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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Other Income (Expense), Net
Interest income	$ 24	$ 23	$ 23
External services	12	19	18
Gains (losses) on investments	(1)	6	4
Miscellaneous	(6)	1	(1)
Total other income (expense), net	$ 29	$ 49	$ 44

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- Definition

Component of Other Income (Expense) [Line Items]

+ References

No definition available.

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- Definition

Revenue and expenses from external services included in Other income (expense), net on the Consolidated Statements of Operations.

+ References

No definition available.

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- Definition

Miscellaneous income and expense items included in the Other income (expense), net line on the Consolidated Statements of Operations.

+ References

No definition available.

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- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 9



-Subparagraph (c)-(e)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.7(c),9(a))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563

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- Definition

The net amount of nonoperating interest income (expense).

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.9)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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