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Stock Incentive Plans - Additional Information (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]
Number of common shares for each converted performance share 1   1  
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unexercised SARs generally lapse expiration period     10 years  
Grants of share-based payment awards in period     300,000 470,000
Total unrecognized compensation costs $ 8   $ 8  
Model to fair value share-based payment awards     Black-Scholes option-pricing model  
Unrecognized cost expected to be recognized over a weighted-average period (in years)     1 year 9 months 18 days  
Stock-based compensation $ 1 [1] $ 2 [2] $ 5 [1] $ 5 [2]
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     1 year  
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     3 years  
Nonvested Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants of share-based payment awards in period 1,000 2,000 95,000 146,000
Total unrecognized compensation costs $ 9   $ 9  
Unrecognized cost expected to be recognized over a weighted-average period (in years)     1 year 10 months 24 days  
Stock-based compensation $ 6 [1] $ 6 [2] $ 16 [1] $ 17 [2]
Nonvested Stock Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     1 year  
Nonvested Stock Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     5 years  
Cash-settled Nonvested Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     3 years  
Share-based compensation arrangement by share-based payment award, options, outstanding, number 113,000   113,000  
Stock-based compensation $ 2 3 $ 5 7
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation costs $ 1   $ 1  
Share-based compensation arrangement by share-based payment award, options, outstanding, number 30,000   30,000  
Stock-based compensation $ 1 $ 1 $ 2 $ 4
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award     3 years  
Grants of share-based payment awards in period 0 0 78,000 101,000
Total unrecognized compensation costs $ 5   $ 5  
Unrecognized cost expected to be recognized over a weighted-average period (in years)     1 year 7 months 6 days  
Stock-based compensation $ (1) [1] $ 4 [2] $ 1 [1] $ 10 [2]
[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.