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Stock Incentive Plans - Additional Information (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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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.

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