Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Other Income (Expense) [Member]
Significant Accounting Policies [Line Items]
Investment income (loss)	$ 16			$ 16
Other Income (Expense) [Member] | Revaluation of Non-functional Currency [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	(2)			$ (42)
Other Income (Expense) [Member] | Single Devaluation Action [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses			$ (33)
BOPREAL Bonds [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	(2)
Purchase of bonds to settle foreign payables	$ 8	$ 30
Investment income (loss)		(8)
Proceeds from sale of bonds		$ 22