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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2026 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2018
Debt Instrument |  |  |  |  |  |  |  |
2018 |  | $ 1,901 |  |  |  |  |  |
2019 |  | 1,071 |  |  |  |  |  |
2020 |  | 69 |  |  |  |  |  |
2021 |  | 1,058 |  |  |  |  |  |
2022 |  | 1,059 |  |  |  |  |  |
Thereafter |  | 15,957 |  |  |  |  |  |
Total |  | 21,115 |  |  |  |  |  |
Short-term debt, net of discounts | $ 922 | 57 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,217
Short-term debt, net of discounts total |  | 57 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 191 | 80 |  |  |  |  |  |
Net discount on sale of Bonds |  | 77 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  | 153 |  |  |  |  |  |
Power bonds |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Debt issuance costs |  | 45 |  |  |  |  |  |
Other long-term debt |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 8 |  |  |  |  |  |

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- Definition Amount of outstanding short-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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