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Restructuring Activities - Summary of Severance Reserves and Facility Cost Reserves (Details)
$ in Millions
12 Months Ended
Sep. 30, 2019
USD ($)
Restructuring Cost And Reserve [Line Items]  
Beginning balance $ 43
Restructuring reserve 13
Utilization (cash paid) (42)
Ending balance 14
Severance Costs [Member]  
Restructuring Cost And Reserve [Line Items]  
Beginning balance 36
Restructuring reserve 6
Utilization (cash paid) (35)
Ending balance 7
Facility Costs [Member]  
Restructuring Cost And Reserve [Line Items]  
Beginning balance 7
Restructuring reserve 7
Utilization (cash paid) (7)
Ending balance $ 7