Schedule II Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Oct. 31, 2017 |
Oct. 31, 2016 |
Oct. 31, 2015 |
|
| Movement in valuation and qualifying accounts [Roll Forward] | |||
| Balance at Beginning of Period | $ 129 | $ 131 | $ 134 |
| Additions Charged to Costs, Expenses or Other Accounts | 14 | 22 | 6 |
| Deductions Credited to Expenses or Other Accounts | (5) | (24) | (9) |
| Balance at End of Period | $ 138 | $ 129 | $ 131 |