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Stock Incentive Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 6 [1] $ 11 [2]
Number of common shares for each converted performance share 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 $ 12  
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 3 months 18 days  
Stock-based compensation $ 2 [1] $ 1 [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 81,000 142,000
Total unrecognized compensation costs $ 13  
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 10 months 24 days  
Stock-based compensation $ 4 [1] $ 6 [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 200,000  
Stock-based compensation $ 1 2
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation costs $ 2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 30,000  
Stock-based compensation $ 1 $ 2
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 78,000 101,000
Total unrecognized compensation costs $ 18  
Unrecognized cost expected to be recognized over a weighted-average period (in years) 2 years 2 months 12 days  
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.