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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Jul. 25, 2022	Feb. 03, 2021	Oct. 31, 2018
Common Stock Repurchase [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 400						$ 500
Treasury Stock Acquired, Average Cost Per Share		$ 194.91	$ 199.90	$ 191.47	$ 199.90	$ 125.10
Accelerated Share Repurchases, Cash or Stock Settlement	449,049	2.1 million	2.5 million
Adjustments To Additional Paid In Capital, Equity Forward Contract	$ 100
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 1,272
October Twenty Six Two Thousand Ten Program [Member]
Common Stock Repurchase [Line Items]
Stock Repurchase Program, Authorized Amount							$ 1,000		$ 5,400

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Adjustments To Additional Paid In Capital, Equity Forward Contract

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[Line Items] for Common Stock Repurchase [Table]

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Description of the nature of the settlement (cash or stock) of the accelerated share repurchases agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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