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Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 174 | $ 177 | $ 196
Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 13 | 3 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 28 |
Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 21 |
Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 11 |
Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 21 |
Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 | 59 |
Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 15 |
Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 10 |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 13 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 13 | 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) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 161 | 177 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 3 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 28 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 21 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 11 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 21 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 | 59 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 15 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 10 |
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 |
UNITED STATES | Pension Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 3,046 | 3,165 | 3,293
UNITED STATES | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 70 |
UNITED STATES | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 430 | 652 |
UNITED STATES | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 282 | 281 |
UNITED STATES | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 411 | 649 |
UNITED STATES | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 94 | 51 |
UNITED STATES | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 333 | 270 |
UNITED STATES | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,183 | 917 |
UNITED STATES | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Defined Benefit Plan, Investment Funds Measured At Net Asset Value | 290 | 275 |
UNITED STATES | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,756 | 2,890 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 2 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 309 | 375 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 282 | 281 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 365 | 569 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 80 | 24 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 307 | 243 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,119 | 851 |
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,464 | 2,345 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 21 | 68 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 121 | 277 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 46 | 80 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 27 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 27 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 64 | 66 |
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 292 | 545 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Pension Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,117 | 2,181 | $ 2,536
Non-US [Member] | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 44 | 55 |
Non-US [Member] | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 235 | 242 |
Non-US [Member] | Pension Plan [Member] | Mid Cap [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 2 |
Non-US [Member] | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 319 | 517 |
Non-US [Member] | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 15 | 13 |
Non-US [Member] | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 830 | 618 |
Non-US [Member] | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 545 | 569 |
Non-US [Member] | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 82 | 112 |
Non-US [Member] | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 24 |
Defined Benefit Plan, Investment Funds Measured At Net Asset Value | 21 | 29 |
Non-US [Member] | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,096 | 2,152 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 43 | 45 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 24 | 18 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Mid Cap [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 2 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 59 | 58 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 80 | 74 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 301 | 292 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 24 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 534 | 513 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 10 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 211 | 224 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Mid Cap [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 260 | 459 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 13 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 750 | 544 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 244 | 277 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 82 | 112 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,562 | 1,639 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Mid Cap [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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