | | | | | | Equity fund | | | | | | | | | | | $ | 59 | | Total equity securities | | | | | | | | | | | | 59 | | U.S. government
debt securities | | $ | 128 | | $ | 4 | | $ | 1 | | | 131 | | Municipal debt securities | | | 57 | | | 3 | | | | | | 60 | | Corporate debt securities | | | 157 | | | 8 | | | | | | 165 | | International debt securities | | | 9 | | | | | | 3 | | | 6 | | Mortgage-backed securities* | | | 155 | | | 5 | | | | | | 160 | | Total debt securities | | | 506 | | | 20 | | | 4 | | | 522 | | Marketable securities | | $ | 506 | | $ | 20 | | $ | 4 | | $ | 581 | | 2018 | | | | | | | | | | | | | | Equity fund | | $ | 36 | | $ | 10 | | | | | $ | 46 | | U.S. government
debt securities | | | 113 | | | 1 | | $ | 3 | | | 111 | | Municipal debt securities | | | 49 | | | | | | 3 | | | 46 | | Corporate debt securities | | | 143 | | | 1 | | | 4 | | | 140 | | International debt securities | | | 11 | | | | | | 1 | | | 10 | | Mortgage-backed securities* | | | 144 | | | | | | 7 | | | 137 | | Marketable securities | | $ | 496 | | $ | 12 | | $ | 18 | | $ | 490 | |
* Primarily issued by U.S. government sponsored enterprises.
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