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Stock Incentive Plans - Components of Stock-Based Compensation Expense Included in Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
[1]
Jun. 30, 2019
[2]
Jun. 30, 2020
[1]
Jun. 30, 2019
[2]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 5 $ 6 $ 12 $ 22
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 1 1 4 5
Nonvested Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 4 6 7 16
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation   $ (1) $ 1 $ 1
[1] Included $2 million and $1 million of expense related to cash-settled nonvested restricted stock awards during the three and nine months ended June 30, 2020 and zero related to cash-settled performance units during the three and nine months ended June 30, 2020
[2] 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.