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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - 2021 Restructuring Plan
$ in Millions
12 Months Ended
Sep. 30, 2023
USD ($)
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance $ 276
Utilized—cash (130)
Utilized—noncash (41)
Restructuring reserve, ending balance 105
Employee Severance and Termination Benefits  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 204
Utilized—cash (111)
Utilized—noncash 0
Restructuring reserve, ending balance 93
Long-Lived Asset Impairments  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 38
Utilized—cash 0
Utilized—noncash (38)
Restructuring reserve, ending balance 0
Other  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 34
Utilized—cash (19)
Utilized—noncash (3)
Restructuring reserve, ending balance $ 12