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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Unrealized translation gain (loss), before tax $ (31) $ 3
Unrealized translation gain (loss), tax 0 0
Unrealized translation gain (loss), net of tax (31) 3
Adjustment of unrecognized prior service cost (credit), before tax (7) 0
Adjustment of unrecognized prior service cost (credit), tax 1 0
Adjustment of unrecognized prior service cost (credit), net of tax (6) 0
Unrealized gain on investment, before taxes 0 [1] 11
Unrealized gain on investment, tax 0 [1] (2)
Unrealized gain on investment, net of tax 0 [1] 9
Reclassification adjustment for gains included in net income, before tax 0 (1)
Reclassification adjustment for gains included in net income, tax 0 0
Reclassification adjustment for gains included in net income, net of tax 0 (1)
Total other comprehensive income (loss), before tax (38) 13
Total other comprehensive income (loss), tax 1 (2)
Other comprehensive income (loss) $ (37) $ 11
[1] 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