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Cash Flows - Employer Contributions (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value, assets, level 1 to level 2 transfers, amount $ 0  
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value, assets, level 1 to level 2 transfers, amount 0 $ 0
Pension Benefits | U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual employer contributions 1 9
Expected employer contributions    
Expected employer contributions 2019 1  
Expected benefit payments    
Expected benefit payments 2019 150  
Expected benefit payments 2020 73  
Expected benefit payments 2021 70  
Expected benefit payments 2022 67  
Expected benefit payments 2023 64  
Expected benefit payments 2024-2028 284  
Pension Benefits | Non-U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual employer contributions 11 $ 5
Expected employer contributions    
Expected employer contributions 2019 10  
Expected benefit payments    
Expected benefit payments 2019 5  
Expected benefit payments 2020 5  
Expected benefit payments 2021 5  
Expected benefit payments 2022 5  
Expected benefit payments 2023 5  
Expected benefit payments 2024-2028 $ 28