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Debt and Financing Arrangements - Net Financing Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 216	$ 167	$ 142
Banking fees and debt issuance cost amortization	18	26	7
Interest income	(11)	(11)	(5)
Gain on partial extinguishment of debt	(3)	0	0
Net financing charges	$ 220	$ 182	$ 144

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section S99
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

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The net amount of operating interest income (expense).

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Amount of interest income earned from interest bearing assets classified as other.

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