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Retirement Plans - Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 1,591 | $ 1,499 | $ 1,730
Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,525 | 1,388 | 1,433
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 161 | 144 | $ 144
Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 3 | 8 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 89 | 71 |
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 | 69 |  |
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 | 1,169 | 1,122 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,436 | 1,298 |
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 | 23 | 61 |
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 | 42 | 52 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 60 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 88 | 52 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 65 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 45 | 108 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 64 | 52 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 20 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 265 | 225 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 789 | 701 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 786 | 583 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 417 | 415 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 9 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 22 | 15 |
Fair Value, Inputs, Level 1, 2 and 3 | Postretirement Benefits | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 92 |  |
Quoted Prices in Active Markets (Level 1) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,144 | 1,061 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 380 | 393 |
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 | 42 | 52 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 60 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 65 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 45 | 108 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 10 | 12 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 8 | 20 |
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 | 265 | 225 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 26 | 40 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 784 | 583 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 282 | 271 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 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 | 3 |  |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 3 | 8 |
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 |  | 8 |
Significant Other Observable Inputs (Level 2) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 25 | 61 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,056 | 905 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 23 | 61 |
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 | 79 | 43 |
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 | 54 | 40 |
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 | 3 | 2 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 763 | 661 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 135 | 144 |
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 | 22 | 15 |
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 | 89 |  |
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 | 89 | 71 |
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 |  | 71 |
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 | 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 | Alternative | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 235 | 211 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 266 | 295 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 89 | 90 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Due to Broker | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ (79) | $ (129) |

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