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Employee Retirement Plans - Schedule of Fair Value of U.S. Pension Plan and VEBA Trust Assets (Details) - Pension Benefits - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 679 $ 657 $ 556
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 654 635  
Equity investments | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27 20  
Common Stock | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27 20  
Total common collective trust funds | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 613 598  
U.S. equity index investments | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 171 188  
Non-U.S. equity index investments | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 100 96  
Global equity index investments | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 29  
Bond index mutual funds | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 336 274  
Cash equivalents | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 11  
Alternative investments | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 14 $ 17