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Stock Incentive Plans - Components of Pre-Tax Stock-Based Compensation Expense Included in Continuing Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2022 | [1] | Mar. 31, 2021 | [2] | Mar. 31, 2022 | [1] | Mar. 31, 2021 | [2]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ 5 | $ 5 | $ 11 | $ 10
Stock Appreciation Rights (SARs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | 0 | 0 | 0 | 1
Nonvested Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | 2 | 4 | 6 | 6
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ 3 | $ 1 | $ 5 | $ 3
[1] | Included zero and $2 million of expense related to cash-settled nonvested restricted stock awards during the three and six months ended March 31, 2022.
[2] | Included $1 million and $2 million of expense related to cash-settled nonvested restricted stock awards during the three and six months ended March 31, 2021.

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