|
Financial Instruments - Changes in fair value Level 3 assets and liabilities (Details) (Level 3, USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2015
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Fair Value as of September 30, 2014 |
|
$ 3 |
| Purchases, issuances, sales and settlements: |
|
|
| Purchases |
|
5 |
| Settlements |
|
(11) |
| Transfer in and / or out of Level 3 |
|
0 |
| Reclass between short-term and long-term |
|
1 |
| Fair Value as of March 31, 2015 |
4 |
4 |
| Short-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Fair Value as of September 30, 2014 |
|
2 |
| Purchases, issuances, sales and settlements: |
|
|
| Purchases |
|
5 |
| Settlements |
|
(10) |
| Transfer in and / or out of Level 3 |
|
0 |
| Reclass between short-term and long-term |
|
(1) |
| Fair Value as of March 31, 2015 |
2 |
2 |
| Long-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Fair Value as of September 30, 2014 |
|
1 |
| Purchases, issuances, sales and settlements: |
|
|
| Purchases |
|
0 |
| Settlements |
|
(1) |
| Transfer in and / or out of Level 3 |
|
0 |
| Reclass between short-term and long-term |
|
2 |
| Fair Value as of March 31, 2015 |
2 |
2 |
| Included in other income |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
|
3 |
| Included in other income | Short-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
|
3 |
| Included in other income | Long-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
|
0 |
| Included in cost of sales |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
3 |
3 |
| Included in cost of sales | Short-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
|
3 |
| Included in cost of sales | Long-term | Foreign currency option contracts |
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
| Total unrealized gains (losses): |
|
0 |
| Total realized gains (losses): |
|
$ 0 |