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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial (gain) loss $ 59 $ (203) $ 17 $ (203)
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 1 1 1
Expected return on plan assets (2) (2) (4) (4)
Amortization of prior service credit (1) (1) (2) (2)
Net periodic benefit cost (credit) (2) (2) (5) (4)
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 11 11 21 22
Expected return on plan assets (41) (42) (82) (84)
Net actuarial (gain) loss 60 (203) 18 (203)
Settlement (gain) loss (2) 4 1 4
Net periodic benefit cost (credit) 32 (238) (42) (269)
Foreign Plan [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 6 11 13
Interest cost 10 8 20 16
Expected return on plan assets (21) (27) (42) (55)
Net actuarial (gain) loss (1) 0 (1) 0
Settlement (gain) loss (8) 0 (8) 0
Net periodic benefit cost (credit) $ 1 $ (13) $ (4) $ (26)