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Equity Items (Tables) | 3 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | Components of other comprehensive income (loss) recorded in the Statements of Consolidated Comprehensive Income (Loss) are presented below, before tax and net of tax effects.
| 2018 |  |  | 2017 |
(In millions) | Before tax |  |  | Tax (expense) benefit |  |  | Net of tax |  |  | Before tax |  |  | Tax (expense) benefit |  |  | Net of tax |
Three months ended December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized translation gain (loss) | $ | (31 | ) |  | $ | — |  |  | $ | (31 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Pension and postretirement obligation adjustment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of unrecognized prior service costs |  | (7 | ) |  |  | 1 |  |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net change in investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains during periods (a) |  | — |  |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | (2 | ) |  |  | 9 |
Reclassification adjustment for gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
included in net income |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Total other comprehensive income (loss) | $ | (38 | ) |  | $ | 1 |  |  | $ | (37 | ) |  | $ | 13 |  |  | $ | (2 | ) |  | $ | 11 |
| (a) | Due to the adoption of new accounting guidance in the current quarter, unrealized gains and losses on Ashland’s equity securities are now recognized in net income rather than AOCI. See Notes A and E for more information. |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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