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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial (gain) loss     $ 1 $ 0
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 1 1
Interest cost 1 1 3 3
Expected return on plan assets (3) (3) (5) (5)
Net periodic benefit credit (1) (1) (1) (1)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 0 1
Interest cost 25 23 50 46
Expected return on plan assets (46) (50) (92) (100)
Net periodic benefit credit (21) (26) (42) (53)
Non-U.S. | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 6 11 11
Interest cost 12 14 26 28
Expected return on plan assets (25) (29) (52) (57)
Settlement (gain) loss 1 0 1 0
Net periodic benefit credit $ (6) $ (9) $ (14) $ (18)