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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Unrealized translation gain (loss), before tax |  | $ (80) | $ (82) | $ 80
Unrealized translation gain (loss), tax |  | 0 | 0 | 1
Unrealized translation gain (loss), net of tax |  | (80) | (82) | 81
Amortization unrecognized prior service credit included in net income, before Tax |  |  |  | (7)
Amortization of unrecognized prior service credits included in net income, tax |  |  |  | 3
Amortization of unrecognized prior service credits included in net income, net of tax |  |  |  | (4)
Unrealized gain on investment securities before tax | [1] |  | 24 | 24
Unrealized gain on investment securities tax | [1] |  | (7) | (8)
Unrealized gain on investment securities net of tax | [1] |  | 17 | 16
Reclassification adjustment for gains included in net income, before tax |  |  | (6) | (2)
Reclassification adjustment for gains included in net income, tax |  |  | 2 | 1
Reclassification adjustment for gains included in net income, net of tax |  |  | (4) | (1)
Pension and postretirement obligation adjustment, before tax |  | (7) |  |
Pension and postretirement obligation adjustment, tax |  | 2 |  |
Pension and postretirement obligation adjustment, net of tax |  | (5) |  |
Total other comprehensive income (loss), before tax |  | (87) | (64) | 95
Total other comprehensive income (loss), tax |  | 2 | (5) | (3)
Other comprehensive income (loss) |  | $ (85) | $ (69) | $ 92
[1] | Due to the adoption of new accounting guidance in fiscal 2019, unrealized gains and losses on Ashland’s equity securities are now recognized in net income rather than other comprehensive income. See Notes A and G for more information.

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