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Stock Incentive Plans (Tables) | 3 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Components of Stock-Based Compensation Expense Included in Continuing Operations | The components of Ashland’s pre-tax stock-based compensation expense included in continuing operations are as follows:
|  | Three months ended |
|  | December 31 |
(In millions) |  | 2019 (a) |  |  | 2018 (b) |
SARs |  | $ | 2 |  |  | $ | 2 |
Nonvested stock awards |  |  | 2 |  |  |  | 4 |
Performance share awards |  |  | 1 |  |  |  | — |
|  | $ | 5 |  |  | $ | 6 |
| (a) | Included $1 million of expense related to cash-settled nonvested restricted stock awards and zero related to cash-settled performance units during the three months ended December 31, 2019. |
| (b) | Included $1 million of expense related to cash-settled nonvested restricted stock awards and $2 million of income related to cash-settled performance units during the three months ended December 31, 2018. |

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