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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS- Components of net periodic costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jan. 31, 2018 | Jan. 31, 2017 | Jul. 31, 2019 | Jul. 31, 2018
Pension Plan | United States |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |
Service cost - benefits earned during the period | $ 0 | $ 0 |  |  | $ 0 | $ 0
Interest cost on benefit obligation | 5 | 4 |  |  | 15 | 12
Expected return on plan assets | (7) | (7) |  |  | (21) | (21)
Amortization: |  |  |  |  |  |
Actuarial losses | 0 | 1 |  |  | 0 | 1
Prior service credits | 0 | 0 |  |  | 0 | 0
Total net plan costs | (2) | (2) |  |  | (6) | (8)
Pension Plan | Foreign Plan |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |
Service cost - benefits earned during the period | 6 | 6 |  |  | 16 | 16
Interest cost on benefit obligation | 3 | 3 |  |  | 9 | 9
Expected return on plan assets | (11) | (11) |  |  | (33) | (34)
Amortization: |  |  |  |  |  |
Actuarial losses | 9 | 7 |  |  | 27 | 22
Prior service credits | 0 | 0 |  |  | 0 | 0
Total net plan costs | 7 | 5 |  |  | 19 | 13
Curtailments and Settlements |  |  |  |  |  |
Settlement gain |  |  | $ 5 | $ 32 | 0 | 5
Other Postretirement Benefits Plan | United States |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |
Service cost - benefits earned during the period | 0 | 0 |  |  | 0 | 0
Interest cost on benefit obligation | 1 | 1 |  |  | 2 | 3
Expected return on plan assets | (1) | (2) |  |  | (3) | (6)
Amortization: |  |  |  |  |  |
Actuarial losses | 1 | 2 |  |  | 3 | 6
Prior service credits | (2) | (2) |  |  | (6) | (6)
Total net plan costs | $ (1) | $ (1) |  |  | $ (4) | $ (3)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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