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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2026 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Debt Instrument |  |  |  |  |  |  |
2018 | $ 1,028 |  |  |  |  |  |
2019 | 29 |  |  |  |  |  |
2020 | 1,022 |  |  |  |  |  |
2021 | 1,022 |  |  |  |  |  |
2022 | 1,370 |  |  |  |  |  |
Thereafter | 14,187 |  |  |  |  |  |
Total | 18,658 |  |  |  |  |  |
Short-term debt, net of discounts | 780 | $ 57 |  |  |  |  |
Short-term debt, net of discounts total | 780 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | 58 | $ 80 |  |  |  |  |
Net discount on sale of Bonds | 72 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized | 58 |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Short-term debt, net of discounts |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Power bonds |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt issuance costs | 43 |  |  |  |  |  |
Other long-term debt |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt issuance costs | $ 7 |  |  |  |  |  |

X
- 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://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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