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Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 99 | $ 96 |
Allowance for uncollectible accounts - receivables | 1 | 1 | [1]
Loans and Leases Receivable, Allowance | 2 | 3 |
Reported Value Measurement |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 105 | $ 104 |
[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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