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Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 163 | $ 174 | $ 177
Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 6 | 13 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 22 | 26 |
Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 8 |
Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 20 |
Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 | 55 |
Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 13 | 14 |
Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 9 |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 6 | 13 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 6 | 13 |
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 | 157 | 161 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 22 | 26 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 8 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 20 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 | 55 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 13 | 14 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 9 |
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 | 2,736 | 3,046 | 3,165
United States | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 | 23 |
United States | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 276 | 430 |
United States | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 232 | 282 |
United States | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 266 | 411 |
United States | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 52 | 94 |
United States | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 332 | 333 |
United States | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,266 | 1,183 |
United States | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 |  |
United States | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,534 | 2,756 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 24 | 2 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 276 | 309 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 232 | 282 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 233 | 365 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 42 | 80 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 47 | 307 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,266 | 1,119 |
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 55 |  |
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 | 2,175 | 2,464 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 31 | 21 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 121 |
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 | 33 | 46 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 10 | 14 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 285 | 26 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 64 |
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 |  |
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 | 359 | 292 |
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] | Defined Benefit Plan, Real Estate [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 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 |
United States | Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 202 | 290 |
Non-US [Member] | Pension Plan [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,098 | 2,117 | $ 2,181
Non-US [Member] | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 174 | 44 |
Non-US [Member] | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 214 | 235 |
Non-US [Member] | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 289 | 319 |
Non-US [Member] | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 12 | 15 |
Non-US [Member] | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 778 | 830 |
Non-US [Member] | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 517 | 545 |
Non-US [Member] | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 69 | 82 |
Non-US [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,084 | 2,096 |
Non-US [Member] | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 31 | 26 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 174 | 43 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 24 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 54 | 59 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 69 | 80 |
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 289 | 301 |
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 | 31 | 26 |
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 | 641 | 534 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 1 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 191 | 211 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 235 | 260 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 14 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 709 | 750 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 228 | 244 |
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Hedge Funds |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 69 | 82 |
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 | 1,443 | 1,562 |
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] | 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 |
Non-US [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 14 | $ 21 |

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