v3.26.1
Restructuring Activities - Summary of Amount of Restructuring Severance Liabilities Related to Programs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Restructuring Cost And Reserve [Line Items]        
Utilization (cash paid) $ (2) $ (4) $ (8) $ (18)
2025 Restructuring Program        
Restructuring Cost And Reserve [Line Items]        
Beginning balance [1]     5  
Restructuring expense     3  
Utilization (cash paid) (2) (2) (6) (7)
Ending balance [1] 2   2  
2023 Restructuring Program        
Restructuring Cost And Reserve [Line Items]        
Beginning balance [1]     1  
Restructuring expense     1  
Utilization (cash paid) 0 $ (2) (2) $ (11)
Ending balance [1] $ 0   $ 0  
[1] The restructuring severance liabilities associated with these programs is recorded within accrued expenses and other liabilities in the Condensed Consolidated Balance Sheets at June 30, 2026 and September 30, 2025.