Note 12 Unrecognized Stock Based Compensation Expense (Details) $ in Millions	6 Months Ended
Mar. 31, 2018 USD ($)
Restricted stock units
Unrecognized Compensation Cost and Weighted Average Period [Line Items]
Unrecognized compensation expense	$ 43
Weighted average period of recognition (years)	1 year 5 months 13 days
Performance Shares
Unrecognized Compensation Cost and Weighted Average Period [Line Items]
Unrecognized compensation expense	$ 20

Unrecognized Compensation Cost and Weighted Average Period [Line Items]

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Details

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