Stock-Based Compensation Plans - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	$ 12	$ 10
Tax benefit	(3)	(4)
Total stock-based compensation expense, net of tax	9	6
Cash Settled - Liability Classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	1	1
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	2	3
Nonvested stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	9	5
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	$ 1	2
Affiliated Entity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax		$ 4

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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