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Debt and Other Obligations (Tables) | 6 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at March 31, 2018, and September 30, 2017, consisted of the following:
Debt Outstanding
| At March 31, 2018 |  | At September 30, 2017
Short-term debt |  |  |
Short-term debt, net | $ | 1,998 |  |  | $ | 1,998 |
Current maturities of power bonds | 2,031 |  |  | 1,728 |
Current maturities of long-term debt of variable interest entities | 37 |  |  | 36 |
Current maturities of notes payable | 46 |  |  | 53 |
Total current debt outstanding, net | 4,112 |  |  | 3,815 |
Long-term debt |  |  |  |  |
Long-term power bonds(1) | 20,391 |  |  | 20,357 |
Long-term debt of variable interest entities | 1,156 |  |  | 1,175 |
Long-term notes payable | 47 |  |  | 69 |
Unamortized discounts, premiums, issue costs, and other | (160 | ) |  | (163 | )
Total long-term debt, net | 21,434 |  |  | 21,438 |
Total outstanding debt | $ | 25,546 |  |  | $ | 25,253 |
Note (1) Includes net exchange gain from currency transactions of $87 million and $125 million at March 31, 2018, and September 30, 2017, respectively.
Debt Securities Activity | The table below summarizes the long-term debt securities activity for the period from October 1, 2017, to March 31, 2018:
Debt Securities Activity
|  | Date |  | Amount(1) |  | Interest Rate
Issues |  |  |  |  |  |
2018 Series A(2) |  | March 2018 |  | $ | 1,000 |  |  | 2.25 | %
Discount on debt issues |  |  |  | (2 | ) |  |
Total long-term debt issuances |  |  |  | $ | 998 |  |  |
Redemptions/Maturities |  |  |  |  |  |
electronotes® |  | First Quarter 2018 |  | $ | 47 |  |  | 4.10 | %
electronotes® |  | Second Quarter 2018 |  | 2 |  |  | 3.50 | %
1997 Series E |  | First Quarter 2018 |  | 650 |  |  | 6.25 | %
2009 Series B |  | First Quarter 2018 |  | 1 |  |  | 3.77 | %
Total redemptions/maturities of power bonds |  |  |  | 700 |  |  |  |
Notes payable |  |  |  | 29 |  |  | 0.86 | %
Debt of variable interest entities |  |  |  | 18 |  |  | 4.31 | %
Total redemptions/maturities of debt |  |  |  | $ | 747 |  |  |  |
Notes (1) All redemptions were at 100 percent of par. (2) The 2018 Series A bonds were issued at 99.8 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 March 31, 2018
| Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
Maturity Date |  |  |  |  |  |  |
December 2019 | $ | 150 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 112 |
February 2022 | 500 |  |  | 500 |  |  | — |  |  | — |
June 2020 | 1,000 |  |  | 171 |  |  | — |  |  | 829 |
September 2020 | 1,000 |  |  | 212 |  |  | — |  |  | 788 |
Total | $ | 2,650 |  |  | $ | 921 |  |  | $ | — |  |  | $ | 1,729 |

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