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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS- Components of net periodic costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018
Pension Plan [Member] | Domestic Plan [Member] |  |  |  |  |  |
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 |  |  | 10 | 8
Expected return on plan assets | (7) | (7) |  |  | (14) | (14)
Amortization: |  |  |  |  |  |
Actuarial losses | 0 | 0 |  |  | 0 | 0
Prior service credits | 0 | 0 |  |  | 0 | 0
Total net plan costs | (2) | (3) |  |  | (4) | (6)
Pension Plan [Member] | Foreign Plan [Member] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |
Service cost - benefits earned during the period | 4 | 4 |  |  | 10 | 10
Interest cost on benefit obligation | 3 | 3 |  |  | 6 | 6
Expected return on plan assets | (11) | (12) |  |  | (22) | (23)
Amortization: |  |  |  |  |  |
Actuarial losses | 9 | 8 |  |  | 18 | 15
Prior service credits | 0 | 0 |  |  | 0 | 0
Total net plan costs | 5 | 3 |  |  | 12 | 8
Curtailments and Settlements |  |  |  |  |  |
Settlement gain |  |  | $ 5 | $ 32 | 0 | 5
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member] |  |  |  |  |  |
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 |  |  | 1 | 2
Expected return on plan assets | (1) | (2) |  |  | (2) | (4)
Amortization: |  |  |  |  |  |
Actuarial losses | 1 | 2 |  |  | 2 | 4
Prior service credits | (2) | (2) |  |  | (4) | (4)
Total net plan costs | $ (1) | $ (1) |  |  | $ (3) | $ (2)

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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=108410482&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=112275985&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=108410482&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=112275985&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=108410482&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=108410482&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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + 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)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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