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Debt (Tables) | 12 Months Ended
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Sep. 30, 2019
Debt Disclosure [Abstract] |
Summary of Current and Long-term Debt | The following table summarizes Ashland’s current and long-term debt at September 30, 2019 and 2018.
(In millions) |  | 2019 |  |  | 2018 |
4.750% notes, due 2022 |  | $ | 1,080 |  |  | $ | 1,083 |
Term loan B, due 2024 |  |  | — |  |  |  | 593 |
6.875% notes, due 2043 |  |  | 374 |  |  |  | 376 |
Term loan A, due 2022 |  |  | — |  |  |  | 195 |
Accounts receivable securitizations |  |  | 144 |  |  |  | 195 |
6.50% junior subordinated notes, due 2029 |  |  | 54 |  |  |  | 52 |
Revolving credit facility |  |  | — |  |  |  | 25 |
Medium-term notes, due 2019, interest of 9.35% at September 30, 2019 |  |  | — |  |  |  | 5 |
Other (a) |  |  | 15 |  |  |  | 5 |
Total debt |  |  | 1,667 |  |  |  | 2,529 |
Short-term debt (includes current portion of long-term debt) |  |  | (166 | ) |  |  | (254 | )
Long-term debt (less current portion and debt issuance costs) |  | $ | 1,501 |  |  | $ | 2,275 |
(a) | Other includes $12 million and $21 million of debt issuance costs as of September 30, 2019 and 2018, respectively. Additionally, as of September 30, 2019 and 2018, Other included a European short-term loan facility with an outstanding balances of $22 million and $23 million, respectively.
Summary of Net Interest and Other Expense (Income) | Net interest and other expense (income)
(In millions) |  | 2019 |  |  | 2018 |  |  | 2017 |
Interest expense (a) |  | $ | 114 |  |  | $ | 116 |  |  | $ | 227 |
Interest income |  |  | (2 | ) |  |  | (4 | ) |  |  | (4 | )
Investment securities income (b) |  |  | (17 | ) |  |  | (14 | ) |  |  | (11 | )
Other financing costs (c) |  |  | 4 |  |  |  | 4 |  |  |  | 17 |
|  | $ | 99 |  |  | $ | 102 |  |  | $ | 229 |
(a) | Includes $6 million, $1 million and $101 million of accelerated accretion and/or amortization for original issue discounts and debt issuance costs during 2019, 2018 and 2017, respectively.
(b) | Represents investment income related to the restricted investments discussed in Note G.
(c) | Includes costs of $16 million related to early redemption premium payments and bondholder consent fees for the 2022 and 2018 Senior Notes and a net gain of $5 million related to the repayment of the 2029 Notes during 2017.
Summary of Debt Issuance Cost Amortization | The following table details the debt issuance cost and original issue discount amortization included in interest expense during 2019, 2018 and 2017.
(In millions) |  | 2019 |  |  | 2018 |  |  | 2017 |
Normal amortization |  | $ | 7 |  |  | $ | 7 |  |  | $ | 8 |
Accelerated amortization (a) |  |  | 6 |  |  |  | 1 |  |  |  | 101 |
Total |  | $ | 13 |  |  | $ | 8 |  |  | $ | 109 |
(a) | Fiscal year 2017 includes $92 million of accelerated accretion of the recorded debt discount for the 2029 Notes, while the remaining amounts in each year related to the accelerated amortization of debt issuance costs.

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