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Debt and Financing Arrangements Short-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Short-term Debt [Line Items]
Short-term Debt	$ 8	$ 31
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.20%	3.40%
Commercial Paper	$ 0	$ 0
$2.5 billion facility expiring Dec 2024 [Domain]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,500
$500 million facility expiring Dec 2021 [Domain]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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