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Restructuring Activities - Summary of Amount of Restructuring Severance Liabilities Related to Programs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Restructuring Cost And Reserve [Line Items]        
Utilization (cash paid) $ (2) $ (13) $ (6) $ (15)
2025 Restructuring Program        
Restructuring Cost And Reserve [Line Items]        
Beginning balance [1]     5  
Restructuring reserve     2  
Utilization (cash paid) (2) (5) (4) (6)
Ending balance [1] 3   3  
2023 Restructuring Program        
Restructuring Cost And Reserve [Line Items]        
Beginning balance [1]     1  
Restructuring reserve     1  
Utilization (cash paid) 0 $ (8) (2) $ (9)
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 March 31, 2026 and September 30, 2025.