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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, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 1 $ 0 $ 1
Interest cost 1 1 2 3
Expected return on plan assets (2) (3) (4) (5)
Amortization of prior service cost (credit) 0 0 (1) 0
Net periodic benefit credit (1) (1) (3) (1)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 19 25 37 50
Expected return on plan assets (46) (46) (90) (92)
Net periodic benefit credit (27) (21) (53) (42)
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 7 6 13 11
Interest cost 9 12 18 26
Expected return on plan assets (29) (25) (56) (52)
Amortization of prior service cost (credit) 1 0 1 0
Settlement (gain) loss 0 1 0 1
Net periodic benefit credit $ (12) $ (6) $ (24) $ (14)