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Cash Flows - Actual Employer Contributions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
U.S. Pension Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | $ 1 | $ 16
Expected employer contributions |  |
Expected employer contributions 2017 | 9 |
Expected benefit payments |  |
Expected benefit payments 2017 | 165 |
Expected benefit payments 2018 | 88 |
Expected benefit payments 2019 | 85 |
Expected benefit payments 2020 | 84 |
Expected benefit payments 2021 | 81 |
Expected benefit payments 2022-2026 | 350 |
U.S. Other Postretirement Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | 3 | 3
Expected employer contributions |  |
Expected employer contributions 2017 | 3 |
Expected benefit payments |  |
Expected benefit payments 2017 | 3 |
Expected benefit payments 2018 | 3 |
Expected benefit payments 2019 | 2 |
Expected benefit payments 2020 | 2 |
Expected benefit payments 2021 | 2 |
Expected benefit payments 2022-2026 | 2 |
Non-U.S. Pension Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Actual employer contributions | 102 | $ 0
Expected employer contributions |  |
Expected employer contributions 2017 | 6 |
Expected benefit payments |  |
Expected benefit payments 2017 | 4 |
Expected benefit payments 2018 | 4 |
Expected benefit payments 2019 | 5 |
Expected benefit payments 2020 | 5 |
Expected benefit payments 2021 | 5 |
Expected benefit payments 2022-2026 | $ 27 |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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