v3.26.3
Business Segment Information - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2026
USD ($)
segment
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Segment Reporting [Line Items]      
Number of operating segments | segment 3    
Number of reportable segments | segment 3    
Assets $ 11,268 $ 11,219  
Sales 8,989 8,342 $ 8,264
U.S. Plans      
Segment Reporting [Line Items]      
Sales $ 5,381 $ 4,847 $ 4,612