v3.26.3
Restructuring Charges - Reconciliation of Accrued Liabilities Related to Restructuring Actions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 27 $ 70 $ 0
Restructuring Charges (Reversal) 25 (5) 97
Payments (22) (38) (27)
Restructuring reserve, ending balance 30 27 70
Severance Benefits      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 27 70 0
Restructuring Charges (Reversal) 25 (5) 92
Payments (22) (38) (22)
Restructuring reserve, ending balance 30 27 70
Other      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0 0
Restructuring Charges (Reversal) 0 0 5
Payments 0 0 (5)
Restructuring reserve, ending balance $ 0 $ 0 $ 0