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Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 2,459 | $ 2,706 | $ 2,736
Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,344 | 2,213 | 2,098
Pension Plan | Due to Broker | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | (77) | (80) |
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 172 | 153 | $ 163
Postretirement Benefits | Cash and cash equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 5 | 5 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 24 | 23 |
Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 7 |
Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 16 |
Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 12 | 10 |
Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 19 |
Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 56 | 53 |
Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 8 |
Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 17 | 12 |
Fair Value, Inputs, Level 1 | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,993 | 2,251 |
Fair Value, Inputs, Level 1 | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 615 | 665 |
Fair Value, Inputs, Level 1 | Pension Plan | Cash and cash equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 | Pension Plan | Cash and cash equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 151 | 178 |
Fair Value, Inputs, Level 1 | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 185 | 198 |
Fair Value, Inputs, Level 1 | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 23 |
Fair Value, Inputs, Level 1 | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 215 | 255 |
Fair Value, Inputs, Level 1 | Pension Plan | International-Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 182 | 220 |
Fair Value, Inputs, Level 1 | Pension Plan | International-Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 30 | 52 |
Fair Value, Inputs, Level 1 | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 34 | 33 |
Fair Value, Inputs, Level 1 | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 98 | 159 |
Fair Value, Inputs, Level 1 | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 77 | 64 |
Fair Value, Inputs, Level 1 | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,279 | 1,386 |
Fair Value, Inputs, Level 1 | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 320 | 321 |
Fair Value, Inputs, Level 1 | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 27 |
Fair Value, Inputs, Level 1 | Pension Plan | Hedge Funds | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 5 | 5 |
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash and cash equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 5 | 5 |
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 | Real Estate |  |  |
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 |
Significant Other Observable Inputs (Level 2) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 263 | 259 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,624 | 1,532 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and cash equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 75 | 36 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and cash equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 174 | 334 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | International-Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | International-Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 98 | 174 |
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 4 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 188 | 223 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,046 | 640 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 277 | 331 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Hedge Funds | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 27 | 49 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 167 | 148 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash and cash equivalents |  |  |
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 | 24 | 23 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 7 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 16 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 12 | 10 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 19 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 56 | 53 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 8 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 17 | 12 |
Fair Value, Inputs, Level 3 | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Cash and cash equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Cash and cash equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | International-Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | International-Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Pension Plan | Hedge Funds | Foreign Plan |  |  |
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 and cash equivalents |  |  |
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 | Real Estate |  |  |
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 Measured at Net Asset Value Per Share [Member] | Pension Plan | Real Estate | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 280 | 276 |
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 105 | 16 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,256 | 2,510 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2,239 | 2,197 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Cash and cash equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 75 | 36 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Cash and cash equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 151 | 178 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 185 | 198 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 197 | 357 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 215 | 255 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International-Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 182 | 220 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International-Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 128 | 226 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 34 | 33 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 4 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 286 | 382 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,123 | 704 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,279 | 1,386 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 597 | 652 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 14 | 27 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Hedge Funds | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 27 | $ 49 |

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