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Stock Incentive Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 12 [1] $ 8 [2] $ 32 [1] $ 21 [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 lapse expiration period     10 years 1 month  
Grants of share-based payment awards in period 0 0 470,000 422,000
Total unrecognized compensation costs $ 9   $ 9  
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)     2 years  
Stock-based compensation $ 2 [1] $ 2 [2] $ 5 [1] $ 4 [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 2,000 0 146,000 84,000
Total unrecognized compensation costs $ 8   $ 8  
Unrecognized cost expected to be recognized over a weighted-average period (in years)     2 years  
Stock-based compensation $ 6 [1] $ 4 [2] $ 17 [1] $ 11 [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 195,000   195,000  
Stock-based compensation $ 3 2 $ 7 4
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation costs $ 5   $ 5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 61,000   61,000  
Stock-based compensation $ 1 $ 1 $ 4 $ 1
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 0 101,000 56,000
Total unrecognized compensation costs $ 14   $ 14  
Unrecognized cost expected to be recognized over a weighted-average period (in years)     1 year 9 months 18 days  
Stock-based compensation $ 4 [1] $ 2 [2] $ 10 [1] $ 6 [2]
[1] 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.
[2] Included $2 million and $4 million of expense related to cash-settled nonvested restricted stock awards and $1 million and $3 million of expense related to cash-settled performance units during the three and nine months ended June 30, 2017, respectively.