v3.26.3
Basis of Presentation and Accounting Policies - IEEPA Tariff Refund Claims And Related Customer Refunds (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reduction of sales $ 85 $ 0 $ 0
IEEPA Tariff Refund      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reduction to cost of sales 103    
Interest income 5    
Reduction of sales $ 85