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Retirement Plans - Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 1,499 | $ 1,730 | $ 2,459
Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,388 | 1,433 | 2,344
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 144 | 144 | $ 172
Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 13 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 71 | 66 |
Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 65 |
Postretirement Benefits | Total Investments in the Fair Value Hierarchy |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 65 |  |
Postretirement Benefits | Total Investments in the Fair Value Hierarchy | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 79 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,333 | 1,574 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,298 | 1,336 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 61 | 40 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 52 | 150 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 60 | 160 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 52 | 45 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 65 | 175 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 108 | 139 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 52 | 43 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 39 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 3 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 225 | 217 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 701 | 650 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 583 | 804 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 415 | 418 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Alternative | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 211 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 15 | 18 |
Fair Value, Inputs, Level 1, 2 and 3 | Postretirement Benefits | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 79 |  |
Quoted Prices in Active Markets (Level 1) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,061 | 1,533 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 393 | 506 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Cash and Cash Equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 52 | 150 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 60 | 160 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 8 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 65 | 175 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 108 | 139 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 12 | 12 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 20 | 39 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 225 | 216 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 40 | 50 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 583 | 804 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 271 | 277 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Alternative | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 |  |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 13 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 13 |
Significant Other Observable Inputs (Level 2) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 272 | 41 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 905 | 830 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 61 | 40 |
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 | 43 | 37 |
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 | 40 | 31 |
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 | 3 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 1 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 661 | 600 |
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 | 144 | 141 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Alternative | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 211 |  |
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 Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 15 | 18 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 71 |  |
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 | 71 | 66 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 66 |
Significant Unobservable Inputs (Level 3) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Cash and Cash Equivalents | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Alternative | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Significant Unobservable Inputs (Level 3) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Real Estate |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  |  |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Total Investments in the Fair Value Hierarchy | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 295 | 322 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 90 | 97 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Due to Broker | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ (129) | $ (166) |

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