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Stock Incentive Plans - Components of Stock-Based Compensation Expense Included in Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
[1]
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 6 $ 11 [2]
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation 2 1 [2]
Nonvested Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 4 6 [2]
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation [2]   $ 4
[1] Included $1 million of expense related to cash-settled nonvested restricted stock awards and $2 million of income related to cash-settled performance units during the three months ended December 31, 2018.
[2] Included $2 million of expense related to cash-settled nonvested restricted stock awards and $2 million of expense related to cash-settled performance units during the three months ended December 31, 2017.