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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS (Tables) | 3 Months Ended
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Jan. 31, 2020
Defined Benefit Plan [Abstract] |
Schedule of net pension and post-retirement benefit costs | Components of net periodic costs. For the three months ended January 31, 2020 and 2019, our net pension and post retirement benefit costs were comprised of the following:
| Three Months Ended January 31,
| U.S. Pension Plans |  | Non-U.S. Pension Plans |  | U.S. Post Retirement Benefit Plans
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
| (in millions)
Service cost—benefits earned during the period | $ | — |  |  | $ | — |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
Interest cost on benefit obligation | 4 |  |  | 5 |  |  | 2 |  |  | 3 |  |  | 1 |  |  | — |
Expected return on plan assets | (8 | ) |  | (7 | ) |  | (12 | ) |  | (11 | ) |  | (1 | ) |  | (1 | )
Amortization: |  |  |  |  |  |  |  |  |  |  |
Actuarial losses | 1 |  |  | — |  |  | 12 |  |  | 9 |  |  | 1 |  |  | 1 |
Prior service credits | — |  |  | — |  |  | — |  |  | — |  |  | (2 | ) |  | (2 | )
Total net plan costs | $ | (3 | ) |  | $ | (2 | ) |  | $ | 9 |  |  | $ | 7 |  |  | $ | (1 | ) |  | $ | (2 | )
The service cost component is recorded in cost of sales and operating expenses in the condensed consolidated statement of operations. All other cost components are recorded in other income (expense), net in the condensed consolidated statement of operations.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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