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Stock Incentive Plans - Components of Pretax Stock-Based Award (Net of Forfeitures) and Associated Income Tax Benefits (Details) - USD ($)
$ in Millions

12 Months Ended

Sep. 30, 2019

^[1]

Sep. 30, 2018

^[2]

Sep. 30, 2017

^[3]

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

Stock-based compensation

$ 26

$ 44

$ 28

Income tax benefit

6

14

11

Stock Appreciation Rights (SARs) [Member]

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

Stock-based compensation

7

7

5

Nonvested Stock Awards [Member]

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

Stock-based compensation

18

24

15

Performance Shares [Member]

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

Stock-based compensation

$ 1

$ 13

$ 8

[1]	The year ended September 30, 2019 included $5 million and zero of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.
[2]	The year ended September 30, 2018 included $9 million and $8 million of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.
[3]	The year ended September 30, 2017 included $5 million and $3 million of expense related to cash-settled nonvested restricted stock awards and cash-settled performance units, respectively.

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

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=116856206&loc=d3e5070-113901

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