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Share-based Compensation - Summary of RSU Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Aggregate Intrinsic Value
Stock price used to calculate aggregate intrinsic value (in dollars per share)	$ 177.65
Restricted Stock Units (RSUs)
Units
Beginning balance (in shares)	4,526,448
Granted (in shares)	3,967,313
Vested and earned (in shares)	(2,166,662)
Forfeited (in shares)	(532,779)
Ending balance (in shares)	5,794,320	4,526,448
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 188.16
Granted (in dollars per share)	204.73	$ 209.00	$ 183.61
Vested and earned (in dollars per share)	175.23
Forfeited (in dollars per share)	200.24
Ending balance (in dollars per share)	$ 203.23	$ 188.16
Weighted- Average Remaining Contractual Term (in years)
Outstanding at September 30, 2022	1 year 25 days
Aggregate Intrinsic Value
Outstanding at September 30, 2022	$ 1,029

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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