New Accounting Pronouncement Debt Issuance Costs (Details) $ in Millions |
Oct. 31, 2015
USD ($)
|
|---|---|
| Adjustments for New Accounting Pronouncement [Member] | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Unamortized Debt Issuance Expense | $ 49 |