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Summary of Significant Accounting Policies - Energy Prepayment Obligations and Discounts on Sales (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Energy Prepayment Obligations and Discounts on Sales |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 1 | $ 1 | [1]
[1] | Allowance for uncollectible accounts was less than $1 million at both September 30, 2024 and 2023, and therefore is not represented in the table above.

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