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Accounts Receivable, Net Accounts Receivable, Net (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Power receivables	$ 1,683	$ 1,627
Other receivables	118	118
Accounts receivable, net	1,801	1,745
Allowance for uncollectible accounts - receivables	$ 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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