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Retirement and Post-Retirement Benefit Plans - Schedule of Defined Benefit Plans with Projected Benefit Obligations Exceeding Fair Value of Plan Assets (Details) - Defined Benefit Plans - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017
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U.S. |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Aggregate fair value of plan assets | $ 10,018 | $ 10,838
Aggregate projected benefit obligation | 11,167 | 12,266
Non-U.S. |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Aggregate fair value of plan assets | 800 | 750
Aggregate projected benefit obligation | $ 1,194 | $ 1,085

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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