Employee Benefit Plans - Estimated Future Benefit Payments (Parenthetical) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan expected payment	$ 158	[1]

[1] ^{The $158 million expected payment for U.S. pension benefits in fiscal 2020 is in connection with the termination of the U.S. plan which is expected to be completed in fiscal 2020.}