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Legal Matters (Tables) | 12 Months Ended
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Sep. 30, 2017
Loss Contingencies [Line Items] |
Schedule of Loss Contingencies by Contingency | The following table summarizes the activity related to accrued litigation.
| Fiscal 2017 |  | Fiscal 2016
| (in millions)
Balance at October 1 | $ | 981 |  |  | $ | 1,024 |
Provision for uncovered legal matters | 19 |  |  | 2 |
Accrual for VE territory covered litigation | 186 |  |  | 2 |
Payments on legal matters | (204 | ) |  | (47 | )
Balance at September 30 | $ | 982 |  |  | $ | 981 |
U.S. Covered Litigation |
Loss Contingencies [Line Items] |
Schedule of Loss Contingencies by Contingency | The following table summarizes the activity related to U.S. covered litigation.
| Fiscal 2017 |  | Fiscal 2016
| (in millions)
Balance at October 1 | $ | 978 |  |  | $ | 1,023 |
Payments on U.S. covered litigation | — |  |  | (45 | )
Balance at September 30 | $ | 978 |  |  | $ | 978 |
VE Territory Covered Litigation |
Loss Contingencies [Line Items] |
Schedule of Loss Contingencies by Contingency | The following table summarizes the activity related to VE territory covered litigation.
| Fiscal 2017 |  | Fiscal 2016
| (in millions)
Balance at October 1 | $ | 2 |  |  | $ | — |
Accrual for VE territory covered litigation | 186 |  |  | 2 |
Payments on VE territory covered litigation | (187 | ) |  | — |
Balance at September 30 | $ | 1 |  |  | $ | 2 |

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