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Pension and Other Postretirement Benefits - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, personnel costs $ 140 $ 121 $ 93
Equity securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 53.00%    
Equity securities | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 13.00%    
Fixed income securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 46.00%    
Other security investments | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 1.00%    
Other security investments | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 38.00%    
Actual plan asset allocations 37.00%    
Equity funds | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 12.00%    
Interest and inflation hedging assets | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 50.00%    
Actual plan asset allocations 50.00%    
Minimum | Equity securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 35.00%    
Minimum | Fixed income securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 43.00%    
Maximum | Equity securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 65.00%    
Maximum | Fixed income securities | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 53.00%    
Maximum | Other security investments | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 4.00%