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Pension and Retirement Plans - Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ 1,448 | $ 1,591 | $ 1,499
Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,274 | 1,525 | 1,388
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 175 | 161 | $ 144
Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 3 |
Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 99 | 89 |
Postretirement Benefits | Total Investments in the Fair Value Hierarchy |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 75 | 69 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,044 | 1,169 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,250 | 1,436 |
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 | 43 | 23 |
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 | 18 | 42 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 19 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 185 | 88 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 23 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 49 | 45 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 91 | 64 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 8 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 7 | 3 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 197 | 265 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 685 | 789 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 706 | 786 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 260 | 417 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 4 | 11 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 22 |
Fair Value, Inputs, Level 1, 2 and 3 | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 100 | 92 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 999 | 1,144 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 212 | 380 |
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 | 18 | 42 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 19 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 5 | 9 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Small-Cap | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 19 | 23 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 49 | 45 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 5 | 10 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 11 | 8 |
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 | 197 | 265 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 10 | 26 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 704 | 784 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 170 | 282 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 4 | 11 |
Quoted Prices in Active Markets (Level 1) | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 3 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1 | 3 |
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 45 | 25 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 1,038 | 1,056 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and Cash Equivalents | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 43 | 23 |
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 | 180 | 79 |
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 | 86 | 54 |
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 | 7 | 3 |
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 | 675 | 763 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 2 | 2 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 90 | 135 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 22 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 99 | 89 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 99 | 89 |
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 |
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 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plan | Hedge Fund | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Cash and Cash Equivalents |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Large-Cap |  |  |
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 | 193 | 235 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 230 | 266 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | 24 | 89 |
Real Estate Investments Measured at Net Asset Value | Pension Plan | Due to Broker | United States |  |  |
Retirement Plans [Line Items] |  |  |
Fair value of plan assets | $ (19) | $ (79) |

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