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Debt and Other Obligations (Tables) | 3 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at December 31, 2017, and September 30, 2017, consisted of the following:
Debt Outstanding
| At December 31, 2017 |  | At September 30, 2017
Short-term debt |  |  |
Short-term debt, net | $ | 2,721 |  |  | $ | 1,998 |
Current maturities of power bonds | 2,031 |  |  | 1,728 |
Current maturities of long-term debt of variable interest entities | 36 |  |  | 36 |
Current maturities of notes payable | 52 |  |  | 53 |
Total current debt outstanding, net | 4,840 |  |  | 3,815 |
Long-term debt |  |  |  |  |
Long-term power bonds(1) | 19,362 |  |  | 20,357 |
Long-term debt of variable interest entities | 1,175 |  |  | 1,175 |
Long-term notes payable | 68 |  |  | 69 |
Unamortized discounts, premiums, issue costs, and other | (159 | ) |  | (163 | )
Total long-term debt, net | 20,446 |  |  | 21,438 |
Total outstanding debt | $ | 25,286 |  |  | $ | 25,253 |
Note (1) Includes net exchange gain from currency transactions of $118 million at December 31, 2017, and $125 million at September 30, 2017.
Debt Securities Activity | The table below summarizes the long-term debt securities activity for the period from October 1, 2017, to December 31, 2017:
Debt Securities Activity
|  | Date |  | Amount(1) |  | Interest Rate
Redemptions/Maturities |  |  |  |  |  |
electronotes® |  | First Quarter 2018 |  | $ | 47 |  |  | 4.10 | %
1997 Series E |  | December 2017 |  | 650 |  |  | 6.25 | %
2009 Series B |  | December 2017 |  | 1 |  |  | 3.77 | %
Total redemptions/maturities of power bonds |  |  |  | 698 |  |  |  |
Notes payable |  | November 2017 |  | 2 |  |  | 1.64 | %
Total redemptions/maturities of debt |  |  |  | $ | 700 |  |  |  |
Note (1) All redemptions were at 100 percent of par.
Credit Facility Agreements |
Summary of Long-Term Credit Facilities | The following table provides additional information regarding TVA's funding available under the four long-term credit facilities:
Summary of Long-Term Credit Facilities At December 31, 2017
Maturity Date | Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
December 2019 | $ | 150 |  |  | $ | 37 |  |  | $ | — |  |  | $ | 113 |
February 2021 | 500 |  |  | 500 |  |  | — |  |  | — |
June 2020 | 1,000 |  |  | 268 |  |  | — |  |  | 732 |
September 2020 | 1,000 |  |  | 224 |  |  | — |  |  | 776 |
Total | $ | 2,650 |  |  | $ | 1,029 |  |  | $ | — |  |  | $ | 1,621 |

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