v3.26.3
Basis of Presentation and Accounting Policies - Property (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
Property, Plant, and Equipment [Line Items]      
Capital expenditures in accounts payable or other current liabilities at year end $ 18 $ 56 $ 42
Minimum | Buildings and improvements      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Minimum | Machinery and equipment      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Minimum | Software Development      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Maximum | Buildings and improvements      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 40 years    
Maximum | Machinery and equipment      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 20 years    
Maximum | Software Development      
Property, Plant, and Equipment [Line Items]      
Property, plant and equipment, useful life 10 years