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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Jul. 25, 2022 | Jun. 30, 2022 | Feb. 03, 2021
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 | $ 142.62 | $ 191.47 | $ 199.90 |  |  |
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 |  |  |  | $ 922 |  |  |  |  |
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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- Definition Description of the nature of the settlement (cash or stock) of the accelerated share repurchases agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481138/505-30-25-5 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481138/505-30-25-5 + Details
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