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Stock Incentive Plans - Components of Stock-Based Compensation Expense Included in Continuing Operations (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ 6 | [1] | $ 12 | [2] | $ 22 | [1] | $ 32 | [2]
Cash-settled Nonvested Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | 2 |  | 3 |  | 5 |  | 7 |
Cash-settled Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ 2 |  | $ 2 |  | $ 2 |  | $ 5 |
[1] | Included $2 million and $5 million of expense related to cash-settled nonvested restricted stock awards during the three and nine months ended June 30, 2019 and $2 million of income related to cash-settled performance units during the three and nine months ended June 30, 2019.
[2] | Included $3 million and $7 million of expense related to cash-settled nonvested restricted stock awards and $2 million and $5 million of expense related to cash-settled performance units during the three and nine months ended June 30, 2018, respectively.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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