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Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 81	$ 106	$ 269	$ 307
Banking fees and bond cost amortization	7	8	20	23
Loss on debt extinguishment	60	0	60	0
Interest income	(28)	(5)	(41)	(13)
Net foreign exchange results for financing activities	(1)	(14)	(6)	(13)
Net financing charges	$ 119	$ 95	$ 302	$ 304

X

- Definition

The total amount of banking fees and bond cost amortization charged to income in the period through the net financing charges line item in the statement of income.

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

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- Definition

Net foreign exchange results for financing activities.

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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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