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Financial Instruments and Fair Value Measurements - Transfer of Financial Assets Accounted for as Sales (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value Disclosures [Abstract] |  |  |
Transfers of financial assets during the period. | $ 2,615 | $ 1,215 | $ 1,189
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized | $ 357 | $ 323 |

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- Definition Transfers of financial assets during the period. + References No definition available. + Details
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Balance Type: | debit
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- References No definition available. + Details
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- Definition Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4D + Details
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