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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for uncollectible accounts | $ 1 | $ 1
Financing Receivable, after Allowance for Credit Loss | 97 | 99
Accounts and Financing Receivable, Allowance for Credit Loss | 2 | 2
Reported Value Measurement |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, after Allowance for Credit Loss | $ 104 | $ 105

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