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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Apr. 30, 2021
Schedule of Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss) by component and related tax effects were as follows (in millions):
|  |  |  |  |  | Net defined benefit pension cost and post retirement plan costs |  |  |  |
Three Months Ended April 30, 2021 |  |  |  | Foreign currency translation |  | Prior service credits |  | Actuarial Losses |  | Unrealized gains (losses) on derivatives |  | Total
|  |  |  | (in millions)
As of January 31, 2021 |  |  |  | $ | (152) |  |  | $ | 125 |  |  | $ | (433) |  |  | $ | (9) |  |  | $ | (469) |
Other comprehensive income (loss) before reclassifications |  |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 2 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  |  | — |  |  | (1) |  |  | 16 |  |  | 6 |  |  | 21 |
Tax (expense) benefit |  |  |  | — |  |  | — |  |  | (4) |  |  | (2) |  |  | (6) |
Other comprehensive income (loss) |  |  |  | 2 |  |  | (1) |  |  | 12 |  |  | 4 |  |  | 17 |
As of April 30, 2021 |  |  |  | $ | (150) |  |  | $ | 124 |  |  | $ | (421) |  |  | $ | (5) |  |  | $ | (452) |
Six Months Ended April 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |
As of October 31, 2020 |  |  |  | $ | (194) |  |  | $ | 125 |  |  | $ | (442) |  |  | $ | (11) |  |  | $ | (522) |
Other comprehensive income (loss) before reclassifications |  |  |  | 44 |  |  | — |  |  | (3) |  |  | (6) |  |  | 35 |
Amounts reclassified out of accumulated other comprehensive income (loss) |  |  |  | — |  |  | (1) |  |  | 32 |  |  | 14 |  |  | 45 |
Tax (expense) benefit |  |  |  | — |  |  | — |  |  | (8) |  |  | (2) |  |  | (10) |
Other comprehensive income (loss) |  |  |  | 44 |  |  | (1) |  |  | 21 |  |  | 6 |  |  | 70 |
As of April 30, 2021 |  |  |  | $ | (150) |  |  | $ | 124 |  |  | $ | (421) |  |  | $ | (5) |  |  | $ | (452) |
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications out of accumulated other comprehensive income (loss) for the three and six months ended April 30, 2021 and 2020 were as follows (in millions):
Details about accumulated other comprehensive income (loss) components |  | Amounts Reclassified from other comprehensive income (loss) |  | Affected line item in statement of operations
|  | Three Months Ended |  | Six Months Ended |  |
|  | April 30, |  | April 30, |  |
|  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |
Unrealized gain (loss) on derivatives |  | $ | (6) |  |  | $ | 2 |  |  | $ | (14) |  |  | $ | 2 |  |  | Cost of products
|  | — |  |  | (1) |  |  | — |  |  | (1) |  |  | Interest expense
|  | (6) |  |  | 1 |  |  | (14) |  |  | 1 |  |  | Total before income tax
|  | 2 |  |  | — |  |  | 4 |  |  | — |  |  | Provision for income tax
|  | (4) |  |  | 1 |  |  | (10) |  |  | 1 |  |  | Total net of income tax
Net defined benefit pension cost and post retirement plan costs: |  |  |  |  |  |  |  |  |  |
Actuarial net loss |  | (16) |  |  | (14) |  |  | (32) |  |  | (28) |  |  |
Prior service benefit |  | 1 |  |  | 2 |  |  | 1 |  |  | 4 |  |  |
|  | (15) |  |  | (12) |  |  | (31) |  |  | (24) |  |  | Total before income tax
|  | 4 |  |  | 2 |  |  | 8 |  |  | 8 |  |  | Benefit for income tax
|  | (11) |  |  | (10) |  |  | (23) |  |  | (16) |  |  | Total net of income tax
Total reclassifications for the period |  | $ | (15) |  |  | $ | (9) |  |  | $ | (33) |  |  | $ | (15) |  |  |

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