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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
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 5 [1] $ 6 [2] $ 12 [1] $ 22 [2]
Cash-settled Nonvested Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 2 $ 2 1 $ 5
Cash-settled Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 0   $ 0  
[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.