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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)