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Retirement Plans - Components and Assumptions of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 7 $ 7 $ 8
Interest cost 10 13 14
Expected return on plan assets (19) (18) (18)
Net actuarial (gain) loss 22 49 (24)
Settlement (gain) loss 1 2 0
Net periodic benefit cost (credit) $ 21 $ 53 $ (20)
Pension plan | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 3.34% 4.29% 3.85%
Expected return on plan assets 5.00% 5.00% 5.15%
Pension plan | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 1.85% 2.71% 2.62%
Expected return on plan assets 4.01% 4.08% 4.19%
Rate of compensation increase 3.66% 3.46% 3.53%
Postretirement      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlement (gain) loss     $ (15)