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Cash Flows - Employer Contributions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Pension Benefits | U.S. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | $ 9 | $ 1
Expected employer contributions |  |
Expected employer contributions 2018 | 1 |
Expected benefit payments |  |
Expected benefit payments 2018 | 161 |
Expected benefit payments 2019 | 83 |
Expected benefit payments 2020 | 82 |
Expected benefit payments 2021 | 80 |
Expected benefit payments 2022 | 75 |
Expected benefit payments 2023-2027 | 323 |
Pension Benefits | Non-U.S. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | 5 | 102
Expected employer contributions |  |
Expected employer contributions 2018 | 5 |
Expected benefit payments |  |
Expected benefit payments 2018 | 5 |
Expected benefit payments 2019 | 5 |
Expected benefit payments 2020 | 5 |
Expected benefit payments 2021 | 5 |
Expected benefit payments 2022 | 5 |
Expected benefit payments 2023-2027 | 29 |
Other Postretirement Benefits | U.S. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | 3 | $ 3
Expected employer contributions |  |
Expected employer contributions 2018 | 2 |
Expected benefit payments |  |
Expected benefit payments 2018 | 2 |
Expected benefit payments 2019 | 2 |
Expected benefit payments 2020 | 2 |
Expected benefit payments 2021 | 1 |
Expected benefit payments 2022 | 1 |
Expected benefit payments 2023-2027 | $ 1 |

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