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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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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.

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