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Restructuring Charges (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]            
Restructuring charges           $ 97
Restructuring charges, net of tax           $ 73
Restructuring charges, per diluted share (in usd per share)           $ 0.64
Reversed accrual adjustment         $ 5  
Expected restructuring charges $ 92   $ 92      
Payments for restructuring 4 $ 10 21 $ 36    
Accruals for restructuring charges $ 6   $ 6   $ 27  
Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges           $ 92
Other Restructuring            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges           $ 5