Accounts Payable, Accrued Liabilities and Other Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions		Sep. 30, 2020	Sep. 30, 2019
Payables And Accruals [Abstract]
Accounts payable		$ 316	$ 390
Accrued employee compensation		46	51
Accrued legal expenses	[1]	38	6
Other accrued liabilities		88	90
Total		$ 488	$ 537

[1] ^{Accrued legal expenses as of September 30, 2020 includes the $32.6 million accrued liability payable under the settlement agreement discussed in Note U, which was paid in the first quarter of fiscal 2021.}