|
Warranties (Details) (USD $)
In Millions |
6 Months Ended | |
|---|---|---|
|
Apr. 30, 2011
|
Apr. 30, 2010
|
|
| Warranties [Abstract] | Â | Â |
| Warranty terms | Our warranty terms typically extend for one year from the date of delivery | Â |
| Summary of standard warranty accrual activity [Rollforward] | Â | Â |
| Beginning balance | $ 45 | $ 28 |
| Accruals for warranties issued during the period | 33 | 26 |
| Changes in estimates | 3 | (2) |
| Settlements made during the period | (32) | (24) |
| Ending balance | $ 49 | $ 28 |