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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1 $ 2
Expected return on plan assets (2) (2)
Amortization of prior service credit (1) 0
Net periodic benefit credit (2) 0
UNITED STATES | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 18 25
Expected return on plan assets (44) (46)
Net periodic benefit credit (26) (21)
Foreign Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6 5
Interest cost 9 14
Expected return on plan assets (27) (27)
Net periodic benefit credit $ (12) $ (8)