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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial gain $ 0 $ 117
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 5
Interest cost 26 28
Expected return on plan assets (57) (59)
Net actuarial gain 0 117
Settlement gain 0 (8)
Net periodic benefit credit (27) (151)
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6 8
Interest cost 14 12
Expected return on plan assets (29) (23)
Net periodic benefit credit (9) (3)
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 1
Interest cost 2 1
Expected return on plan assets (2) (3)
Net periodic benefit credit $ 0 $ (1)