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Stock Incentive Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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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.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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