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Debt and Other Obligations (Tables) | 3 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at December 31, 2020, and September 30, 2020, consisted of the following:
Debt Outstanding (in millions)
| At December 31, 2020 |  | At September 30, 2020
Short-term debt |  |  |
Short-term debt, net | $ | 112 |  |  | $ | 57 |
Current maturities of power bonds issued at par(1) | 1,802 |  |  | 1,787 |
Current maturities of long-term debt of VIEs issued at par | 41 |  |  | 41 |
Total current debt outstanding, net | 1,955 |  |  | 1,885 |
Long-term debt |  |  |
Long-term power bonds(2) | 18,108 |  |  | 18,078 |
Long-term debt of VIEs, net | 1,049 |  |  | 1,048 |
Unamortized discounts, premiums, issue costs, and other | (120) |  |  | (122) |
Total long-term debt, net | 19,037 |  |  | 19,004 |
Total debt outstanding | $ | 20,992 |  |  | $ | 20,889 |
Notes (1) Includes net exchange gain from currency transactions of $58 million and $73 million at December 31, 2020, and September 30, 2020, respectively. (2) Includes net exchange gain from currency transactions of $50 million and $80 million at December 31, 2020, and September 30, 2020, respec

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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