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INVESTMENTS | 12 Months Ended
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Oct. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
INVESTMENTS | 12. INVESTMENTS The net book value of investments as of October 31, 2020 and 2019 was as follows:
| October 31,
| 2020 |  | 2019
| (in millions)
Long-Term |  |  |
Equity investments | $ | 52 |  |  | $ | 37 |
Equity investments - other | 9 |  |  | 9 |
Total | $ | 61 |  |  | $ | 46 |
Equity investments are reported at fair value, with gains or losses resulting from changes in fair value recognized in earnings. Equity investments without readily determinable fair values that are measured at cost adjusted for observable changes in price or impairments are presented as "Equity investments - other" in the table above. All of our investments are subject to periodic impairment review. The impairment analysis requires significant judgment to identify events or circumstances that would likely have a significant adverse effect on the future value of the investment. There was no impairment recognized in 2020, 2019 and 2018. Realized gains and losses from the sale of investments are recorded in earnings. Net recognized gains (losses) on equity investments were as follows:
| Year Ended October 31,
| 2020 |  | 2019 |  | 2018
| (in millions)
Net realized gains on investments sold | $ | — |  |  | $ | 1 |  |  | $ | — |
Net unrealized gains on investments still held | 11 |  |  | 6 |  |  | — |
Prior to adoption of ASU 2016-01 effective November 1, 2018 using a modified retrospective approach, the unrealized gain or loss resulting from a change in the fair value of our equity investments was recognized in accumulated other comprehensive income (loss) and was a loss of $17 million for 2018. During the year ended October 31, 2019, we received proceeds of $7 million from the sale of an investment, classified as “Equity investments – other,” which was sold at cost.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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