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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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