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 |