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Stock Incentive Plans - Additional Information (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 26 [1] $ 44 [2] $ 28 [3]  
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unexercised SARs lapse expiration period 10 years      
Model to fair value share-based payment awards Black-Scholes option-pricing model      
Intrinsic value of stock appreciation rights and stock options exercised $ 12 15 14  
Tax benefit realized from the exercised stock appreciation rights and stock options 3 5 2  
Total grant date fair value of SARs and stock options that vested 8 $ 4 $ 8  
Total unrecognized compensation costs $ 6      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 7 months 6 days      
Aggregate intrinsic value of outstanding stock appreciation rights and stock options $ 42      
Aggregate intrinsic value of exercisable stock appreciation rights and stock options $ 38      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,102 2,263 [4] 2,261 1,511
Stock-based compensation $ 7 [1] $ 7 [2] $ 5 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Total unrecognized compensation costs $ 6      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 7 months 6 days      
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]        
Total unrecognized compensation costs $ 6      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 10 months 24 days      
Total fair value of nonvested stock awards that vested $ 10 $ 6 $ 19  
Granted (in shares) 96 192 92  
Stock-based compensation $ 18 [1] $ 24 [2] $ 15 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Total unrecognized compensation costs $ 6      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 10 months 24 days      
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      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       260
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 30      
Stock-based compensation $ 3 6 3  
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation costs 1      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Total unrecognized compensation costs $ 1      
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 95      
Stock-based compensation $ 5 $ 9 $ 5  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based payment award 3 years      
Model to fair value share-based payment awards Monte Carlo simulation valuation model      
Total unrecognized compensation costs $ 3      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 6 months      
Granted (in shares) 78 101 71  
Stock-based compensation $ 1 [1] $ 13 [2] $ 8 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Total unrecognized compensation costs $ 3      
Unrecognized cost expected to be recognized over a weighted-average period (in years) 1 year 6 months      
[1] The year ended September 30, 2019 included $5 million and zero of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.
[2] The year ended September 30, 2018 included $9 million and $8 million of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.
[3] The year ended September 30, 2017 included $5 million and $3 million of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.
[4] Exercise prices per share for SARs outstanding at September 30, 2019 ranged from $20.02 to $29.5 for 172 thousand shares, from $37.37 to $47.63 for 350 thousand shares, from $57.96 to $59.95 for 871 thousand shares, and from $62.33 to $82.34 for 709 thousand shares. The weighted-average remaining contractual life of outstanding SARs and stock options was 6.2 years and exercisable SARs and stock options was 5.4 years.