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Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Portion at Other than Fair Value Measurement [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, after Allowance for Credit Loss | $ 104 | $ 105
Financing Receivable, after Allowance for Credit Loss | 96 | 96
Allowance for uncollectible accounts - receivables | 1 | 1
Loans and Leases Receivable, Allowance | $ 3 | $ 3

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