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Debt (Tables) | 3 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Summary of Current and Long-term Debt | The following table summarizes Ashland’s current and long-term debt as of the dates reported in the Condensed Consolidated Balance Sheets.
(In millions) |  | December 31, 2018 |  |  | September 30, 2018 |
4.750% notes, due 2022 |  | $ | 1,083 |  |  | $ | 1,083 |
Term Loan B, due 2024 |  |  | 591 |  |  |  | 593 |
6.875% notes, due 2043 |  |  | 376 |  |  |  | 376 |
Term Loan A, due 2022 |  |  | 195 |  |  |  | 195 |
Accounts receivable securitizations |  |  | 195 |  |  |  | 195 |
6.50% junior subordinated notes, due 2029 |  |  | 53 |  |  |  | 52 |
Revolving credit facility |  |  | — |  |  |  | 25 |
Medium-term notes, due 2019, interest of 9.4% |  |  | 5 |  |  |  | 5 |
Other (a) |  |  | 6 |  |  |  | 5 |
Total debt |  |  | 2,504 |  |  |  | 2,529 |
Short-term debt (includes current portion of long-term debt) |  |  | (229 | ) |  |  | (254 | )
Long-term debt (less current portion) |  | $ | 2,275 |  |  | $ | 2,275 |
| (a) | Includes $20 million and $21 million of debt issuance cost discounts as of December 31, 2018 and September 30, 2018, respectively, in addition to a European short-term loan facility with an outstanding balance of $23 million at both December 31, 2018 and September 30, 2018. |

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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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