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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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