v3.26.1
Restructuring and Impairments - Schedule of Restructuring Accrual Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
2025 Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Restructuring charges $ 0   $ 0
2025 Restructuring Plan | Severance Costs      
Restructuring Reserve [Roll Forward]      
Beginning balance   $ 85  
Restructuring charges   34  
Cash payments   (80)  
Foreign currency movements   (1)  
Ending balance   38  
2024 Strategic Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance   30  
Restructuring charges   (1)  
Cash payments   (22)  
Ending balance   7  
2024 Strategic Restructuring Plan | Severance Costs      
Restructuring Reserve [Roll Forward]      
Beginning balance   23  
Restructuring charges   (1)  
Cash payments   (16)  
Ending balance   6  
2024 Strategic Restructuring Plan | Contract Termination Costs      
Restructuring Reserve [Roll Forward]      
Beginning balance   7  
Restructuring charges   0  
Cash payments   (6)  
Ending balance   $ 1