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Stock Incentive Plans - Components of Stock-Based Compensation Expense Included in Continuing Operations (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Jun. 30, 2020

^[1]

Jun. 30, 2019

^[2]

Jun. 30, 2020

^[1]

Jun. 30, 2019

^[2]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ 5

$ 6

$ 12

$ 22

Stock Appreciation Rights (SARs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

1

1

4

5

Nonvested Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ 4

6

7

16

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ (1)

$ 1

$ 1

[1]	Included $2 million and $1 million of expense related to cash-settled nonvested restricted stock awards during the three and nine months ended June 30, 2020 and zero related to cash-settled performance units during the three and nine months ended June 30, 2020
[2]	Included $2 million and $5 million of expense related to cash-settled nonvested restricted stock awards during the three and nine months ended June 30, 2019.

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: 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=116856206&loc=d3e5070-113901

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- Definition

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+ References

No definition available.

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