Discontinued Operations - Narrative (Details) - Separation and merger transactions - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2017	Apr. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 171	$ 470
Purchases of property, plant and equipment	$ 62	$ 147

Amount of capital expenditure attributable to discontinued operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.

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