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Shareholders' Equity - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Nov. 30, 2025	Jan. 28, 2025	Nov. 03, 2021
Class of Stock [Line Items]
Share repurchase program, authorized, number of shares					10,000
Share repurchase program, number of additional shares authorized to be repurchased				10,000
Share Repurchase Program, Remaining Authorized, Number of Shares	12,000
Accelerated Share Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares, acquired	3,256	2,118
Share repurchase program, authorized, amount	$ 750	$ 500
Open Market Share Repurchases
Class of Stock [Line Items]
Treasury stock, shares, acquired	1,278
Share repurchase program, authorized, amount	$ 250
Open Market Share Repurchases | Subsequent Event
Class of Stock [Line Items]
Share repurchase program, authorized, amount			$ 250

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