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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2026 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2019 | Sep. 30, 2018
Short-Term Debt, Gross [Line Items] |  |  |  |  |  |  |  |
Short-term debt, net of discounts | $ 57 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 922 | $ 1,217
Short-term Borrowings Gross | $ 57 |  |  |  |  |  |  |
Weighted average interest rate - discount notes | 0.06% |  |  |  |  |  | 2.15% | 2.05%
Foreign Currency Transaction Gain (Loss), Unrealized | $ 153 |  |  |  |  |  |  |
Foreign Currency Transaction Gain, before Tax | $ 73 |  |  |  |  |  |  |

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- Definition [Line Items] for Short-Term Debt, Gross [Table] + References No definition available. + Details
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- Definition Short-term Borrowings Gross + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details
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