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Stock-Based Compensation (Details) |  | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation |  | $ 15,000,000 | $ 20,000,000 | $ 47,000,000
Income tax benefit recognized for share-based compensation arrangements |  | $ 0 | $ 0 | $ 0
Conversion ratio (in shares) | 0.1 |  |  |
Stock options granted (in shares) | shares |  | 0 | 0 | 0
Option exercised in period, intrinsic value |  | $ 1,000,000 | $ 5,000,000 | $ 7,000,000
Payments made in conjunction with exercise of SARs |  | $ 2,000,000 |  |
Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Unrecognized compensation related to unvested share arrangements |  | $ 18,000,000 |  |
Recognition period for unrecognized compensation cost |  | 1 year 7 months 6 days |  |
Shares granted under the plan (in shares) | shares |  | 1,189,567 |  |
Performance shares (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation related to unvested share arrangements |  | $ 6,000,000 |  |
Recognition period for unrecognized compensation cost |  | 1 year 8 months 12 days |  |
Performance period |  | 3 years |  |
Shares granted under the plan (in shares) | shares |  | 497,335 |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  | 10 years |  |
Stock options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 2 years |  |
Stock options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Stock appreciation rights (SARs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted under the plan (in shares) | shares |  | 0 |  |
Payments made in conjunction with exercise of SARs |  | $ 1,000,000 | $ 1,000,000 | $ 3,000,000

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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