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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, 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.