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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial (gain) loss     $ (8) $ 0
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 1 1
Interest cost 2 1 5 4
Expected return on plan assets (2) (2) (7) (7)
Net periodic benefit credit 0 (1) (1) (2)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 1
Interest cost 25 23 75 69
Expected return on plan assets (46) (49) (138) (149)
Net periodic benefit credit (21) (26) (63) (79)
Non-U.S. | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 6 16 17
Interest cost 14 14 40 42
Expected return on plan assets (26) (29) (78) (86)
Settlement (gain) loss 0 0 1 0
Net periodic benefit credit $ (7) $ (9) $ (21) $ (27)