SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
12 Months Ended |
Apr. 30, 2016 |
Apr. 30, 2015 |
Apr. 30, 2016 |
Apr. 30, 2015 |
Oct. 31, 2015 |
| Share-based Compensation [Abstract] |
|
|
|
|
|
| Windfall tax benefit realized |
|
|
$ 0
|
$ 0
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
|
|
|
|
|
| Share-based compensation expense |
$ 14
|
$ 12
|
37
|
34
|
|
| Inventory |
|
|
|
|
|
| Share-based Compensation, Allocation and Classification in Financial Statements |
|
|
|
|
|
| Capitalized share-based compensation |
|
|
0
|
|
$ 0
|
| Cost of Products and Services |
|
|
|
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
|
|
|
|
|
| Share-based compensation expense |
3
|
2
|
9
|
7
|
|
| Research and Development Expense |
|
|
|
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
|
|
|
|
|
| Share-based compensation expense |
1
|
1
|
3
|
3
|
|
| Selling, General and Administrative Expenses |
|
|
|
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
|
|
|
|
|
| Share-based compensation expense |
$ 10
|
$ 9
|
$ 25
|
$ 24
|
|