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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]        
Unrealized translation gain (loss), before tax $ 3 $ (140) $ (37) $ (82)
Unrealized translation gain (loss), tax 0 0 0 0
Unrealized translation gain (loss), net of tax 3 (140) (37) (82)
Adjustment of unrecognized prior service cost (credit), before tax 0 0 (7) 0
Adjustment of unrecognized prior service cost (credit), tax 0 0 1 0
Adjustment of unrecognized prior service cost (credit), net of tax 0 0 (6) 0
Unrealized gain on investment, before taxes [1] 0 4 0 10
Unrealized gain on investment, tax [1] 0 (2) 0 (3)
Unrealized gain on investment, net of tax [1] 0 2 0 7
Reclassification adjustment for gains included in net income, before tax 0 0 0 (4)
Reclassification adjustment for gains included in net income, tax 0 0 0 1
Reclassification adjustment for gains included in net income, net of tax 0 0 0 (3)
Total other comprehensive income (loss), before tax 3 (136) (44) (76)
Total other comprehensive income (loss), tax 0 (2) 1 (2)
Other comprehensive income (loss) $ 3 $ (138) $ (43) $ (78)
[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 AOCI. See Notes A and E for more information.