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Debt and Financing Arrangements Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs		$ 335	$ 409	$ 446
Bank fees and bond cost amortization		28	30	49
Gain (Loss) on Extinguishment of Debt	$ 60	60	0	0
Interest income		(61)	(13)	(11)
Net foreign exchange results for financing activities		(12)	(25)	(18)
Net financing charges		$ 350	$ 401	$ 466

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- Definition

Net financing charges includes interest expense, interest income, bank fees and amortization of debt issuance costs.

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Net foreign exchange results for financing activities.

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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Amount of the cost of borrowed funds accounted for as interest expense.

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