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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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