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Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
U.S. Pension Plans |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | $ 2,890 |  | $ 2,606
Defined Benefit Plan, Total Plan Assets |  | 3,165 | $ 3,293 |
U.S. Pension Plans | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 70 | 38 |
U.S. Pension Plans | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 652 | 692 |
U.S. Pension Plans | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 281 | 267 |
U.S. Pension Plans | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 649 | 655 |
U.S. Pension Plans | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 51 |  |
U.S. Pension Plans | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 270 | 345 |
U.S. Pension Plans | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 917 | 950 |
U.S. Pension Plans | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  |  | 2,947 |
Defined Benefit Plan, Investment Funds Measured At Net Asset Value | [1] | 275 | 346 |
Non-U.S. Pension |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 2,152 | 2,484 | 1,177
Defined Benefit Plan, Total Plan Assets |  | 2,181 | 2,536 |
Non-U.S. Pension | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 55 | 90 |
Non-U.S. Pension | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 242 | 317 |
Non-U.S. Pension | Mid Cap [Member] |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 2 |  |
Non-U.S. Pension | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 517 | 453 |
Non-U.S. Pension | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 13 | 19 |
Non-U.S. Pension | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 618 | 864 |
Non-U.S. Pension | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 569 | 561 |
Non-U.S. Pension | Hedge Funds |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 112 | 169 |
Non-U.S. Pension | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 24 | 11 |
Defined Benefit Plan, Investment Funds Measured At Net Asset Value | [1] | 29 | 52 |
Postretirement Benefits |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 177 | 196 | $ 194
Defined Benefit Plan, Total Plan Assets |  | 177 | 196 |
Postretirement Benefits | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 7 |
Postretirement Benefits | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 28 | 31 |
Postretirement Benefits | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 9 | 10 |
Postretirement Benefits | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 21 | 23 |
Postretirement Benefits | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 11 | 12 |
Postretirement Benefits | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 21 | 23 |
Postretirement Benefits | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 59 | 65 |
Postretirement Benefits | Commodities |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 15 | 12 |
Postretirement Benefits | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 10 | 13 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 2,345 |  |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 2 | 38 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 375 | 499 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 281 | 252 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 569 | 566 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 24 |  |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 243 | 280 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 851 | 633 |
Fair Value, Inputs, Level 1 | U.S. Pension Plans | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  |  | 2,268 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 513 | 608 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 45 | 59 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 18 | 22 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Mid Cap [Member] |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 2 |  |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 58 | 52 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 74 | 164 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 292 | 300 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Hedge Funds |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Non-U.S. Pension | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 24 | 11 |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Commodities |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 545 |  |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 68 | 0 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 277 | 193 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 15 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 80 | 89 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 27 |  |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 27 | 65 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 66 | 317 |
Significant Other Observable Inputs (Level 2) | U.S. Pension Plans | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  |  | 679 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 1,639 | 1,876 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 10 | 31 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 224 | 295 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Mid Cap [Member] |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 459 | 401 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 13 | 19 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 544 | 700 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 277 | 261 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Hedge Funds |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 112 | 169 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Pension | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 177 | 196 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 7 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 28 | 31 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 9 | 10 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 21 | 23 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 11 | 12 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 21 | 23 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 59 | 65 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 15 | 12 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 10 | 13 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  |  | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Mid Cap [Member] |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Hedge Funds |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Cash |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Large-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Small-Cap |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | International-Developed |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | International - Emerging |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Government |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Corporate/Other |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Commodities |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fair Value, Inputs, Level 3 | Postretirement Benefits | Real Estate |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Fair value of plan assets |  | $ 0 | $ 0 |
[1] | * The fair value of certain investments in real estate do not have a readily determinable fair value and requires the fund managers to independently arrive at fair value by calculating net asset value ("NAV") per share. In order to calculate NAV per share, the fund managers value the real estate investments using any one, or a combination of, the following methods: independent third party appraisals, discounted cash flow analysis of net cash flows projected to be generated by the investment and recent sales of comparable investments. Assumptions used to revalue the properties are updated every quarter. Due to the fact that the fund managers calculate NAV per share, the Company utilizes a practical expedient for measuring the fair value of its real-estate investments, as provided for under ASC 820, "Fair Value Measurement." In applying the practical expedient, the Company is not required to further adjust the NAV provided by the fund manager in order to determine the fair value of its investment as the NAV per share is calculated in a manner consistent with the measurement principles of ASC 946, "Financial Services - Investment Companies," and as of the Company's measurement date. The Company believes this is an appropriate methodology to obtain the fair value of these assets. For the component of the real estate portfolio under development, the investments are carried at cost until they are completed and valued by a third party appraiser. In accordance with ASU No. 2015-07, "Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)," investments for which fair value is measured using the net asset value per share practical expedient should be disclosed separate from the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of total plan assets to the amounts presented in the notes to consolidated financial statements.

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